Function Detective

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Function Detective

The questions below are based on the Python program below and its output. You haven't seen some of these Python statements and constructs before, we're hoping you can reason about them from the code and the program output

Input file is words.txt:
phone
book
baby
punch
fox
elf
country
sun

Code here:

def pluralize(word):
ret = word + "s"
if word.endswith("ch"):
ret = word + "es"
if word.endswith("x"):
ret = word + "es"
if word.endswith("f"):
ret = word[:-1] + "ves"
if word.endswith("y"):
ret = word[:-1] + "ies"
return ret

if __name__ == "__main__":
f = open("words.txt")
for w in f:
w = w.strip()
print w, pluralize(w)

output here

phone phones
book books
baby babies
punch punches
fox foxes
elf elves
country countries
sun suns

Based on the output for the word "elf" and "country", which do you think is the best explanation of the python operator [:-1] when it's applied to a string? *

It creates a new string without the last letter of the original string

it evaluates to a number that is one less than the length of the original string

it creates a new string without the first letter of the original string

it generates an error because you can't subtract a number from a string

Which of the following is the best explanation for the code 'for w in f:'

this code is in the 'main' program block

it loops over the words from the file words.txt

it loops over the lines from the file words.txt

it loops over words from a website that has determined are good candidates for passing to function pluralize

it loops over words entered by the user

Clear selection

Enter a word for which you think function pluralize will return an incorrect plural *

Which of the following is the best explanation for the first statement in function pluralize: *

ret = word + "s"

variables should be initialized when they're defined

English rules of grammar require forming plurals in two steps: using a two-step strategy in Python mirrors the grammar rules

This sets ret to an option that works most of the time, except in special cases checked for in the rest of pluralize

The variable ret is returned as the last statement of the function, so it's initialized as the first statement

Name(s) comma separated, first and last *

netid *

netid (partner, optional)

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