How to update a variable after a loop using list comprehension-CodePudding

I have a code that print something like:

N, M = map(int,input().split())
x='.|.'
j=1
for i in range(N):
    print((x*j).center(M,'-'))
    j =2

I have tried to shorten the code by using list comprehension:

[print((x*j).center(M,'-')) for i in range(N)]

How can I update the variable j for each loop? Thanks.

CodePudding user response：

I have worked around the problem using this:

[print((x*(1 i*2)).center(M,'-')) for i in range(N)]

This solution maybe short but I think it's not ideal for developing.

CodePudding user response：

Why use i in a for loop when you could just use j?

for j in range(1, N, 2):
    print( (x*j).center(M, '-') )

This is sufficiently short, and consistent with the comments which correctly state that a list comprehension is used to build a list in a more condensed format, rather than be used whenever possible to use one less line of code.