Check if a set is empty in Python

Current Location：Home > Learning > PROGRAM > Python >

Python PHP Java Go TypeScript C++ Vba Node.js C语言 MATLAB

Check if a set is empty in Python

Author：JIYIK Last Updated：2025/05/06 Views：

This tutorial will discuss various ways to check if a set is empty in Python. We will define a method empty_set()which will return if the set is empty Trueand return otherwise False. This method is useful when we want to perform an operation on non-empty sets and skip the empty sets.

`len()`Check if a set is empty using the function in Python

len()The function takes an object as input and returns its length. To check if a collection is empty, we can check if its length is zero.

Sample code:

def is_empty(a):
    return len(a) == 0


a = set("a")
b = set()
print(is_empty(a))
print(is_empty(b))

Output:

False
True

`bool()`Check if a set is empty using the function in Python

The method in Python bool()returns if the input is not empty Trueand returns if the input is empty False. The following sample code demonstrates how to use bool()the function to check whether a collection is empty.

def is_empty(a):
    return not bool(a)


a = set("a")
b = set()
print(is_empty(a))
print(is_empty(b))

Output:

False
True

`set()`Check if a set is empty using the

set()Method initializes an empty set. Hence, if the given set is equal to set(), it means it is empty.

Sample code:

def is_empty(a):
    return a == set()


a = set("a")
b = set()
print(is_empty(a))
print(is_empty(b))

Output:

False
True

`not`Check if a set is empty using the operator in Python

notThe operator reverses its operand and returns Truethe operand recognized as such False, just like the empty set, and returns Falsethe operand not being empty.

def is_empty(a):
    return not a


a = set("a")
b = set()
print(is_empty(a))
print(is_empty(b))

Output:

False
True

Previous：If not statement in Python

Next：Printing objects of a class in Python

For reprinting, please send an email to 1244347461@qq.com for approval. After obtaining the author's consent, kindly include the source as a link.

Article URL：

JIYIK CN >