Loop backwards using indices in Python?

python loops

Try range(100,-1,-1), the 3rd argument being the increment to use (documented here).

("range" options, start, stop, step are documented here)

python loops

In my opinion, this is the most readable:

for i in reversed(xrange(101)):    print i,

python loops

for i in range(100, -1, -1)

and some slightly longer (and slower) solution:

for i in reversed(range(101))for i in range(101)[::-1]

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