CODEWITHSUNDEEP
pythonlistprefix
Rassoha
Rassoha

Reputation: 1

why do prefixes in an array have no effect?

solving a problem in leetcode, I needed to create a matrix and take data from another matrix, for this I wrote res[0][0]=s[0][0], but for some reason Python assigned all res[0-2][0] values ​​to s[0][0]

s= [[-2,-3,3],[-5,-10,1],[10,30,-5]]
res=[[0]*len(s)]*len(s[0])
res[0][0]=s[0][0]
print(res)

output: [[-2, 0, 0], [-2, 0, 0], [-2, 0, 0]] but i want [[-2, 0, 0], [0, 0, 0], [0, 0, 0]]

s= [[-2,-3,3],[-5,-10,1],[10,30,-5]]
res=[[0]*len(s)]*len(s[0])
res[1][0]=s[0][0]
print(res)

output: [[-2, 0, 0], [-2, 0, 0], [-2, 0, 0]]

Upvotes: 0

Views: 26

Answers (0)

Related Questions