Reverse / invert a dictionary mapping
Python 3+: inv_map = {v: k for k, v in my_map.items()} Python 2: inv_map = {v: k for k, v in my_map.iteritems()}
reverse
Traverse a list in reverse order in Python [duplicate]
Use the built-in reversed() function: >>> a = [“foo”, “bar”, “baz”] >>> for i in reversed(a): … print(i) … baz bar foo To also access the original index, use enumerate() on your list before passing it to reversed(): >>> for i, e in reversed(list(enumerate(a))): … print(i, e) … 2 baz 1 bar 0 foo Since … Read more