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Python: Find the index of the last element in the given list that satisfies a testing function

Python List: Exercise - 235 with Solution

Write a Python program to find the index of the last element in the given list that satisfies the provided testing function.

Sample Solution:

Python Code:

def find_last_index(lst, fn):
  return len(lst) - 1 - next(i for i, x in enumerate(lst[::-1]) if fn(x))

print(find_last_index([1, 2, 3, 4], lambda n: n % 2 == 1))

Sample Output: 

2

Flowchart:

Flowchart: Find the index of the last element in the given list that satisfies a testing function.

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Python Code Editor:

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Python: Tips of the Day

Returns True if the provided function returns True for every element in the list, False otherwise:

Example:

def tips_every(lst, fn=lambda x: x):
  return all(map(fn, lst))

print(tips_every([2, 4, 3], lambda x: x > 1))
print(tips_every([1, 2, 3]))

Output:

True
True