where i use a key value pair in a for loop, assign each to a separate variable

[lgutter]

where i use a key value pair in a for loop, assign each to a separate variable, so i don't have to use item[0] and item[1].
the indexing is not clear, and it simplifies the handling of the for loop.

[lgutter]

to clarify, change this:

for item in config['transitions']:
    if item[0] not in foo:
        do something
    if item[1] in bar:
        do something

to this:

for (key, value) in config['transitions']:
    if key not in foo:
        do something
    if value in bar:
        do something