Python all() Function with Examples

Here's a tutorial in which we will discuss about the all() function in python programming language with the help of examples.

Python all() function

The is one of the built-in python functions which uses iterable objects to return the value or . It returns True if all the elements of the specified iterable are true and False if all the elements of the specified iterable are false. The iterable objects can be strings, list, tuple, dictionary, etc.

Syntax of Python all() function:

all(iterable)

Parameter of all() function in python

The python function takes only one argument i.e. iterables.

Iterables - Any type of iterable like tuple, list, dictionary, etc. which includes all the elements.

Return Value of Python all() function

The python function returns the following values;

True - It returns True if all the elements of the specified iterable are true.

False - It returns False if all the elements of the specified iterable are false.

Example 1: How Python all() works for Lists?

# Non-zero values are always considered true by the compiler
li1 = [14, 2, 12, 9]
print(all(li1))
# all values are false
# 0 is considered as false
li2 = [0, False, 0]
print(all(li2))
# one value is false, rest are true
li3 = [14, 0, 47]
print(all(li3))
# one value is true, rest are false
li4 = [True, 0, 0]
print(all(li4))
# empty iterable
li5 = []
print(all(li5))

Output

True
False
False
False
True

Example 2: How Python all() works for Tuples?

# all values are true
tup1 = (14, 92, 2, 10, 7)  
print(all(tup1))
# one value is false rest are true
tup2 = (0, 14, "Answersjet")  
print(all(tup2))
# all values  are false
tup3 = (0, False, 0)  
print(all(tup3))
# one value is true, rest are false  
tup4 = (True, 0, False)
print(all(tup4))  
# empty tuple
tup5 = ()
print(all(tup5))

Output

True
False
False
False
True

Example 3: How Python all() works for Dictionary? 

# both the keys are true
dic1 = {7: 'True', 4: 'False'}
print(all(dic1))
# One of the key is false rest are true
dic2 = {0: 'True', 1: 'True', 6: 'Hello'}
print(all(dic2))
# Both the keys are false
dic3 = {0: 'Answersjet', False: 0}
print(all(dic3))
# Empty dictionary
dic4 = {}
print(all(dic4))
# Above key is true because '0' is a non-null string rather than a zero
dic5 = {'0': 'True'}
print(all(dic5))

Output

True
False
False
True
True

Example 4: How Python all() works for Strings?

# non-null Strings
str = "Answersjet"
print(all(str))
# 0 is False
# '0' is True
str = '000'
print(all(str))
# empty Strings
str = ''
print(all(str))

Output

True
True
True