# Find all matching indexes

Finds the indexes of all elements in the given list that satisfy the provided testing function.

- Use
`enumerate()`

and a list comprehension to return the indexes of the all element in`lst`

for which`fn`

returns`True`

.

def find_index_of_all(lst, fn): return [i for i, x in enumerate(lst) if fn(x)] find_index_of_all([1, 2, 3, 4], lambda n: n % 2 == 1) # [0, 2]