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@ -5,7 +5,7 @@ tags: list,beginner
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Checks if all elements in a list are equal.
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Checks if all elements in a list are equal.
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- Use `set()` to eliminate duplicate elements and then use `len()` to check if length is 1.
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- Use `set()` to eliminate duplicate elements and then use `len()` to check if length is `1`.
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```py
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```py
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def all_equal(lst):
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def all_equal(lst):
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18
snippets/index_of_all.md
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18
snippets/index_of_all.md
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---
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title: index_of_all
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tags: list,intermediate
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---
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Returns a list of indices of all the occurrences of an element in a list.
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- Use `enumerate()` and a list comprehension to check each element for equality with `value` and adding `i` to the result.
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```py
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def index_of_all(lst, value):
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return [i for i, x in enumerate(lst) if x == value]
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```
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```py
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index_of_all([1, 2, 1, 4, 5, 1], 1) # [0, 2, 5]
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index_of_all([1, 2, 3, 4], 6) # []
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```
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---
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title: indices_of_occurrence
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tags: list,beginner
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---
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Returns a list of indices of all the occurrences of an element in a list.
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- Use `enumerate()` to get index and value simultaneously while iterating.
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- Use `==` to check equality, if current element `val` is equal to `value`. Then `idx` to list.
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```py
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def indices_of_occurrence(lst, value):
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return [idx for idx, val in enumerate(lst) if val == value]
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```
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```py
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indices_of_occurrence([1, 2, 1, 4, 5, 1], 1) # [0, 2, 5]
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indices_of_occurrence([1, 2, 3, 4], 6) # []
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```
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