The syntax of all()
method is:
all(iterable)
all() Parameters
all()
method takes a single parameter:
- iterable - any iterable (list, tuple, dictionary, etc.) which contains the elements
Return Value from all()
all()
method returns:
- True - If all elements in an iterable are true
- False - If any element in an iterable is false
When | Return Value |
---|---|
All values are true | True |
All values are false | False |
One value is true (others are false) | False |
One value is false (others are true) | False |
Empty Iterable | True |
Example 1: How all() works for lists?
# all values true
l = [1, 3, 4, 5]
print(all(l))
# all values false
l = [0, False]
print(all(l))
# one false value
l = [1, 3, 4, 0]
print(all(l))
# one true value
l = [0, False, 5]
print(all(l))
# empty iterable
l = []
print(all(l))
Output
True False False False True
any()
method works in a similar way for tuples and sets like lists.
Example 2: How all() works for strings?
s = "This is good"
print(all(s))
# 0 is False
# '0' is True
s = '000'
print(all(s))
s = ''
print(all(s))
Output
True True True
Example 3: How all() works with Python dictionaries?
In case of dictionaries, if all keys (not values) are true or the dictionary is empty, all() returns True. Else, it returns false for all other cases..
s = {0: 'False', 1: 'False'}
print(all(s))
s = {1: 'True', 2: 'True'}
print(all(s))
s = {1: 'True', False: 0}
print(all(s))
s = {}
print(all(s))
# 0 is False
# '0' is True
s = {'0': 'True'}
print(all(s))
Output
False True False True True