CSC111 Mid-Semester Review 2018

D. Thiebaut (talk) 19:17, 4 March 2018 (EST)

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Preparation

• We'll use a clicker (The Answer-Pad) during this review. Go to http://app.theanswerpad.com/student to answer various questions.

Format

• What is printed by this statement?

print( "({0:3}) {1:3}-{2:4}".format( "413", "584", "3854" ) )

• What is output by this statement?

print( "({0:1}) {1:1}-{2:1}".format( "413", "584", "3854" ) )

• What is output by this statement?

print( "({1:3}) {0:3}-{2:4}".format( "413", "584", "3854" ) )

Range

• Is range a function?
• How many parameters does it take?
• What are they?
• Can range crash if we give it incompatible parameters?
• Can its parameters be variables? i.e. range( a, b, c)?
• When is range() useful?

Lists

• How are lists defined?
• What different symbols are used to define lists?
• Can we mix the symbols to open and close the list?
• Can lists be empty? If so, give examples of empty lists.
• Can list elements be of different types? Can a list element be another list?
• Can list grow? How?
• How can we replace the first element of a non-empty list with a different value?
• How can we remove the first element of a non-empty list?
• How can we remove the last element of a non-empty list?
• How can we create a list that is the concatenation of two lists?

Strings

• Are strings mutable?
• is

a = ""

a valid string?

• How can we remove the first letter of a non-empty string?
• How can we remove the last letter of a non-empty string?
• How can we create the reverse of a string ("hello" --> "olleh")
• How do we go from "The quick red fox" to [ "The", "quick", "red", "fox"]?
• How do we go from " The quick red fox " to [ "The", "quick", "red", "fox"]?
• How do we print the first word of a sentence, i.e. extract "Viva" from the string "Viva Fresh Pasta"?
• Give the name of 5 string methods

Functions

• Is this function valid (i.e. Python will not report an error if it finds it in our program)?

 def doNothing( a ):
     return 1

• What is None?
• Is this function valid?

 def doNothing2( a ):
     return

• The output of this program is 7. What did the user enter?

def f1( a, b ):
    return a - b

x = eval( input( "> " ) )
print( f1( x, 3 ) )

• The output of this program is 5. What did the user enter?

def f2( y, x ):
    return y - x

x = eval( input( "> " ) )
y = 10
print( f2( x, y ) )

• What is printed by the program?

def f2( y, x ):
    z = 4
    return y - x

print( f2( 5, 3 ) )
print( z )