The python function all(), takes an iterable as parameter and returns True if all elements in the iterative are TRUE or it returns FALSE.
all(iterable) #Where iterable can be a list, string, tuple, dictionary , set etc
The all() takes one and only one mandatory parameter. Any iterable can be passed as a parameter to the all() method.
| Parameter | Description | Required / Optional |
|---|---|---|
|
Iterable |
Any iterable such as list, tuple, string, dictionary etc | Required |
Returns a boolean, either True or False. Returns True only if all the elements in the iterable is True and when the iterable is empty. In all other cases the function returns False.
| Input | Output |
|---|---|
| All values in the iterable True | True |
| All values in the iterable False | False |
| All except one element in the iterable True | False |
| All except one element in the iterable False | False |
| Empty iterable | True |
l = [1, 3, 4, 5]
print(all(l))
# all values false l = [0, False] print(all(l))
t = (1,0,1)
print(all(t)) t= ()
print(all(t))
Output:
True False False True
s = "This is a non empty string" print(all(s))
s = '000'
print(all(s))
s = ''
print(all(s))
While passing a string as a parameter, the most important thing is that '0' is True and 0 is False
Output:
True True True
d = {1: 'False', 2: 'False'} print(all(d))
d = {0: 'True', 2: 'True'} print(all(d))
d = {1: 'True', False: 0} print(all(d))
d = {}
print(all(d))
For dictionaries, the function returns True if all the keys are true, regardless of the values.
Output:
True False False True
