Python Sorting Data for loop and if statement

Question

data = ['cat', 'dog', 'None', 'Turtle', 'None']
new_data = []
for item in data:
    if item == 'None':
        new_data.append(data.index(item))
print new_data

>> [2,2]

How do I go about getting to this store new data as [2,4]? This is what I want. Thank you!

Answer 1

Use enumerate() while looping. This will track both, the current item and its index:

[index for index, x in enumerate(data) if x == "None"]