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Practice Exam for CS2370 Spring 2024 #

Type your answers below the questions and submit the resulting file on Inkfish.

Part 1. Write down a literal value of each of the following types: #

String

Integer

Float

List of Floats

Set of Integers

A Tuple of an Integer and a String

Part 2. Design Recipe #

Consider the following code and answer the questions below.

def string_lengths(xs):
    ys = []
    for x in xs:
        ys.append(len(x)
    return ys

assert([3, 5] == string_lengths(["one", "seven"]))

# [Int] -> Int
# Sum all the even numbers in the list.
def sum_evens(xs):
    pass

assert(6 == sum_evens[1,2,3,4])

What is the signature of string_lengths?

What is an appropriate purpose statement for string_lengths?

What is the standard pattern for sum_evens?

What is the complete code for sum_evens?

Part 3: Classes and Scopes #

Consider the following code and answer the questions below.

color = "blue"
rank = 2

class Bar:
    color = "red"
    rank = 6 

    def triple(self):
        return 3 * rank

def foo():
    color = "green"

    class Baz(Bar):
        def double(self):
            return 2 * self.rank

        def grape(self):
            global color

            return "My favorite color is " + color


    return Baz()

aa = foo()
bb = Bar()

print(aa.double())   # print #1
print(aa.triple())   # print #2
print(aa.grape())    # print #3
print(bb.triple())   # print #4

What’s the output from print #1?

What’s the output from print #2?

What’s the output from print #3?

What’s the output from print #4?

Part 4. Regular Expressions #

Hints:

  • \d is [0-9]
  • \w is [a-zA-Z0-9_]
  • \s is any whitespace character
  • . is any character
  • + means one or more
  • mm[0] is the whole match
  • mm[1] is the first group (set of parens)

Consider the following code and answer the questions below

import re

alice = "Alice Anderson"
bob = "Robert C. Boulette"


pat = r'^(\w+)\s+(\w\.)\s+(\w+)'

mm = re.search(pat, alice)
if mm:
    print(mm[1]) # Print #1

mm = re.search(pat, bob)
if mm:
    print(mm[1]) # Print #2

Does the pattern match alice?

If so, what gets printed by print #1?

Does the pattern match bob?

If so, what gets printed by print #2?