How do I iterate over a list in reverse in Python? See also: How can I get a reversed copy of a list (avoid a separate statement when chaining a method after .reverse)?

128 Use break and continue to do this. Breaking nested loops can be done in Python using the following:

While PEP 315 might seem related, that proposal is not for a do while loop as found in most other languages: looped statements both precede and follow the while statement. No wonder it was rejected.

Get loop count inside a for-loop [duplicate] Asked 15 years, 5 months ago Modified 3 years, 7 months ago Viewed 654k times

1366 Using a for loop, how do I access the loop index, from 1 to 5 in this case? Use enumerate to get the index with the element as you iterate:

'for' loop in one line in Python [duplicate] Asked 7 years, 2 months ago Modified 4 years, 3 months ago Viewed 184k times

Oct 20, 2011 · I believe the most simple and efficient way to loop through DataFrames is using numpy and numba. In that case, looping can be approximately as fast as vectorized operations in many cases.

How to loop backwards in python? [duplicate] Asked 15 years, 4 months ago Modified 7 years, 3 months ago Viewed 777k times

But for a more complicated loop you may want to flatten it by iterating over a well-named generator expression and/or calling out to a well-named function. Trying to fit everything on one line is rarely …

60 You should also know that in Python, iterating over integer indices is bad style, and also slower than the alternative. If you just want to look at each of the items in a list or dict, loop directly through the …