Difference between revisions of "CSC111 Lab 6 2018"

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[[User:Thiebaut|D. Thiebaut]] ([[User talk:Thiebaut|talk]]) 12:27, 4 March 2018 (EST)
 
[[User:Thiebaut|D. Thiebaut]] ([[User talk:Thiebaut|talk]]) 12:27, 4 March 2018 (EST)
 
----
 
----
 +
<onlydft>
 +
<bluebox>
 +
This lab deals, once again, with functions.  Many functions, some receiving no parameters, some receiving several parameters, some returning nothing, some returning values.
 +
The goal of this lab is for you to feel comfortable creating functions that will perform simple tasks that can vary in
 +
</bluebox>
 +
<br />
 +
__TOC__
 +
<br />
 +
=Problem 1=
 +
<br />
 +
Write a function (in Idle or in the console) called '''bar()''' that prints a line of 30 #-characters.
 +
 +
>>> bar()
 +
##############################
 +
 +
<br />
 +
=Problem 2=
 +
<br />
 +
Create a new function called '''bar2()''' that receives the number of hash-tags and prints a line of that many #-signs.
 +
 +
 +
>>> bar2( 1 )
 +
#
 +
>>> bar2( 10 )
 +
##########
 +
>>> bar2( 5 )
 +
#####
 +
>>>
 +
 +
<br />
 +
=Problem 3=
 +
<br />
 +
Create a new function called '''bar3()''' that receives the number of #-signs and how many to print.
 +
 +
>>> bar3( 10, '#' )
 +
##########
 +
>>> bar3( 1, 'A' )
 +
A
 +
>>> bar3( 5, '-o' )
 +
-o-o-o-o-o
 +
>>>
 +
 +
<br />
 +
=Problem 4=
 +
<br />
 +
Modify the for-loop below, replacing the '?' symbols with the appropriate expressions, so that uses the loop prints the series of lines shown.
 +
<br />
 +
 +
>>> for i in range( ?, ? ):
 +
bar3( ?, '+' )
 +
 +
 +
+
 +
++
 +
+++
 +
++++
 +
>>>
 +
 +
<br />
 +
=Problem 5=
 +
<br />
 +
First, run this for-loop and observe what it does:
 +
 +
>>> symbols = [ '#', '+', 'o', '$' ]
 +
>>> for i in range( len( symbols ) ):
 +
print( symbols[i] )
 +
 +
<br />
 +
Similarly to what you did in Problem 4,  modify the code below so that it displays what is shown...
 +
<br />
 +
 +
>>> symbols = [ '#', '+', 'o', '$' ]
 +
>>> for i in range( len( ? ) ):
 +
bar3( ?, ? )
 +
 +
 +
#
 +
++
 +
ooo
 +
$$$$
 +
 +
<br />
 +
=Problem 6 =
 +
<br />
 +
Create a new function called '''bar4()''' that receives the number of symbols to print on one line, the symbol to use, and the number of lines to print.
 +
 +
 +
>>> bar4( 3, 10, '#' )
 +
##########
 +
##########
 +
##########
 +
>>> bar4( 2, 5, '+' )
 +
+++++
 +
+++++
 +
>>> bar4( 0, 5, 'o' )
 +
>>> bar4( 3, 0, '+' )
 +
 +
 +
 +
>>>
 +
 +
<br />
 +
=Problem 7=
 +
<br />
 +
Did you think of using '''bar3()''' in your solution for '''bar4()''' above? 
 +
<br />
 +
Write a function called '''square()''' that receives a number and returns its square.
 +
Make sure it behaves the same as the function square() used in the example below.
 +
 +
>>> square( 5 )
 +
25
 +
>>> a = 3
 +
>>> square( a )
 +
9
 +
>>> square( square( 2 ) )
 +
16
 +
>>> for i in range( 1, 5 ):
 +
        print( "square(", i, ")=", square(i) )
 +
 +
 +
square( 1 )= 1
 +
square( 2 )= 4
 +
square( 3 )= 9
 +
square( 4 )= 16
 +
>>>
 +
 +
<br />
 +
 +
=Problem 8=
 +
<br />
 +
Write a function called '''cube()''' that receives a number as a parameter, and that returns the cube of that number (or that number multiplied by itself 3 times).  Make '''cube()''' use '''square()''' when it computes its returned value.
 +
 +
>>> a = cube( 3 )
 +
>>> b = cube( 4 )
 +
>>> print( "a = ", a, " b = ", b )
 +
a =  27  b =  64
 +
 +
<br />
 +
=Problem 9=
 +
<br />
 +
Write a function called '''sumSquareCube()''' that receives a number as a parameter, and that returns the sum of the square and the cube of that number.  So, if the functions gets 3, it returns 3*3 + 3*3*3.
 +
 +
Your function '''must''' use '''square()''' and '''cube()''' that you have defined previously.
 +
 +
>>> sumSquareCube( 2 )
 +
12
 +
>>> sumSquareCube( 3 )
 +
36
 +
>>> sumSquareCube( 0 )
 +
0
 +
>>> sumSquareCube( 4 )
 +
80
 +
>>>
 +
 +
<br />
 +
=Problem 10=
 +
<br />
 +
Write a function called '''firstOf()''' that receives a list of strings as a parameter and returns the first element of the list.  You may assume that the list will always contain at least 1 element.
 +
<br />
 +
 +
>>> farm = [ "dog", "cat", "mouse", "pig" ]
 +
>>> firstOf( farm )
 +
'dog'
 +
>>> firstOf( [10, 5, 1, 20, 100] )
 +
10
 +
>>> animal = firstOf( farm )
 +
>>> print( animal )
 +
dog
 +
>>> firstOf( farm[1: ] )
 +
'cat'
 +
>>>
 +
 +
<br />
 +
=Problem 11=
 +
<br />
 +
==Preparation==
 +
<br />
 +
First play with the split() method to refresh your understanding of how it works.  Essentially it cuts strings into a list of strings using a special character or string as a divider.
 +
 +
>>> sentence = "The quick red fox jumped over the dog"
 +
>>> words = sentence.split( ' ' )
 +
>>> words
 +
???
 +
>>> sentence = "    the quick red    fox  "
 +
>>> words = sentence.split( ' ' ) # that's a space between quotes
 +
>>> words
 +
???
 +
>>> sentence
 +
'    the quick red    fox  '
 +
>>> sentence.split() # if no character is specified, splits on whitespace
 +
???
 +
>>> sentence = "Alicia,Grant,2019,Ducket"
 +
>>> words = sentence.split( ',' )
 +
>>> words
 +
????
 +
>>>
 +
 +
;Some explanations:
 +
: When you do not provide a parameter to ''split()'', it splits on groups of ''whitespace'' characters.  Whitespace characters are the space, the return character ('\n'), and the tab character.
 +
if you split on a space ' ' and the string has long groups of spaces, then you will get a list with many empty strings.  In such cases it is best to not provide anything an split on whitespace.
 +
<br />
 +
 +
==Problem==
 +
<br />
 +
Write a function called '''firstWord()''' that is given a string containing many words separated by spaces, and that returns the first word of the string.
 +
<br />
 +
 +
>>> print( "first word: ", firstWord( "Hello CSC111!" ) )
 +
first word:  Hello
 +
>>> sentence = "    The quick red fox    "
 +
>>> print( "first word: ", firstWord( sentence ) )
 +
first word:  The
 +
>>> farm = [ "dog barks", "cat hisses", "
 +
<br />
 +
 +
=Problem 12=
 +
<br />
 +
==Reviewing appending to lists==
 +
<br />
 +
You can append items to a list using the '''.append()''' method.  Play with the following example statements in the console.  Do not limit your self to just these statements.  Change them.  Try new ones...
 +
<br />
 +
 +
>>> farm = [ "dog", "pig", "hen" ]
 +
>>> farm
 +
???
 +
>>> farm.append( "cat" )
 +
>>> farm
 +
???
 +
>>> nums = [ ]
 +
>>> nums
 +
[]
 +
>>> nums.append( 3 )
 +
>>> nums
 +
???
 +
>>> nums.append( 5 )
 +
>>> nums
 +
???
 +
>>> nums.append( 10 )
 +
>>> nums
 +
???
 +
>>> tenNums = [ ]
 +
>>> for i in range( 10 ):
 +
tenNums.append( i )
 +
 +
 +
>>> tenNums
 +
???
 +
>>>
 +
 +
<br />
 +
=Problem 13=
 +
<br />
 +
Write a function called '''listFirstWords()''' that receives a list of sentences (strings with space-separated words), and returns a list of all the first words of each sentence.
 +
<br />
 +
 +
>>> parag = [ "Anna class of 18",
 +
            "Lujun class of 17",
 +
            "Vasanta class of 20" ]
 +
>>> students = listFirstWords( parag )
 +
>>> students
 +
['Anna', 'Lujun', 'Vasanta']
 +
>>> for stu in students: 
 +
print( stu )
 +
 +
 +
Anna
 +
Lujun
 +
Vasanta
 +
>>>
 +
 +
<br />
 +
=Moodle Submission=
 +
<br />
 +
{| style="width:100%; background:silver"
 +
|-
 +
|
 +
 +
===Challenge Of the Day===
 +
|}
 +
[[Image:QuestionMark5.jpg|right|120px]]
 +
 +
:* Put your function '''listFirstWords()''' in a file called lab6_13.py, and submit it on Moodle in the Lab 6 section.  If your function listFirstWords() uses other functions you have created, such as '''firstWord.py''', make sure you include them in your program as well!  Do not '''call''' your function
 +
<br />
 +
<br />
 +
<br />
 +
</onlydft>
 +
<showafterdate after="20180310 06:00" before="20180601 00:00">
 +
 +
=Solution Program=
 +
<br />
 +
::<source lang="python">
 +
# lab6Solution.py
 +
# D. Thiebaut
 +
 +
def bar():
 +
    print( 30 * '#' )
 +
 +
def bar2( numChar ):
 +
    print( numChar * '#' )
 +
 +
def bar3( numChar, ch ):
 +
    print( numChar * ch )
 +
 +
def bar4( numLines, numChar, ch ):
 +
    for i in range( numLines ):
 +
        bar3( numChar, ch )
 +
 +
def square( x ):
 +
    return x * x
 +
 +
def cube( x ):
 +
    # return x * x * x
 +
    return square( x ) * x
 +
 +
def sumSquareCube( x ):
 +
    return square( x ) + cube( x )
 +
 +
def firstOf( list1 ):
 +
    return list1[0]
 +
 +
def firstWord( string ):
 +
    words = string.split()
 +
    return words[0]
 +
 +
def listFirstWords( paragraph ):
 +
    lines = paragraph.split( "\n" )
 +
    first = [ ]
 +
    for line in lines:
 +
        first.append( firstWord( line ) )
 +
    return first
 +
 +
def main():
 +
    bar()
 +
    bar2( 10 )
 +
    bar2( 1 )
 +
    bar2( 5 )
 +
    bar3( 6, 'a' )
 +
    bar3( 1, '#' )
 +
    bar3( 5, '-o' )
 +
 +
    for i in range( 1, 5 ):
 +
        bar3( i, '+' )
 +
 +
    symbols = [ '#', '+', 'o', '$' ]
 +
    for i in range( len( symbols ) ):
 +
        bar3( i+1, symbols[i] )
 +
       
 +
    bar4( 3, 10, '#' )
 +
 +
    for i in range( 1, 5 ):
 +
        print( "square(", i, ")=", square(i) )
 +
 +
    print( "sumSquareCube(", 3, ")=",
 +
          sumSquareCube( 3 ) )
 +
   
 +
    farm = ["dog", "hen", "pig", "duck" ]
 +
    animal = firstOf( farm )
 +
    print( "first animal = ", animal )
 +
 +
    word = firstWord( "hello there CSC111!" )
 +
    print( "first word=", word )
 +
 +
    sentence = "  the quick red fox  "
 +
    word = firstWord( sentence )
 +
    print( "first word=", word )
 +
 +
    parag = """Anna class of 18
 +
              Lujun class of 17
 +
              Vasanta class of 20"""
 +
    students = listFirstWords( parag )
 +
    print( "students = ", students )
 +
   
 +
main()
 +
 +
</source>
 +
</showafterdate>
 +
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[[Category:Python]][[Category:Labs]][[Category:CSC111]]

Latest revision as of 12:57, 1 June 2018

D. Thiebaut (talk) 12:27, 4 March 2018 (EST)


...

<showafterdate after="20180310 06:00" before="20180601 00:00">

Solution Program


# lab6Solution.py
# D. Thiebaut

def bar():
    print( 30 * '#' )

def bar2( numChar ):
    print( numChar * '#' )

def bar3( numChar, ch ):
    print( numChar * ch )

def bar4( numLines, numChar, ch ):
    for i in range( numLines ):
        bar3( numChar, ch )

def square( x ):
    return x * x

def cube( x ):
    # return x * x * x
    return square( x ) * x

def sumSquareCube( x ):
    return square( x ) + cube( x )

def firstOf( list1 ):
    return list1[0]

def firstWord( string ):
    words = string.split()
    return words[0]

def listFirstWords( paragraph ):
    lines = paragraph.split( "\n" )
    first = [ ]
    for line in lines:
        first.append( firstWord( line ) )
    return first

def main():
    bar()
    bar2( 10 )
    bar2( 1 )
    bar2( 5 )
    bar3( 6, 'a' )
    bar3( 1, '#' )
    bar3( 5, '-o' )

    for i in range( 1, 5 ):
        bar3( i, '+' )

    symbols = [ '#', '+', 'o', '$' ]
    for i in range( len( symbols ) ):
        bar3( i+1, symbols[i] )
        
    bar4( 3, 10, '#' )

    for i in range( 1, 5 ):
        print( "square(", i, ")=", square(i) )

    print( "sumSquareCube(", 3, ")=",
           sumSquareCube( 3 ) )
    
    farm = ["dog", "hen", "pig", "duck" ]
    animal = firstOf( farm )
    print( "first animal = ", animal )

    word = firstWord( "hello there CSC111!" )
    print( "first word=", word )

    sentence = "  the quick red fox   "
    word = firstWord( sentence )
    print( "first word=", word )

    parag = """Anna class of 18
              Lujun class of 17
              Vasanta class of 20"""
    students = listFirstWords( parag )
    print( "students = ", students )
    
main()

</showafterdate>


















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