Python List Comprehension Practice Problems

lc-practice.py

def identity(nums):
    """Identity:

    Given a list of numbers, write a list comprehension that produces a copy of the list.

        >>> identity([1, 2, 3, 4, 5])
        [1, 2, 3, 4, 5]

        >>> identity([])
        []
    """
    pass



def doubled(nums):
    """Doubled:

    Given a list of numbers, write a list comprehension that produces a list of each number doubled.

        >>> doubled([1, 2, 3, 4, 5])
        [2, 4, 6, 8, 10]

        >>> doubled([-2, 2, -10, 10])
        [-4, 4, -20, 20]
    """
    pass



def squared(nums):
    """Squared:

    Given a list of numbers, write a list comprehension that produces a list of the squares of each number.

        >>> squared([1, 2, 3, 4, 5])
        [1, 4, 9, 16, 25]

        >>> squared([-2, 2, -10, 10])
        [4, 4, 100, 100]
    """
    pass



def evens(nums):
    """Evens:

    Given a list of numbers, write a list comprehension that produces a list of only the even numbers in that list.

        >>> evens([1, 2, 3, 4, 5])
        [2, 4]

        >>> evens([1, 3, 5])
        []

        >>> evens([-2, -4, -7])
        [-2, -4]
    """
    pass



def odds(nums):
    """Odds:

    Given a list of numbers, write a list comprehension that produces a list of only the odd numbers in that list.

        >>> odds([1, 2, 3, 4, 5])
        [1, 3, 5]

        >>> odds([2, 4, 6])
        []

        >>> odds([-2, -4, -7])
        [-7]
    """
    pass



def positives(nums):
    """Positives:

    Given a list of numbers, write a list comprehension that produces a list of only the positive numbers in that list.

        >>> positives([-2, -1, 0, 1, 2])
        [1, 2]
    """
    pass



def selective_stringify_nums(nums):
    """Selectively stringify nums:

    Given a list of numbers, write a list comprehension that produces a list of strings of each number that is divisible by 5.

        >>> selective_stringify_nums([25, 91, 22, -7, -20])
        ['25', '-20']
    """
    pass



def words_not_the(sentence):
    """Words not 'the'

    Given a sentence, produce a list of the lengths of each word in the sentence, but only if the word is not 'the'.

        >>> words_not_the('the quick brown fox jumps over the lazy dog')
        [5, 5, 3, 5, 4, 4, 3]
    """
    pass



def vowels(word):
    """Vowels:

    Given a string representing a word, write a list comprehension that produces a list of all the vowels in that word.

        >>> vowels('mathematics')
        ['a', 'e', 'a', 'i']
    """
    pass



def vowels_set(word):
    """Vowels set:

    Given a string representing a word, write a set comprehension that produces a set of all the vowels in that word.

        >>> vowels_set('mathematics')
        set(['a', 'i', 'e'])
    """
    pass



def disemvowel(sentence):
    """Disemvowel:

    Given a sentence, return the sentence with all vowels removed.

        >>> disemvowel('the quick brown fox jumps over the lazy dog')
        'th qck brwn fx jmps vr th lzy dg'
    """
    pass



def wiggle_numbers(nums):
    """Wiggle numbers:

    Given a list of number, return the list with all even numbers doubled, and all odd numbers turned negative.

        >>> wiggle_numbers([72, 26, 79, 70, 20, 68, 43, -71, 71, -2])
        [144, 52, -79, 140, 40, 136, -43, 71, -71, -4]
    """
    pass



def encrypt_lol(sentence):
    """Encrypt lol:

    Given a sentence, return the setence will all it's letter transposed by 1 in the alphabet, but only if the letter is a-y.

        >>> encrypt_lol('the quick brown fox jumps over the lazy dog')
        'uif rvjdl cspxo gpy kvnqt pwfs uif mbzy eph'
    """
    pass



# STOP HERE! You solved everything!
if __name__ == '__main__':
    import doctest
    if doctest.testmod().failed == 0:
        print '\n*** ALL TESTS PASSED!\n'

Thanks, the exercises were pretty easy.

Thanks for this exercise .... !!!!!

Thanks!!

First, I'd like to say thank you for the exercises. I had no knowledge of the isspace(), ord() and chr() functions before starting this.

I'd also like to point out that the correct output for encrypt_lol should be
'uif rvjdl cspxo gpy kvnqt pwfs uif mbzz eph'
The answer provided in the comments doesn't have the "y" from lazy shifted to "z".

It'd also be cool if you or someone else provided a separate answer sheet. I think I over complicated a few of my answers.
Thanks again for the exercises!

@BigDru

I have provided the answers on my Github Gist, which can be accessed by clicking on my profile.

or

Link: https://gist.github.com/the-rahulpatel/c7c010ef7a16dd4f2b09cbe6d582ec06

Thanks a lot for the exercises, they are of gold value!

P.S: I would like to note a problem with the last exercise you proposed. In the statement it says "a-y" but in the provided output there is no change on the "y" element. (last character of the word "lazy").

Thanks a lot for sharing this informative exercise. Got to learn a bit

Thanks for the practice problems.
I have written the programs for all the Questions to best of my beginner knowledge, hope someone get's used my this
Link: https://gist.github.com/Just-Simple-59/8e908575fe138e8fca58982df4f6c397

Thanks for the help. It was really helpful

…

On Tue, 22 Jun 2021, 11:29 pm PRASHANTH V, ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Thanks for the practice problems. I have written the programs for all the Questions to best of my beginner knowledge, hope someone get's used my this Link: https://gist.github.com/Just-Simple-59/8e908575fe138e8fca58982df4f6c397 — You are receiving this because you commented. Reply to this email directly, view it on GitHub <https://gist.github.com/cb50d9e4d344230ebc166255a202f81d#gistcomment-3789242>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATZMBONBCFXCE6CAOY2GHTTTUDFQDANCNFSM4OUFDWDQ> .