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  1. #1
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    Python List Comprehension Error: Unexpected Output

    I'm encountering an unexpected output while using list comprehension in Python. I'm trying to create a list of squared values for even numbers in a given range, but the result is not what I anticipated. Here's the code I'm using:

    Code:
    even_numbers = [x for x in range(10) if x % 2 == 0]
    squared_values = [x**2 for x in even_numbers]
    
    print(squared_values)
    I expected the output to be [0, 4, 16, 36, 64], but instead, I'm getting [0, 4, 16]. It seems like the last even number (8) and its corresponding squared value (64) are missing.

    Can someone help me understand why this is happening and how to correct my list comprehension code to get the desired output? Is there something I'm overlooking in my approach? Your insights would be greatly appreciated. Thank you!

  2. #2
    Join Date
    Aug 2023
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    Re: Python List Comprehension Error: Unexpected Output

    Quote Originally Posted by Nathan D View Post
    I'm encountering an unexpected output while using list comprehension in Python. I'm trying to create a list of squared values for even numbers in a given range, but the result is not what I anticipated. Here's the code I'm using:

    Code:
    even_numbers = [x for x in range(10) if x % 2 == 0]
    squared_values = [x**2 for x in even_numbers]
    https://betandreas-ozbekiston.net/
    print(squared_values)
    I expected the output to be [0, 4, 16, 36, 64], but instead, I'm getting [0, 4, 16]. It seems like the last even number (8) and its corresponding squared value (64) are missing.

    Can someone help me understand why this is happening and how to correct my list comprehension code to get the desired output? Is there something I'm overlooking in my approach? Your insights would be greatly appreciated. Thank you!

    The reason why you are getting the unexpected output is because the list comprehension for squared_values is nested inside the list comprehension for even_numbers. This means that the squared_values list is created based on the values of the even_numbers list, which only goes up to 6.
    Last edited by smylit45; September 14th, 2023 at 02:57 AM.

  3. #3
    2kaud's Avatar
    2kaud is online now Super Moderator Power Poster
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    Re: Python List Comprehension Error: Unexpected Output

    That code works for me:

    [output]
    >>> even_numbers = [x for x in range(10) if x% 2 == 0]
    >>> squared_values = [x**2 for x in even_numbers]
    >>> print(squared_values)
    [0, 4, 16, 36, 64]
    >>>
    [/output]
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++23 Compiler: Microsoft VS2022 (17.6.5)

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