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The Python all() function is used to return true when boolean value of all elements of an iterable are true, else returns false. An iterable object can be any data structure like list, tuple, set, string, dictionary and range() function etc. and boolean value of an element of iterable is always true unless:

  • The element is False
  • The element is 0
  • The element is None

Syntax

all(iterable)

Parameters

iterable Required. iterable object like list, tuple, set, string , dictionary and range() etc.

Example:

In the below example, all() function is used to return true when boolean value of all elements of a list are true.

MyString = "Hello"
print(all(MyString))

MyList = []
print(all(MyList))

MyTuple = (None, 0, 1)
print(all(MyTuple))

The output of the above code will be:

True
True
False

Please note that, for empty iterable, all() function returns True value.

❮ Python Built-in Functions