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python/snippets/index-of-all.md

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+---
+title: All indexes of value
+type: snippet
+tags: [list]
+cover: purple-flower-bunch
+dateModified: 2020-10-11T13:45:19+03:00
+---
+
+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) # []
+```