Python: Find the value of the first element in the given list that satisfies the provided testing function
Python List: Exercise - 239 with Solution
Write a Python program to find the value of the first element in the given list that satisfies the provided testing function.
Use a list comprehension and next() to return the first element in lst for which fn returns True.
Sample Solution:
Python Code:
def find(lst, fn):
return next(x for x in lst if fn(x))
print(find([1, 2, 3, 4], lambda n: n % 2 == 1))
print(find([1, 2, 3, 4], lambda n: n % 2 == 0))
Sample Output:
1 2
Flowchart:

Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Python Code Editor:
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: Write a Python program to calculate the average of a given list, after mapping each element to a value using the provided function.
Next: Write a Python program to find the value of the last element in the given list that satisfies the provided testing function.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Python: Tips of the Day
Chunks a list into smaller lists of a specified size:
Example:
from math import ceil def tips_chunk(lst, size): return list( map(lambda x: lst[x * size:x * size + size], list(range(0, ceil(len(lst) / size))))) print(tips_chunk([1, 2, 3, 4, 5, 6], 3))
Output:
[[1, 2, 3], [4, 5, 6]]
- Weekly Trends
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises