Append to a list in python for loop

Asked Dec 29 '22 at 23:10

Active Dec 29 '22 at 23:10

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I am tring to populate both matrix_of_ones and inner_matrix inside a for loop but the final matrix is not what i expect. I expect matrix_of_ones to be equal expected_for_loop_output after the for loop is finished executing but the for loop actually generates actual_for_loop_output below. Could someone please why this is so?

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I expect matrix_of_ones to be equal expected_for_loop_output after the for loop is finished executing but the for loop actually generates actual_for_loop_output.

asked Dec 29 '22 at 23:10

Mick G

3

Don't post images of code. Post the code. – Tom Karzes Dec 29 '22 at 23:13
1

You keep appending the same list after making changes to it, so you end up with 3 copies of the final version. – Scott Hunter Dec 29 '22 at 23:14
See the duplicate answer. When you have multiple references to the same list, changing one of those lists changes them all (since there's only one). – Tom Karzes Dec 29 '22 at 23:15
Next time, try to run in the visual platform to see what's happening each step - https://pythontutor.com/ – Daniel Hao Dec 29 '22 at 23:24

Append to a list in python for loop

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