How do I check whether a variable is an integer in Python?

General Discussions
1

How can I check if int python to determine whether a variable is an integer?

How do I check whether a variable is an integer in Python?

2

The most common and Pythonic way to check if a variable is an integer is by using the isinstance() function.

x = 10
if isinstance(x, int):
    print("x is an integer")
else:
    print("x is not an integer")

isinstance(x, int) returns True if x is an instance of int, otherwise False.
3

You can also use the type() function to check the type of a variable.

x = 10
if type(x) == int:
    print("x is an integer")
else:
    print("x is not an integer")

type(x) returns the type of x, and you can compare it directly to int to determine if it’s an integer.

4

If you’re checking whether a string can be converted to an integer, you can use a try-except block.

x = "123"
try:
    int(x)
    print("x can be converted to an integer")
except ValueError:
    print("x cannot be converted to an integer")

This method is useful if the variable is a string that might represent an integer. The ValueError exception is raised if the conversion fails.