[Solved] How to remove the last comma?

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If you want to do it your way:

for i in range(1, 21):
    print(i, end="," if i!=20 else "" )

Output:

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20

But a better way of doing this would be:

print(*range(1, 21), sep=",")

solved How to remove the last comma?