pythonloopslist

How can I access the index value in a 'for' loop?

How do I access the index while iterating over a sequence with a for loop?

xs = [8, 23, 45]

for x in xs:
    print("item #{} = {}".format(index, x))

Desired output:

item #1 = 8
item #2 = 23
item #3 = 45
Solution

  • Use the built-in function enumerate():

    for idx, x in enumerate(xs):
    print(idx, x)

    It is non-Pythonic to manually index via for i in range(len(xs)): x = xs[i] or manually manage an additional state variable.

    Check out PEP 279 for more.