19 lines
441 B
Markdown
19 lines
441 B
Markdown
---
|
|
title: index_of_all
|
|
tags: list,intermediate
|
|
---
|
|
|
|
Returns a list of indexes of all the occurrences of an element in a list.
|
|
|
|
- Use `enumerate()` and a list comprehension to check each element for equality with `value` and adding `i` to the result.
|
|
|
|
```py
|
|
def index_of_all(lst, value):
|
|
return [i for i, x in enumerate(lst) if x == value]
|
|
```
|
|
|
|
```py
|
|
index_of_all([1, 2, 1, 4, 5, 1], 1) # [0, 2, 5]
|
|
index_of_all([1, 2, 3, 4], 6) # []
|
|
```
|