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Python: Check if a given function returns True for at least one element in the list

Python List: Exercise - 259 with Solution

Write a Python program to check if a given function returns True for at least one element in the list.

Use all() and fn to check if fn returns False for all the elements in the list.

Sample Solution:

Python Code:

def test(lst, fn = lambda x: x):
  return all(not fn(x) for x in lst)
print(test([1, 0, 2, 3], lambda x: x >= 3 ))
print(test([1, 0, 2, 3], lambda x: x < 0 ))
print(test([2, 2, 4, 4]))

Sample Output:

False
True
False

Flowchart:

Flowchart: Check if a given function returns True for at least one element in the list.

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Python Code Editor:

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Previous: Write a Python program to create a given flat list of all the keys in a flat dictionary.
Next: Write a Python program to check if all the elements of a list are included in another given list.

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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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