Find all the indexes of a number in a list

Question

I have the following list:

lista = [1,2,3,5,0,5,6,0]

I know that print(lista.index(0)) will print the first index where it found the number i.e. 4

How do I get it to print the next index which should be 7 etc?

Answer 1

The classic way is to build a list of the indices:

eg:

>>> indices = [i for i, v in enumerate(a) if v == 0]
>>> print indices
[4, 7]

Of course - this can be turned into a generator expression instead. But in short - using enumerate is what you're after.