[issue43581] array assignment error

John Cena added the comment: You are actually creating 4 references to the same list(See the ending *4). This is how python behaves. See the below link as well https://stackoverflow.com/questions/240178/list-of-lists-changes-reflected-across-sublists-unexpectedly -- nosy: +crazyguyx4

[issue43581] array assignment error

Change by Raymond Hettinger : -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker ___ ___ Pyt

[issue43581] array assignment error

Karthikeyan Singaravelan added the comment: By using * 4 in the end you are making four lists having same reference. Hence change in one causes change in other 4 lists. Relevant FAQ : https://docs.python.org/3/faq/programming.html#how-do-i-create-a-multidimensional-list -- nosy: +xt

[issue43581] array assignment error

Vedran Čačić added the comment: All three words in the title are wrong. :-D -- nosy: +veky ___ Python tracker ___ ___ Python-bugs-li

[issue43581] array assignment error

New submission from Wen Hao : >>>mat = [[0]*4]*4 >>> mat [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]] >>> mat[1][2]=1 >>> mat [[0, 0, 1, 0], [0, 0, 1, 0], [0, 0, 1, 0], [0, 0, 1, 0]] -- components: Build messages: 389230 nosy: haowenqi.zz priority: normal severity: normal st