CSC111 Python Programs Fall 2015

--D. Thiebaut (talk) 10:34, 18 September 2015 (EDT)

---

Wed., 9/16/15

# displayWeek.py
# D. Thiebaut
# displays a schedule for the five days of the week

length = eval( input( "Length of bar? " ) )

print( "-" * length )
for day in [ "Mo:", "Tu:", "We:", "Th:", "Fr:" ]:
    print( day )
    #print( "  :" * 2)
    print( "  :" )
    print( "-" * length )

Friday, 9/18/15

# displayGrade.py
# D. Thiebaut
#
# prompts user for information and
# grade.
# display user's grade in graph, along with
# class average (constant)


# constant information
classAvg = 80

# user input.  Get info from user
fName = "Al"
lName = "K"
Id    = "990123456"
final = 90


#--- Format information and display ---
# create the bar 
bar = "+" + 48*"-" + "+"
lenBar = len( bar )

# compute the number of dashes
noSpaces = lenBar - len( fName ) -len(lName )-len(Id) - 6
spaces = " " * noSpaces

# create the scale
scale = "      00...10...20...30...40...50...60...70...80...90...100"

# display the information
print( bar )
print( "|" + fName, lName, spaces, Id, "|" )
print( bar )
print()
print( scale )
# the length of the bar for the bar-graph, in number of characters
# is 1/2 the actual grade.  So divide the grade by half to get the
# number of chars.  We use // to get the integer part of the result
print( "grade:", (final//2) * "#" )
print( "class:", (classAvg//2) * "#" )

Monday, 9/21/15

Version 1 of Teller Machine program

# tellerMachine.py
# D. Thiebaut
# A program that simulates a teller machine, where user enters an amount of
# dollars, and program figures out the number of bills to return.

# get the amount 
amount = eval( input( "Please enter amount: " ) )
amount = int( amount )
print()

# break down into bills
no20s = amount // 20       # how many 20s go into amount
amount = amount % 20    # what is left over after giving out 20s go back into amount

no10s = amount // 10
amount = amount % 10

no5s = amount //5
no1s = amount % 5

# display the results
print( "Amount withdrawn = ", amount )
print( "Please lift your keyboard and find: " )
print( no20s, "$20-bill(s)" )
print( no10s, "$10-bill(s)" )
print( no5s, "$5-bill(s)" )
print( no1s, "$1-bill(s)" )

Version 2, submitted by Shirui Cheng, who figured out that it was a perfect opportunity to use a loop!

# Teller machine simulator
# Shirui Cheng

# get the input
amount = eval(input ("How much money do you want to withdraw? "))

# break down in $20-, $10-, $5-, and $1-bills
# and print the result at every step
for bill in (20, 10, 5, 1):
    no = amount // bill
    amount = amount % bill
    print (no, "$", bill, "bill(s)")

Wednesday, 9/23/15

# averageAge.py
# D. Thiebaut
#
# Example of how one would go about computing
# the average value of a list of numbers.
#
def main():

    # initialize variables
    sum = 0
    count = 0

    # loop through a list of ages and compute the total sum
    # of the ages, and the number of values in the list.
    for age in [20, 19, 21, 20, 21, 29, 17]:
        sum = sum + age
        count = count + 1

    # compute the average, displays quantities of interest
    print( "-" * 30 )
    print( "average = ", sum/count )

main()

Accumulating Strings

# stringPatterns.py
# D. Thiebaut
# print a string of 5 alternating patterns.

def main():
    # define 2 different patterns
    pat1 = "**"
    pat2 = "++"

    # create an empty string
    result = ""

    # loop 5 times (we want a string of 5 alternating patterns)
    for i in range( 5 ):
        # add a new pattern to the string
        result = result + pat1

        # switch the patterns around
        pat1, pat2 = pat2, pat1

    # done with the loop!  Print string of patterns
    print( result )

main()

Friday, 9/25/15

# averageAge.py
# D. Thiebaut
#
# Example of how one would go about debugging a simple
# program and reveal how the loop works.
#
def main():

    # initialize variables
    sum = 0
    count = 0
    print( "sum = {0:1} count = {1:1}".format( sum, count ) )
    input()

    # loop through a list of ages and compute the total sum
    # of the ages, and the number of values in the list.
    for age in [20, 19, 21, 20, 21, 29, 17]:
        sum = sum + age
        count = count + 1
        print( "age = {0:5} sum = {1:5} count = {2:5}".format( age, sum, count ) )
        input()

    # compute the average, displays quantities of interest
    print( "-" * 30 )
    print( "sum = ", sum )
    print( "count = ", count )
    print( "average = ", sum/count )

main()

Wed., 9/30/15

# exercises 9/30/15

def main():
    # Exercise #1
    fName = "SOPHIA"
    lName = "smith"

    fullName = fName + " " + lName

    print( fullName.title().center( 60 ) )
    print( "\n", "-"*60, "\n\n", sep="" )
   
    # Exercise #2
    # Define the string with multiple lines
    book = """Ulysses
    James Joyce
    Stately, plump Buck Mulligan came from the stairhead, 
    bearing a bowl of lather on which
    a mirror and a razor lay crossed. 
    """

    # split the book into a list of lines
    lines = book.splitlines()

    # assign different lines to variables
    bookTitle = lines[0]
    author = lines[1]
    sentence = lines[2] + lines[3] + lines[4]
    # this next statement is too sophisticated for now
    #sentence = " ".join( lines[2: ] )

    # display the result
    print( bookTitle.upper().center( 60 ) )
    print( author.title().center( 60 ) )
    print( )
    print( sentence )

main()

Fri., 10/2/15

# Using split()
# -------------------------
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"""

# display each line centered in 60 spaces.
# first line all uppercase.
# last line right justified in 60 spaces.

lines = poem.split( "\n" )
#print( lines )

# -----------------------------------------------------------------------
# (remove the triple double-quotes to energize the code section)
print( lines[0].upper().center(60) )

for line in lines[1: ]:
    print( line.center( 60 ) )

# -----------------------------------------------------------------------
print( "-" * 60 )

lines[0] = lines[0].upper()
for line in lines[0:3]+lines[4:]:
    print( line.center(60) )

Another Example

# -------------------------
# Another Example
# -------------------------


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


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


def main():
    for i in range( 10 ):
        printBar() 
    sayHello()
    printBar()

main()

Happy Birthday

# ------------------------------------------
# Sing Happy Birthday to some Minions
# ------------------------------------------

def singHappyBirthday( minion ):
    print( "Happy birthday to you\n" * 2, end="" )
    print( "Happy birthday, dear", minion )
    print( "Happy birthday to you" )
    print()
    
def main():
    #singHappyBirthday( "Dave" )
    #singHappyBirthday( "Stuart" )
    minions = "Dave, Stuart, Jerry, Jorge, Tim, Mark, Phil, Kevin,  Jon"

    minions = minions.split( ", " )
    #print( minions )
    
    for minion in minions:
        singHappyBirthday( minion.strip() )
        
main()

Mon. 10/5/15

Converting Temperatures

# F  = C * 9 / 5 + 32
def convert( c ):
    return int( c * 9/5 + 32 )


def main():
    for C in [ 0, 32, 100 ] :
        fahr = convert(  C )
        print( fahr )


main()

Transforming dates

def singHappyBirthday( minion ):
    print( "minion = ", minion )
    #print( "Happy birthday to you\n" * 2, end="" )
    #print( "Happy birthday, dear", minion )
    #print( "Happy birthday to you" )
    #print()

def worker0( ):
    return "clap " *  10  

def worker1( num1 ):
    return num1 * 2 + 1 

def worker2( n ):
    return n % 10 

def worker3( p ):
    p = worker1( p )
    p = worker2( p )
    return p 
    
def dateConvert( date ):
    """converts a date in the form "2 Jan 2010" into
    a date of the form 01022010"
    """
    # split the string into day, month, and year
    fields = date.split()
    day = fields[0]
    month = fields[1]
    year = fields[2]

    #print( day, month, year )

    # if the day is less than 10, add a 0 in front of it
    day = ( '0' + day )[-2: ]
    
    #print( day, month, year )

    # find where the month is located in a string of 3-letter
    # months.  If the string is "Jan", then the location will
    # be 0.  If the string is "Feb", then the location will be 3,
    # etc.
    months = "janfebmaraprmayjunjulaugsepoctnovdec"
    index  = months.find( month.lower() )

    # divide by 3 to find the index in the form 0, 1, 2,... 11.
    # and add 1 to make this 1, 2,... 12
    monthDigit = index//3 + 1

    # transform this digit into a string, with a 0 in front
    # in case the digit is less than 10.
    monthDigit = "{0:02}".format( monthDigit )
    
    #print( day, month, year, monthDigit )

    # return the formatted string
    return "{0:1}{1:1}{2:1}".format( monthDigit, day, year )


def main():

    for date in [ "1 Jan 2010", "2 Mar 1900", "31 Dec 2015" ]:
        print( dateConvert( date ) )

    
main()

• Output:

01012010
03021900
12312015

Fri. 10/9/15

Once More: the Teller Machine program

def getAmount():
    amount = eval( input( "Amount? " ) )
    return abs( amount )

def breakDown( amount ):
    no20s, amount = amount // 20, amount % 20
    no10s, amount = amount // 10, amount % 10
    no5s, amount   = amount // 5, amount % 5
    no1s = amount

    return no20s, no10s, no5s, no1s

def display(orgAmount, No20s, No10s, No5s, No1s ):
    print( orgAmount, No20s, No10s, No5s, No1s )
    return 
    
def main():
    # get amount from user
    amount = getAmount( )
    orgAmount = amount    # keep value of original amount
    
    # get Number of $20-, $10, $5-, and $1-bills
    No20s, No10s, No5s, No1s = breakDown( amount )

    # display result
    display( orgAmount, No20s, No10s, No5s, No1s )

main()

Flipping DNA

def getSentence(  ):
    sentence = input( "Enter a list of words: " )

    words = sentence.split( )
    for i in range( len( words ) ):
        #print( "i = ", i, "words = ", words )
        #print( "words[i] = ", words[i] )
        #print( "words[i].capitalize() = ", words[i].capitalize() )
        words[i] = words[i].capitalize()
        #print( "i = ", i, "words = ", words )
        #print()
        
    return words

def flip( DNA ):
    newDNA = DNA.replace( "A", "t" ).replace( "T", "a" )
    newDNA = newDNA.replace( "G", 'c' ).replace( "C", 'g' )
    return newDNA.upper()
        
def main():

    listWords = getSentence( )
    print( "list = ", listWords )

    print( "AAACGTTTAG", flip( "AAACGTTTAG" ), sep="\n" )
    
main()

Wed 10/14/15

dempolls.raw

<html>
<head>
<title>
Democratic Polls
</title>
</head>
<body>
<h1>Results</h1>
<data />
</body>
</html>

dempolls.data

Biden 19.1
Chafee 0.6
Clinton 44.4
Lessig 0.0
O'Malley 1.0
Sanders 25.1
Webb 1.2

createDynamicWebPage.py

# createDynamicWebPage.py
# D. Thiebaut
# create dynamic Web page


import datetime  # get a library that will allow
                 # us to print today's date.

# getTextFrom(): given a file name, opens the
# file, gets its contents as a string, and return
# it.
def getTextFrom( fileName ):
    file = open( fileName, "r" )
    text = file.read()
    file.close()
    return text

def main():

    # get the raw html file
    html = getTextFrom( "dempolls.raw" )

    # get the raw data file
    candidates = getTextFrom( "dempolls.data" )

    # replace <data /> tag with the data just
    # read in the raw html file.
    today = datetime.datetime.today().strftime("%m/%d/%Y")
    newString = today + "<br />" + candidates
    html = html.replace( "<data />", newString )

    # store new html to file
    file = open( "dempolls.html", "w" )
    file.write( html )
    file.close()

    # tell the user that process is over
    print( "File dempolls.html created, and in your directory!" )
    
main()

Wed. 10/21/15

graphicsDemo.py

# graphicsDemo.py
# D. thiebaut
# A demo program using the graphics library to make a ball
# move on the graphic window.

from graphics import *
from random import *

def main():
    # open the graphic window
    win = GraphWin("My Circle", 600, 600)

    # put some text in the middle of the window
    label = Text( Point( 300, 300 ),
                  "CSC111 Graphics Demo" )
    label.draw( win )
    
    # draw a circle
    x = 50
    y = 50
    r = 20
    c = Circle( Point( x, y ), r )
    red = randint( 0, 255 )
    green = randint( 0, 255 )
    blue = randint( 0, 255 )
    color = color_rgb( red, green, blue )
    c.setFill( color )
    c.draw( win )
    dx = 3
    dy = 0

    for i in range( 1000 ):
        # pick random color
        red = randint( 0, 255 )
        green = randint( 0, 255 )
        blue = randint( 0, 255 )
        color = color_rgb( red, green, blue )
        c.setFill( color )

        # move
        c.move( dx, dy )

        # see if bounce off walls
        center = c.getCenter()
        x = center.getX()
        if x > 600-r or x < 0+r:
            dx = -dx
        #win.getMouse()

        # move label
        label.move( 1, -1 )
        
    # wait for user to click in window
    win.getMouse() 

    # close the window
    win.close()

main()

Mon. 11/2/15

Exception, Version 1

# getInput: returns an integer larger
# than 0.  Expected to be robust…

def getInput():
  while True:
      x = int( input( "Enter a positive int:  " ) )        
      if  x >= 0:
          return x
      print( "invalid input.  Please reenter" )


def main():
   num = getInput()
   print( "you entered", num )

main()

Exception, Version 2

# getInput: returns an integer larger
# than 0.  Expected to be robust…

def getInput():
  while True:
      try:
          x = int( input( "Enter a positive int:  " ) )
      except ValueError:
          print( "Invalid number.  Please reenter" )
          continue
        
      if  x >= 0:
          return x
      print( "invalid input.  Please reenter" )


def main():
   num = getInput()
   print( "you entered", num )

main()

Quadratic Equation with Exceptions

import math

def ZelleExample():
    print( "solution to quadratic equation" )
    try:
        a, b, c = eval( input( "Enter 3 coefficients (a, b, c): " ) )
        disc = math.sqrt( b*b - 4*a*c )
        root1 = (-b + disc )/ (2*a)
        root2 = (-b - disc )/ (2*a)
        print( "solutions: ", root1, roo2 )
    except NameError:
        print( "You didn't enter 3 numbers!" )
    except TypeError:
        print( "Your input contained invalid numbers" )
    except SyntaxError:
        print( "Forgot a comma between the numbers? " )
    except ValueError:
        print( "No real roots, negative discriminant" )
    except:
        print( "Something went wrong..." )

def main():
    ZelleExample()

main()

Dice: Definining Classes

# DiceExample.py
# D. Thiebaut
# our first program where we define a class.
#
# The class implement a die, with some number
# of sides, and a way to "roll" and show a new
# number (value) up top.

# libraries
import random

# a class for a die
class Die:
    def __init__( self, n ):
         self.noSides = n
         self.value      = 1

    def roll( self ):
         self.value = random.randrange( 1, self.noSides+1 )

    def getValue( self ):
         return self.value


def main():
    # Create 2 dice, one with 6 sides, one with 8
    d1 = Die( 6 )
    d2 = Die( 8 )

    # Roll both dice
    d1.roll( )
    d2.roll( )

    # display their value
    print( "Die 1: ",  d1.getValue() )
    print( "Die 2: ",  d2.getValue() )

main()

A program with a class to implement Cat objects

# cats1.py
# D. Thiebaut
# Our first built-from scratch program involving
# classes and objects.
# In this program we read a CSV file containing
# the definitions of cats, one cat per line.
# We extract the name, vaccinated status, breed,
# and age of the cat, and save them in a cat
# object.  the Cat class is used to define how
# a cat object behaves.

class Cat:
    def __init__( self, na, vac, bre, ag ):
        self.name= na
        self.vaccinated = vac
        self.breed = bre
        self.age = ag

    def isVaccinated( self ):
        #if self.vaccinated == True:
        #    return True
        #else:
        #    return False
        return self.vaccinated

    def getName( self ):
        return self.name
    
def main():
    # Minou, 3, vac, stray
    text = """Minou, 3, vac, stray
    Max, 1, not-vac, Burmese
    Gizmo, 2, vac, Bengal
    Garfield, 4, not-vac, Orange Tabby"""

    catList = [] 
    for line in text.split( "\n" ):
        words = line.split( "," )
        if words[2].find( "not" ) != -1:
            vac = False
        else:
            vac = True
        age = int( words[1].strip() )
            
        cat = Cat( words[0], vac, words[3], age )
        catList.append( cat )
        
    #cat1 = Cat( "Minou", True, "stray", 3 )
    for cat in catList:    
        if cat.isVaccinated():
            print( cat.name, "is vaccinated" )
        else:
            print( cat.getName(), "is not vaccinated" )

main()

Cats1.csv File

Max, 1, vaccinated, not tattooed, stray
Black, 3, not vaccinated, tattooed, stray
Gizmo, 2, vaccinated, not tattooed, Bengal
Winston, 2, vaccinated, tattooed, Bengal
Garfield, 3, vaccinated, not tattooed, Burmese
Bob, 4, not vaccinated, tattooed, Orange Tabby
Minou, 1, vaccinated, tattooed, stray
Silky, 3, not vaccinated, tattooed, Siamese

Wed. 11/04/15

cats1.py

# cats1.py
# D. Thiebaut
# Our first built-from scratch program involving
# classes and objects.
# In this program we read a CSV file containing
# the definitions of cats, one cat per line.
# We extract the name, vaccinated status, breed,
# and age of the cat, and save them in a cat
# object.  the Cat class is used to define how
# a cat object behaves.

class Cat:
    def __init__( self, na, vac, bre, ag ):
        self.name= na
        self.vaccinated = vac
        self.breed = bre
        self.age = ag

    def isVaccinated( self ):
        #if self.vaccinated == True:
        #    return True
        #else:
        #    return False
        return self.vaccinated

    def getBreed( self ):
        return self.breed
    
    def getName( self ):
        return self.name

    def __str__( self ):
        if self.vaccinated == True:
            vacc = "vaccinated"
        else:
            vacc = "not vaccinated"
        return "{0:1}: {1:1} {2:1} {3:1} yrs old".format(
            self.name, vacc, self.breed, self.age )
    

def getCatList( fileName ):
    """parses a collection of lines and creates
    a list of cat objects."""

    file = open( fileName, "r" )
    text = file.read()
    file.close()

    catList = [] 
    for line in text.split( "\n" ):
        words = line.split( "," )
        
        if len( words ) != 4:
            continue
        
        if words[2].find( "not" ) != -1:
            vac = False
        else:
            vac = True
        age = int( words[1].strip() )
            
        cat = Cat( words[0].strip(), vac, words[3].strip(), age )
        catList.append( cat )
        
    return catList

def main():
    fileName = input( "File name? " )
    catList = getCatList( fileName )
    for cat in catList: print( cat )

    for cat in catList:
        if not cat.isVaccinated() and cat.getBreed()=="stray":
            print( cat )
        
    return
main()