﻿ Python: Find the indexes of all elements in the given list that satisfy the provided testing function - w3resource

# Python: Find the indexes of all elements in the given list that satisfy the provided testing function

## Python List: Exercise - 230 with Solution

Write a Python program to find 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.

Sample Solution:

Python Code:

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

Sample Output:

```[0, 2]
```

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## Python: Tips of the Day

Decapitalizes the first letter of a string:

Example:

```def tips_decapitalize(s, upper_rest=False):
return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:])
print(tips_decapitalize('PythonTips'))
print(tips_decapitalize('PythonTips', True))
```

Output:

```pythonTips
pYTHONTIPS
```

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