CSC111 Programs Created in Class 2018

D. Thiebaut (talk) 12:30, 31 January 2018 (EST)

---

1/30/18

# wedWeek1.py
# D. Thiebaut
# Demo program week 1


# variables
age = 20
year = 2018

# compute year born
print( year - age )


# example of for loop
for name in [ "smith", 23, 3.14159, "hello" ]:
    print( name )

"""
challenge: print the following lines
***
Mae
*****
Alice
*******
Felicia
"""

for name in [ "Mae", "Alice", "Felicia" ]:
    print( '*' * len( name ) )
    print( name )


"""
new challenge: print the following lines
*
Mae
********
Alice
****
Felicia
**
"""

for name in [ "*", "Mae", "********", "Alice", "****", "Felicia", "**" ]:
    print( name )

02/05/18

Table of Fahrenheit to Celsius conversion

# 020518.py
# D. Thiebaut
#
# print table of temperatures
# start at 100 F down to -30 F
# in steps of 10
# using the formula: Celsius = (Farhenheit - 32 ) * 5 / 9

# print the header 
print( "Fahrenheit --> Celsius" )

# display the table of temperatures
# ranging from 100 down to -30F.
for fTemp in range( 100, -31, -10 ):
    cTemp = ( fTemp - 32 ) * 5 / 9
    print( fTemp, '-->', cTemp )

Problem: get user name and grade and display user information and grade as a bar graph.

# barGraph.py
# D. Thiebaut
# this program prompts the user for her information
# and grade and displays a bar-graph.
#
#First name?  Dominique
#Last name?   Thiebaut
#Id?          990123456
#Final grade? 90
#
#+———————————————————————————————————-———————————-+
#|Dominique Thiebaut                    990123456 |
#+———————————————————————————————————-———————————-+
#      00...10...20...30...40...50...60...70...80...90...100
#grade: #############################################
#class: ########################################
#
#

# input section
fName = input( "First name?  " )
lName = input( "Last name?   " )
Id    = input( "Id?          " )
final = input( "Final grade? " )

# output section
print( fName, lName, Id )
bar = "+———————————————————————————————————-———————————-+"
barLen = len( bar )
print( "barLen =", barLen )
nameIdLen = len( fName )+1+len( lName ) + len( Id )+1
print( "nameIdLen =", nameIdLen )

print( bar )
print( "|", fName, lName, ' '*(barLen-nameIdLen), Id, '|' )
print( bar )

2/7/18

We didn't have time to cover this problem, because of the snow storm... But it simply displays an 8 by 8 chessboard using hash tags.

# chessBoard.py
# D. Thiebaut
# displays an 8x8 chessboard, as shown below.
"""
###   ###   ###   ###   
###   ###   ###   ###   
###   ###   ###   ###   
   ###   ###   ###   ###
   ###   ###   ###   ###
   ###   ###   ###   ###
###   ###   ###   ###   
###   ###   ###   ###   
###   ###   ###   ###   
   ###   ###   ###   ###
   ###   ###   ###   ###
   ###   ###   ###   ###
###   ###   ###   ###   
###   ###   ###   ###   
###   ###   ###   ###   
   ###   ###   ###   ###
   ###   ###   ###   ###
   ###   ###   ###   ###
###   ###   ###   ###   
###   ###   ###   ###   
###   ###   ###   ###   
   ###   ###   ###   ###
   ###   ###   ###   ###
   ###   ###   ###   ###
"""
numRows = eval( input( "Number of rows?    " ) )
numCols = eval( input( "Number of columns? " ) )
white="   "
black="###"

bar1 = ""
bar2 = ""
for i in range( numCols//2 ):
    bar1 = bar1 + white + black
    bar2 = bar2 + black + white

for i in range( numRows//2 ):
    # display 2 lines of squares
    # alternating the colors
    # 5    ###   ###   ###   ###
    #     ###   ###   ###   ###
    #     ###   ###   ###   ###
    #  ###   ###   ###   ###   
    #  ###   ###   ###   ###   
    #  ###   ###   ###   ###   
    for n in range( 3 ):
        print( bar1 )
    for n in range( 3 ):
        print( bar2 )

2/9/18

# barGraph.py
# D. Thiebaut
# this program prompts the user for her information
# and grade and displays a bar-graph.
#
#First name?  Dominique
#Last name?   Thiebaut
#Id?          990123456
#Final grade? 90
#
#+———————————————————————————————————-———————————-+
#|Dominique Thiebaut                    990123456 |
#+———————————————————————————————————-———————————-+
#      00...10...20...30...40...50...60...70...80...90...100
#grade: #############################################
#class: ########################################
#
#

# box geometry
bar = "+———————————————————————————————————-———————————-+"
barLen = len( bar )

# input section
fName      = input( "First name? " )
fNameLen   = len( fName )
lName      = input( "Last name?  " )
lNameLen   = len( lName )
Id         = input( "Id?         " )
IdLen      = len( Id )
numSpaces  = barLen -3 -(fNameLen+1+lNameLen+IdLen)
grade      = eval( input( "Final grade? " ) )
classGrade = 80

# output section
print( bar )
print( '|' + fName, ' ', lName, ' '*(numSpaces), Id, ' |', sep='' )
print( bar )

# print the scale
print( "      00...10...20...30...40...50...60...70...80...90...100" )

# print the student grade as a bar
numHashTags = grade // 2
print( "grade:", '#' * numHashTags )

#print the class grade as a bar
numHashTags = classGrade // 2
print( "class:", '#' * numHashTags )

2/12/18

# teller.py
# D. Thiebaut
# simulates teller machine program
# prompts user, displays number of bills

# input amount to withdraw (use eval)
amount = eval( input( "Amount to withdraw? " ) )
amount = abs( amount )
print( "Amount:", amount )


# compute number of bills, 20, 10, 5, 1
no20s  = amount // 20
amount = amount % 20  # leftover after giving out all the 20s 

no10s  = amount // 10 
amount = amount % 10 # leftover after giving out all the 10s 

no5s   = amount // 5
amount = amount % 5 # leftover after giving out all the 5s 

no1s   = amount


# display number of bills
print( no20s, "$20-bill(s)" )
print( no10s, "$10-bill(s)" )
print( no5s, "$5-bill(s)" )
print( no1s, "$1-bill(s)" )

2/14/18

# generate a table of the powers of 2
"""
    0    1
    1    2
    2    4
    3    8
    4   16
    5   32
    6   64
    7  128
    8  256
    9  512
1234567890123
"""
for i in range( 10 ):
    print( "{0:5}{1:5}".format( i, 2**i ) )


# display the following table:
# 1: len(Doc    )= 3
# 2: len(Grumpy )= 6
# 3: len(Happy  )= 5
# 4: len(Sleepy )= 6
# 5: len(Dopey  )= 5
# 6: len(Bashful)= 7
# 7: len(Sneezy )= 6

count = 1
for name in ["Doc", "Grumpy", "Happy", 
                    "Sleepy", "Dopey", "Bashful",
                    "Sneezy" ]:
    print( "{0:1}: len({1:<7})= {2:1}"
            .format( count, name, len(name) ) )
    count = count + 1

2/16/18

# accumulate.py
# D. Thiebaut
# solution programs for 2/16/18

# --------------------------------------
# sum of all the numbers from 1 to 100
total = 0
#print( "initial total:", total )
for i in range( 0, 100+1, 5):
    #print( i, total )
    total = total + i
    #print( "after sum:", i, total )
    #print()

print( total )

# --------------------------------------
# average of [100, 95,100, 90, 60, 85]
total = 0
count = 0
for i in [100, 95,100, 90, 60, 85]:
    total = total + i
    print( "i =", i )
    count = count + 1
    print( "count = ", count )
    
print( "total = ", total, "count = ", count )
print( "average = ", total/count )


# --------------------------------------
a = "#"
b = "+"
final = ""
# from numbers to string
print( "before loop: a=", a, "b=", b )
for i in   [1,2,1,1,3,4]:
    #print( i * a, end="", sep="" )
    print( "i=", i, "a=", a, "b=", b )
    final = final + i*a
    print( "final =", final )
    a, b = b, a

print( "final string = ", final )

2/19/18

Different ways to print all the strings in a list.

def main():
    farm = ["pig", "dog", "horse", "hen" ]

    #--------------------------------------------------
    print( "method 1" )
    print( """pig
dog
horse
hen""" )

    #--------------------------------------------------
    print( "method 2" )
    print( farm )
    
    #--------------------------------------------------
    print( "method 3" )
    print( "pig\ndog\nhorse\nhen" )
    
    #--------------------------------------------------
    print( "method 4" )
    print( list( farm ) )

    #--------------------------------------------------
    print( "method 5" )
    print( farm[0], farm[1], farm[2], farm[3] )
    
    #--------------------------------------------------
    print( "method 6" )
    print( farm[0], farm[1], farm[2], farm[3], sep="\n" )
    
    #--------------------------------------------------
    print( "method 7" )
    for n in [0,1,2,3]:
       print( farm[n] )

    #--------------------------------------------------
    print( "method 8" )
    for animal in farm:
            print( animal )

    #--------------------------------------------------
    print( "method 9" )
    for animal in farm:
        for c in range( len( animal ) ):
            print( animal[c], sep="", end="")
        print(" " )
        
    #--------------------------------------------------
    print( "method 10" )
    for i in range( len( farm ) ):
        print( farm[i] )

    #--------------------------------------------------
    print( "method 11" )
    for i in range( -1, -len(farm), -1 ):
            print( farm[ i ] )

    #--------------------------------------------------
    print( "method 12" )
    for i in range( -1, -len(farm)-1, -1 ):
            print( farm[ i ] )

    #--------------------------------------------------
    print( "method 13" )
    for i in range( -len(farm), 0, 1 ):
            print(farm[i] )

main()

02/21/18

>>> name = "H:/Documents/solutionsHw4.doc"

>>> name
'H:/Documents/solutionsHw4.doc'
>>> drive = name[0:2]
>>> drive
'H:'
>>> name
'H:/Documents/solutionsHw4.doc'
>>> ext = name[-3: ]
>>> ext
'doc'
>>> newName = name[0:-3]
>>> newName
'H:/Documents/solutionsHw4.'
>>> newName = name[0:-3] + "txt"
>>> newName
'H:/Documents/solutionsHw4.txt'
>>> fname = "Alex"
>>> lname = "Booth"
>>> account = fname[0:1] + lname
>>> account
'ABooth'
>>> account = fname[0] + lname
>>> account
'ABooth'


>>> date = "02212018"
>>> wanted = "21 Feb 2018"
>>> date
'02212018'
>>> wanted
'21 Feb 2018'
>>> months = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun"
	   ,"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ]
>>> months
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
>>> months[1]
'Feb'
>>> months[2]
'Mar'
>>> months = ["Dummy", 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
>>> months[2]
'Feb'
>>> day = date[2:4]
>>> day
'21'
>>> month = date[0:2]
>>> month
'02'
>>> int( month )
2
>>> months[ int( month ) ]
'Feb'
>>> date
'02212018'
>>> year = date[4: ]
>>> year
'2018'
>>> print( day, months[ int( month ) ], year )
21 Feb 2018
>>> date
'02212018'
>>> day
'21'
>>> month
'02'
>>> year
'2018'
>>> months
['Dummy', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
>>> months[ int( month ) ]
'Feb'


>>> fname = "Maria"
>>> lname = "Luce"
>>> name = fname + lname
>>> name
'MariaLuce'
>>> for i in range( len( name ) ):
	print( i )

	
0
1
2
3
4
5
6
7
8
>>> for i in range( len( name ) ):
	print( i, name[0:i] )

	
0 
1 M
2 Ma
3 Mar
4 Mari
5 Maria
6 MariaL
7 MariaLu
8 MariaLuc

>>> for i in range( len(name ) ):
	print( i, name[0:i+1] )

	
0 M
1 Ma
2 Mar
3 Mari
4 Maria
5 MariaL
6 MariaLu
7 MariaLuc
8 MariaLuce
>>> for i in range( len( name ) ):
	print( name[0:i+1] )

	
M
Ma
Mar
Mari
Maria
MariaL
MariaLu
MariaLuc
MariaLuce


>>> farm = [ "pig", "dog", "cat" ]
>>> farm
['pig', 'dog', 'cat']
>>> farm[0]
'pig'
>>> farm[1]
'dog'
>>> farm[-1]
'cat'
>>> 
>>> 
>>> farm[ 0 ] = "horse"
>>> farm
['horse', 'dog', 'cat']
>>> farm[2] = "mouse"
>>> farm
['horse', 'dog', 'mouse']
>>> farm[-1] = "cat"
>>> farm
['horse', 'dog', 'cat']
>>> name = "Smith College"
>>> 
>>> 
>>> 
>>> 
>>> name[0]
'S'
>>> name[-1]
'e'
>>> name[2]
'i'
>>> name[0] = 'Z'
Traceback (most recent call last):
  File "<pyshell#94>", line 1, in <module>
    name[0] = 'Z'
TypeError: 'str' object does not support item assignment   <--- strings are immutable!
>>> farm2 = ( "cat", "dog", "mouse" )
>>> farm2[1]
'dog'
>>> farm2[1] = "horse"
Traceback (most recent call last):
  File "<pyshell#97>", line 1, in <module>
    farm2[1] = "horse"
TypeError: 'tuple' object does not support item assignment
>>> animal = "horse"
>>> animal[0] = 'H'
Traceback (most recent call last):
  File "<pyshell#99>", line 1, in <module>
    animal[0] = 'H'
TypeError: 'str' object does not support item assignment
>>> animal = 'H' + animal[1: ]
>>> animal
'Horse'



>>> greeting = "hello there"
>>> greeting.upper()
'HELLO THERE'
>>> greeting
'hello there'
>>> greeting = greeting.upper()
>>> greeting
'HELLO THERE'
>>> lname = "Max"
>>> fname = "Joe"
>>> fname[0] + lname
'JMax'
>>> account = fname[0] + lname
>>> account
'JMax'
>>> account = account.lower()
>>> account
'jmax'
>>> title = "CSC111 Intro to CS"
>>> title.center( 60 )
'                     CSC111 Intro to CS                     '
>>> title
'CSC111 Intro to CS'
>>> print( title.center( 60 ) )
                     CSC111 Intro to CS                     
>>> name = "alex booth"
>>> name.capitalize()
'Alex booth'
>>> name
'alex booth'
>>> name.title()
'Alex Booth'
>>> name = "MICKEY MOUSE"
>>> name.capitalize()
'Mickey mouse'
>>> name.title()
'Mickey Mouse'
>>> name
'MICKEY MOUSE'
>>> name = name.title()
>>> name
'Mickey Mouse'
>>> name.find( 'z' )
-1
>>> name.find( 'o' )
8
>>> name.find( 'M' )
0
>>> name.find( 'c' )
2
>>> name.find( "ou" )
8
>>> name
'Mickey Mouse'
>>> name.replace( "Mickey", "Minnie" )
'Minnie Mouse'
>>> name
'Mickey Mouse'
>>> name.replace( "Mouse", "Cat" )
'Mickey Cat'
>>> name
'Mickey Mouse'
>>> name.replace( 'M', 'Z' )
'Zickey Zouse'
>>> name
'Mickey Mouse'
>>>

2/23/18

# examples
# D. Thiebaut

line = "The quick red fox jumped over the lazy brown sleeping dog"
line.split( " " )   # that's a space



poem = """Chocolate
Chocolate is the first luxury.
It has so many things wrapped up in it:
Deliciousness in the moment,
childhood memories,
and that grin-inducing
feeling of getting a reward for being good.
--Mariska Hargitay"""

Working with Text Files

Here's the text to store in the text file called chocolate.txt. You can use Notepad or TextEdit to do that. Make sure you use ".txt" as the extension, and select "plain text" or "plain ASCII" as the format.

Strength is the capacity to break

a Hershey bar into four pieces

with your bare hands - and then

eat just one of the pieces.

-Judith Viorst

And here's the program that reads this file

# readChocolateFile.py
# D. Thiebaut
# Opens a text file and displays it contents.
# Note: you need to have a file called chocolate.txt
# in the same directory/folder where you have saved
# this program!!!
@

def main():
    # open file
    file = open( "chocolate.txt", "r" )

    # read each line from file and display it
    for line in file:
        print( line )

    # close the file
    file.close()

main()

2/26/18

# readChocolateFile.py
# D. Thiebaut
# Opens a text file and displays it contents.
# Note: you need to have a file called chocolate.txt
# in the same directory/folder where you have saved
# this program!!!


def main():
    # open file
    file = open( "chocolate.txt", "r" )

    # read each line from file and display it
    for line in file:
        print( line.strip() )

    # close the file
    file.close()

main()

# ----------------------------------------------------------------------


def singHappyBirthday( minion ):
    print( "Happy birthday to you" )
    print( "Happy birthday to you" )
    print( "Happy birthday, dear", minion )
    print( "Happy birthday to you" )
    print( )
    
def main():
    for minion in [ "Dave", "Stuart", "Jerry", "Jorge" ]:
        singHappyBirthday( minion )

main()

# ----------------------------------------------------------------------

# DaveEats.py
# D. Thiebaut


def DaveEats( fruit ):
    print( "Dave opens their mouth" )
    print( "and eats the", fruit )
    print()



def main():
    for fruit in [ "banana", "apple", "orange" ]:
        DaveEats( fruit )
        
    
main()

# ----------------------------------------------------------------------

# printBarSayHello.py
# D. Thiebaut


def printBar():
    print( 60 * '-' )


def sayHello():
    print( )
    print( "Hello, and welcome!" )
    print( )

def main():
    printBar()
    printBar()

main()
 

# ----------------------------------------------------------------------

3/2/2018

functionBootCamp2

# functionBootCamp2.py
# D. Thiebaut

def cutDNA( DNA, marker ):
    DNA = DNA.upper()
    marker = marker.upper()
      
    index = DNA.find( marker )
    index2 = index + len( marker )
    leftOver = DNA[ index2: ]
    return leftOver

def main():
    dna = "ACGTTTA"
    marker = "G"

    print( cutDNA( dna, marker ) )

    print( cutDNA( "AAAAATTTT", "at" ) )

main()

Program developed in Class

The assignment is to write a program that gets lines from a text file, representing a memo, and words from another text file, representing words to censure out of the memo. The program then takes both list of strings and blocks out all the bad words from the memo.

def block( bad, line ):
    """ takes a line and a bad word and replaces
    the bad word with xs"""
    xbad = "x" * len( bad )
    line = line.replace( bad, xbad )
    return line

def getMemo():
    memo = [ "Send 10 tons of burgers to White House",
             "before midnight", "That's a lot of burgers!" ]
    return memo

def getBad():
    bad = [ "burger", "tons", "House" ]
    return bad

def processMemo( lines, bad ):
    newLines = [ ]
    for line in lines:
        line = block( bad, line )
        newLines.append( line )
    return newLines

def main():
    lines = getMemo( )
    bads   = getBad()

    for bad in bads:
        lines = processMemo( lines, bad )

    for line in lines:
        print( line )
        
main()

Good Preparation for Homework #5

The same program is developed in several steps (versions) below. We start with a very simplified version of what we have to implement, and one step at a time we add more functionality, using functions.

Version 1

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured"""
    return "Please deliver 10 burgers and 1 bottle of ketchup"

def getBadWord():
    """gets the word to block out"""
    return "burger"

def main():
    # get a line of text, and a bad word 
    line = getMemo( )
    bad  = getBadWord( )

    # modify line by removing the bad word
    line = line.replace( bad, "x" )
    print( line )
    
main()

Version 2

In this version, we create a new function called block() that gets a line and a bad word, and replaces the bad word in line by a series of xs. Block() returns the new version of the line.

The main program now calls block() to block out the bad word in the line, gets the line back and prints it.

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured"""
    return "Please deliver 10 burgers and 1 bottle of ketchup"

def getBadWord():
    """gets the word to block out"""
    return "burger"

def block( line, bad ):
    # create a word with 'x' the same length
    # as the bad word
    badx = "x" * len( bad )

    # modify the line and replace bad with "xx...x"
    line = line.replace( bad, badx )
    return line
    
def main():
    # get a line of text, and a bad word 
    line = getMemo( )
    bad  = getBadWord( )

    # modify line by removing the bad word
    line = block( line, bad )

    # display the resulting line
    print( line )
    
main()

Version 3

In this version, instead of working with just one word, we work with a list of bad words. We change the name of getBadWord() to getBadWords() to reflect the fact that it is returning a list of words. We now have for loop in the main program to iterate through all the bad words.

You may want to remove the #-sign in the main program to see what is happening with the code.

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured"""
    return "Please deliver 10 burgers and 1 bottle of ketchup"

def getBadWords():
    """gets the word to block out"""
    badWords = [ "burger", "ketchup" ]
    return badWords

def block( line, bad ):
    # create a word with 'x' the same length
    # as the bad word
    badx = "x" * len( bad )

    # modify the line and replace bad with "xx...x"
    line = line.replace( bad, badx )
    return line
    
def main():
    # get a line of text, and a bad word 
    line = getMemo( )
    badWords  = getBadWords( )

    # modify line by removing the bad word
    for bad in badWords:
        #print( "blocking out word:", bad )
        #print( "line before:      ", line )
        line = block( line, bad )
        #print( "line after:       ", line )
        #print()

    # display the resulting line
    print( line )
    
main()

Output

blocking out word: burger
line before:       Please deliver 10 burgers and 1 bottle of ketchup
line after:        Please deliver 10 xxxxxxs and 1 bottle of ketchup

blocking out word: ketchup
line before:       Please deliver 10 xxxxxxs and 1 bottle of ketchup
line after:        Please deliver 10 xxxxxxs and 1 bottle of xxxxxxx

Please deliver 10 xxxxxxs and 1 bottle of xxxxxxx

Version 4

We're making the code more modular by taking some code from main and packaging into a new function, called blockAllWordsInOneLine().
No new behavior is brought in, just moving some code out of main to keep main short and easy to read.

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured"""
    return "Please deliver 10 burgers and 1 bottle of ketchup"

def getBadWords():
    """gets the word to block out"""
    badWords = [ "burger", "ketchup" ]
    return badWords

def block( line, bad ):
    # create a word with 'x' the same length
    # as the bad word
    badx = "x" * len( bad )

    # modify the line and replace bad with "xx...x"
    line = line.replace( bad, badx )
    return line

def blockAllWordsInOneLine( line, badWords ):
    """ gets one line and a list of bad words and
    blocks out all the bad words in the line.  Returns
    the edited line.
    """
    for bad in badWords:
        line = block( line, bad )
    return line

def main():
    # get a line of text, and a bad word 
    line = getMemo( )
    badWords  = getBadWords( )

    # modify line by removing the bad word
    line = blockAllWordsInOneLine( line, badWords )
        
    # display the resulting line
    print( line )
    
main()

Version 5

We now make the function getMemo() return a list of lines, rather than just one line.
The main program must be changed, since it is now getting a list of strings rather than one string. A for-loop is all that we need. Not much change, but much more powerful program!

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured"""
    memo = [ "Please deliver 10 burgers and 1 bottle of ketchup",
             "Make it 20 burgers and a caisse of ketchup",
             "burgers and ketchup are the best food!" ]
    
    return memo

def getBadWords():
    """gets the word to block out"""
    badWords = [ "burger", "ketchup" ]
    return badWords

def block( line, bad ):
    # create a word with 'x' the same length
    # as the bad word
    badx = "x" * len( bad )

    # modify the line and replace bad with "xx...x"
    line = line.replace( bad, badx )
    return line

def blockAllWordsInOneLine( line, badWords ):
    """ gets one line and a list of bad words and
    blocks out all the bad words in the line.  Returns
    the edited line.
    """
    for bad in badWords:
        line = block( line, bad )
    return line

def main():
    # get a line of text, and a bad word 
    lines = getMemo( )
    badWords  = getBadWords( )

    for line in lines:
        # modify line by removing the bad word
        line = blockAllWordsInOneLine( line, badWords )
        
        # display the resulting line
        print( line )
    
main()

Please deliver 10 xxxxxxs and 1 bottle of xxxxxxx
Make it 20 xxxxxxs and a caisse of xxxxxxx
xxxxxxs and xxxxxxx are the best food!

Version 6

In this version we change the getMemo() function so that it gets the lines of the memo from the file memo.txt. This file is already defined in the same directory where we save our programs. For this example, memo.txt contains the following lines:

We need 10 tons of burgers and 1 ton of ketchup 
sent to the President before midnight.

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured from the file memo.txt"""
    #memo = [ "Please deliver 10 burgers and 1 bottle of ketchup",
    #         "Make it 20 burgers and a caisse of ketchup",
    #         "burgers and ketchup are the best food!" ]

    # open the file for reading
    file = open( 'memo.txt', 'r' )

    # add each line of the file to memo (list)
    memo = []
    for line in file:
        memo.append( line.strip() )

    # close the file
    file.close()

    # return the list of string read from the file
    return memo

def getBadWords():
    """gets the word to block out"""
    badWords = [ "burger", "ketchup" ]
    return badWords

def block( line, bad ):
    # create a word with 'x' the same length
    # as the bad word
    badx = "x" * len( bad )

    # modify the line and replace bad with "xx...x"
    line = line.replace( bad, badx )
    return line

def blockAllWordsInOneLine( line, badWords ):
    """ gets one line and a list of bad words and
    blocks out all the bad words in the line.  Returns
    the edited line.
    """
    for bad in badWords:
        line = block( line, bad )
    return line

def main():
    # get a line of text, and a bad word 
    lines = getMemo( )
    badWords  = getBadWords( )

    for line in lines:
        # modify line by removing the bad word
        line = blockAllWordsInOneLine( line, badWords )
        
        # display the resulting line
        print( line )
    
main()

Output

We need 10 tons of xxxxxxs and 1 ton of xxxxxxx
sent to the President before midnight.

Version 7

Since we were successful getting the lines from file for the memo, we are doing the same thing for the bad words.

The file badwords.txt contains the following words:

burger
ketchup
President

# censureText.py
# D. Thiebaut
# This program opens two text files,
# one containing lines of text, the other one
# containing a list of words to remove,
# and prints the contents of the first file
# with words blocked out.

def getMemo():
    """gets the memo to be censured from the file memo.txt"""
    #memo = [ "Please deliver 10 burgers and 1 bottle of ketchup",
    #         "Make it 20 burgers and a caisse of ketchup",
    #         "burgers and ketchup are the best food!" ]

    # open the file for reading
    file = open( 'memo.txt', 'r' )

    # add each line of the file to memo (list)
    memo = []
    for line in file:
        memo.append( line.strip() )

    # close the file
    file.close()

    # return the list of string read from the file
    return memo

def getBadWords():
    """gets the list of words to block out from file"""
    # open the file for reading
    file = open( 'badwords.txt', 'r' )

    # add each line of the file to list of bad words
    bads = []
    for line in file:
        bad = line.strip()
        bads.append( bad )
        
    # close the file
    file.close()

    # return the list of string read from the file
    return bads


def block( line, bad ):
    # create a word with 'x' the same length
    # as the bad word
    badx = "x" * len( bad )

    # modify the line and replace bad with "xx...x"
    line = line.replace( bad, badx )
    return line

def blockAllWordsInOneLine( line, badWords ):
    """ gets one line and a list of bad words and
    blocks out all the bad words in the line.  Returns
    the edited line.
    """
    for bad in badWords:
        line = block( line, bad )
    return line

def main():
    # get a line of text, and a bad word 
    lines = getMemo( )
    badWords  = getBadWords( )

    for line in lines:
        # modify line by removing the bad word
        line = blockAllWordsInOneLine( line, badWords )
        
        # display the resulting line
        print( line )
    
main()

Output

We need 10 tons of xxxxxxs and 1 ton of xxxxxxx
sent to the xxxxxxxxx before midnight.

03/09/18

libraryDemo.py

# libraryDemo.py
# D. Thiebaut

from myLibrary import *

def main():
    lines = [ "Soon there'll be lunch", "Spring into action",
              "Break bad habits!" ]

    for line in lines:
        print( getFirstWordOf( line ), end=" " )

    print()

main()

myLibrary.py

# myLibrary.py
# D. Thiebaut


def getFirstWordOf( line ):
    '''receives a line assumed not to be empty
    and returns its first words.  Uses whitespace
    to split the line into words.
    '''
    words = line.strip().split()
    return words[0]

NQueens.py

#! /opt/local/bin/python
# D. Thiebaut
# Usage:
#   nqueens.py N
# where N is the number of queens wanted, i.e. the dimension
# of the board.
# The program will look for the first available solution where N queens
# can be put on the board such that they cannot take each other.

import sys
import time
QUEEN = -10
EMPTY = 0

class timePerfClass:
    """A class to keep track of processor and user time.
    use by first calling start(), then stop(), then 
    printElapsed()"""

    def __init__(self):
        self.clockStart = time.clock() # init all 4 counters
        self.clockEnd   = time.clock() # to current time
        self.timeStart  = time.time()
        self.timeEnd    = time.time()

    def start( self ):
        """set the start counters to current time"""
        self.clockStart = time.clock()
        self.timeStart  = time.time()

    def stop( self ):
        """set the end counters to current time"""
        self.clockEnd   = time.clock()
        self.timeEnd    = time.time()

    def printElapsed( self ):
        """print the difference between end and start counters"""
        print "processor time:   ", (self.clockEnd-self.clockStart), "sec"
        print "user time     :   ", (self.timeEnd-self.timeStart), "sec"


def makeBoard( N ):
    """create a 2-D array of ints with dimension N
    Returns the 2D array"""
    board = []
    for i in range( N ):
        board.append( [] )
        for j in range( N ):
            board[i].append( EMPTY )
    return board
    
def goHome():
    """when used  in a terminal window that supports ANSI codes,
    brings the cursor back to top left position"""
    sys.stderr.write( "\x1b[0;0H" )

def displaySolution( board ):
  """display the solution, in the form of a series of column numbers"""
  list = []
  for i in range( len( board ) ):
      for j in range( len( board ) ):
          if board[ i ][ j ]==QUEEN:
              list.append( str( j ) )
  print "Solution = ", ','.join( list )

def displayBoard( board, home=False ):
    """display the 2D array, showing empty cells as .
    and queens as Q"""
    if home: goHome()
    for i in range( len( board ) ):
        for j in range( len( board ) ):
            if board[i][j]==QUEEN: 
               print 'Q',
            else: 
               print '.',
        print
    displaySolution( board )
    
def markLowerBoard( board, row, col, offset ):
    """Once a queen is positioned at location (row,col), 
    all the cells on a lower diagonal and lower vertical
    of this queen must be marqued as unavailable so that
    another queen cannot be put in this place"""

    N = len( board )
    diagleft = col-1
    diagright = col+1
    # mark all lower rows on diagonals and vertical
    for r in range( row+1, N ):
        if diagleft >=0:  board[r][diagleft] += offset
        if diagright <N:  board[r][diagright] += offset
        board[r][col] += offset
        diagleft  -= 1
        diagright += 1

def tryRow( board, row,  N, display=False ):
    """ put a queen on give row, and recursively try all queens
    on successive rows"""
    if row >= N:
       return True #we found a solution!

    if display:
        displayBoard( board, True )
    for col in range( N ):
        if board[row][col] == EMPTY:
            # put a queen here
            board[ row ][ col ] = QUEEN
            markLowerBoard( board, row, col, +1 )
            ok = tryRow( board, row+1, N )
            if not ok:
                # backtrack
                board[ row ][ col ] = EMPTY
                markLowerBoard( board, row, col, -1 )
            else:
                return True
    return False           
           
       
# ---------------------------------------------------------------------------
def main():
    if len( sys.argv ) < 2:
        print "Syntax: nqueens.py N"
        print "        where N is the # of queens"
        return

    #--- start measurement ---
    perf = timePerfClass()
    perf.start()

    #--- get dimension, create board, and solve! ---
    N = int( sys.argv[1] )
    board = makeBoard( N )
    ok = tryRow( board, 0, N )

    #--- stop measurement ---
    perf.stop()
    perf.printElapsed()
    
    if ok:
         print "Success!"
         displayBoard( board )

if __name__=="__main__":
    main()

03/19/18

facebookNews.txt

This file is taken from a news article published on 3/18/2018 about Facebook.

Lawmakers in the United States and Britain are calling on Facebook chief executive Mark Zuckerberg 
to explain how the names, preferences and other information from tens of millions of users ended up 
in the hands of a data analysis firm connected with President Trump's 2016 campaign.

The demands came in response to news reports Saturday about how the firm, Cambridge Analytica, used 
a feature once available to Facebook app developers to collect information on 270,000 people and, 
in the process, gain access to data on tens of millions of their Facebook friends  few, if any, 
of whom had given explicit permission for this sharing.

emails.txt

<source lang="text">

Lauryn@smith.edu Amaris@smith.edu Lujun@smith.edu Cora@smith.edu smithy@umass.edu Olive@smith.edu Giuliana@smith.edu Marina@smith.edu Aliyah@smith.edu Itzel@hampshire.edu Rui@smith.edu Perla@smith.edu Julissa@smith.edu Linda@smith.edu Carolina@smith.edu Beatrice@smith.edu Carly@smith.edu Iris@umass.edu Lu@smith.edu Armani@smith.edu Julianna@smith.edu Mattie@smith.edu Diya@smith.edu Maria@smith.edu Payten@smith.edu Caroline@amherst.edu Gemma@smith.edu Jade@smith.edu Scarlet@smith.edu Alejandra@smith.edu Phoebe@smith.edu Harper@smith.edu Tianna@smith.edu Litzy@smith.edu Adison@mtholyoke.edu Isabell@smith.edu Yuliana@smith.edu Lillian@smith.edu Callie@smith.edu Hadley@smith.edu Camille@smith.edu Tara@smith.edu Desirae@smith.edu Miya@smith.edu Laura@smith.edu Leticia@smith.edu Emily@smith.edu Krista@smith.edu Ashtyn@smith.edu Alina@smith.edu Tiara@smith.edu Cameron@smith.edu Amaya@smith.edu Jewel@smith.edu Brenda@smith.edu Angel@smith.edu Anahi@smith.edu Lara@smith.edu Regina@smith.edu Mylie@smith.edu Kyra@smith.edu Lindsay@smith.edu Katherine@smith.edu Raven@smith.edu Chloe@smith.edu Wendy@smith.edu Amara@smith.edu Adelyn@smith.edu Sharon@smith.edu Carlee@smith.edu Aisha@smith.edu Chana@smith.edu Paisley@smith.edu Amelie@smith.edu Dixie@smith.edu America@smith.edu Karla@smith.edu Alana@smith.edu Dulce@smith.edu Marlene@smith.edu Serena@smith.edu Annabel@smith.edu Karley@smith.edu Lyla@smith.edu Sandra@smith.edu Breanna@smith.edu Gracelyn@smith.edu Crystal@smith.edu Taniya@smith.edu Jazmin@smith.edu Madalyn@smith.edu Holly@smith.edu Janiya@smith.edu Paige@smith.edu Jaylene@smith.edu Cecelia@smith.edu Jaylynn@smith.edu Tori@smith.edu Madeline@smith.edu Aliza@smith.edu Rebekah@smith.edu Kimora@smith.edu Mayra@smith.edu Shea@smith.edu Ana@smith.edu Britney@smith.edu Aleena@smith.edu Yaritza@smith.edu Bridget@smith.edu Lindsey@smith.edu Ava@smith.edu Yareli@smith.edu Violet@smith.edu Londyn@smith.edu Tatum@smith.edu Patience@smith.edu Ayana@smith.edu Lizbeth@smith.edu Madison@smith.edu Elisabeth@smith.edu Halle@smith.edu Hallie@smith.edu Ashley@smith.edu Evelyn@smith.edu Evelin@smith.edu </text>