all(iterable)

Checks if all specified elements are truthy.

Parameters¶

all() takes one parameter:

• iterable - an iterable object (list, tuple, dictionary, etc.) containing elements

Return Value¶

all() returns:

• True — if all elements in the iterable are truthy
• False — if any element in the iterable is false

Examples¶

How does all() work with lists?

# All values are truthy
list_ = [1, 3, 4, 5]
print(all(list_))

# All values are false
list_ = [0, False]
print(all(list_))

# One value is false
list_ = [1, 3, 4, 0]
print(all(list_))

# One value is truthy
list_ = [0, False, 5]
print(all(list_))

# Empty iterable
list_ = []
print(all(list_))

# Result: 
# True
# False
# False
# False
# True

all() works similarly for tuples and sets, just like lists.

How does all() work with strings?

s = "Great!"
print(all(s))

# '0' is True
s = '000'
print(all(s))

s = ''
print(all(s))

# Result: 
# True
# True
# True

How does all() work with Python dictionaries?

For dictionaries, if all keys (not values) are truthy or the dictionary is empty, all() returns True. Otherwise, it returns False.

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 True
s = {'0': True}
print(all(s))

# Result: 
# False
# True
# False
# True
# True