Python all() Function

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Python all() Function

The python all() function accepts an iterable object (such as list,dictionary etc.). It returns True if all items in passed iterable are true, otherwise it returns False. If the iterable object is empty, the all() function returns True.

Signature

- iterable – The objects which contain the elements i.e. list, tuple and dictionary, etc.
Return
- True – If all the elements in an iterable are true.
- False – If all the elements in an iterable are false..
Python all() Function Example 1

Let’s see how all() works for lists?
- # all values true
  k = [1, 3, 4, 5]
  print(all(k))
  
  # all values false
  k = [0, False]
  print(all(k))
  
  # one false value
  k = [1, 3, 4, 0]
  print(all(k))
  
  # one true value
  k = [0, False, 5]
  print(all(k))
  
  # empty iterable
  k = []
  print(all(k))
Output:
- True
  False
  False
  False
  True
Python all() Function Example 2

The below example shows how all() works for dictionaries.
- # Both the keys are true
  dict1 = {1: ‘True’, 2: ‘False’}
  print(all(dict1))
  
  # One of the key is false
  dict2 = {0: ‘True’, 1: ‘True’}
  print(all(dict2))
  
  # Both the keys are false
  dict3 = {0: ‘True’, False: 0}
  print(all(dict3))
  
  # Empty dictionary
  dict4 = {}
  print(all(dict4))
  
  # Here the key is actually true because
  # 0 is non-null string rather than a zero
  dict5 = {‘0’: ‘True’}
  print(all(dict5))
Output:
- True
  False
  False
  True
  True
Python all() Function Example 3

The below example shows how all() works for tuples.
- # all true values
  t1 = (1, 2, 3, 4, 5)
  print(all(t1))
  
  # one false value
  t2 = (0, 1, “Hello”)
  print(all(t2))
  
  # all false values
  t3 = (0, False , 0)
  print(all(t3))
  
  # one true value, all false
  t4 = (True, 0, False)
  print(all(t4))
Output:
- True
  False
  False
  False
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