5.26. Functions and Conditionals Multiple Choice Questions

Q-1: Which of following uses the correct syntax for a python if statement?

• if (x = y):
• Try again! An if statement shouldn't contain an assignment operator.
• if (x == y):
• Correct!
• if !(x is not y):
• Try again! The not operator (!) can't be used in python.
• if x = y:
• Try again! An if statement shouldn't contain an assignment operator.
• if x == y:
• Correct!

Q-2: Which of the following tests if 5 exponentiated to the 4th power is greater than y and less than or equal to z?

• z >= 5**4 > y
• Correct! Note that compound statements are allowed in python.
• 5**4 > y and (5**4 < z or 5**4 == z)
• Correct! Note that the and operator comes before the or operator in operator precedence.
• 5**4 > y and <= z
• Try again! Nothing is being compared to z.
• 5**4 > y and 5**4 < z or 5**4 == z
• Try again! The and operator comes before the or operator in operator precedence.
• 5**4 > y and z >= 5**4
• Correct! Note that z >= 5**4 is the same as 5**4 <= z.

Q-3: Which of the following statements completes the function and returns True if one’s age is greater than or equal to 16?

def days_to_age(days):
    # what line goes here?
        return True
    else:
        return False

• if days / 365 == 16 or 16 < days / 365:
• Correct! Note that (16 < days / 365) is the same as (days / 365 > 16).
• if (days / 365 = 16) or (16 < days / 365):
• Try again! The assignment operator (=) should not be in the if statement.
• if days / 365 >= 16:
• Correct!
• if 365 / days >= 16:
• Try again! To convert days to age, you divide days by 365.
• if (days / 365 == 16) and (days / 365 > 16):
• Try again! One's age can't be 16 and greater than 16.

Q-4: Which of the following properly expresses the precedence of operators (using parentheses) in the following expression: 10 > y or x + y == 10 and x is not y? Might be best to try on paper first.

• (((10 > y) or (x + y == 10)) and (x is not y))
• Try again! The precedence of the operators is incorrect.
• (10 > (y or x) + y == (10 and x) is not y)
• Try again! The precedence of the operators is incorrect.
• (10 > y or x + y == 10 and x is not y)
• Try again! The precedence of the operators is incorrect.
• ((10 > y) or (((x + y) == 10) and (x is not y)))
• Correct! Parentheses should be added in the following order: (x + y), (x is not y), (10 > y), ((x + y) == 10), (((x + y) == 10) and (x is not y)), ((10 > y) or (((x + y) == 10) and (x is not y))).
• (((10 > y) or ((x + y) == 10)) and (x is not y))
• Try again! The precedence of the operators is incorrect.

Q-5: What would be the outputs for transform_string('green'), transform_string('door'), and transform_string('mountains') in order? (Note: Ignore whitespaces.)

def transform_string(word):
    if len(word) <= 5:
        new_letters = word[1:3].upper()
        if new_letters[0] == new_letters[1]:
            print(new_letters)
        else:
            print("Letters don't match.")
    else:
        new_chars = word[-3:]
        print(new_chars)
    print('Done.')

• LETTERS DON'T MATCH. Done. oo Done. i Done.
• Try again! LETTERS DON'T MATCH shouldn't be all uppercase, oo should be all uppercase, and i is missing characters.
• EEN. Done. OO Done. ins Done.
• Try again! EEN is incorrect.
• Letters don't match. Done. OO Done. ins Done.
• Correct!
• Letters don't match. OO ins Done.
• Try again! "Done." is missing twice.
• RE OO in Done.
• Try again! RE is incorrect, "Done." is missing twice, and in is missing a character.

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