Python String isdigit() Method

Python String isdigit() Method

Last Updated : 01 May, 2025

The isdigit() method is a built-in Python function that checks if all characters in a string are digits. This method returns True if each character in the string is a numeric digit (0-9) and False otherwise. Example:

Python

a = "12345"
print(a.isdigit())  

b = "1234a5"
print(b.isdigit())

Output

True
False

Explanation: In this example, a.isdigit() returns True because "12345" consists entirely of numeric characters, while b.isdigit() returns False due to the non-numeric character "a" in the string.

Syntax of isdigit()

s.isdigit()

Parameters: This method does not take any parameters

Returns:

It returns True if every character in the string is a numeric digit (0-9).
It returns False if there is any non-numeric character in the string.

Examples of isdigit()

Let's explore some examples of isdigit() method for better understanding.

Example 1: Here are example with a string containing only digits, a mixed-character string and an empty string.

Python

# Only digits
print("987654".isdigit()) 

# Digits and alphabet
print("987b54".isdigit()) 

# Empty string
print("".isdigit())

Output

True
False
False

Explanation:

"987654".isdigit() returns True as it contains only numeric digits.
"987b54".isdigit() returns False due to the non-digit character 'b'.
"".isdigit() returns False because the string is empty.

Example 2: The isdigit() method can also be used to check numeric characters encoded in Unicode, such as the standard digit '1' and other Unicode representations of numbers.

Python

# Unicode for '1'
a = "\u0031"  
print(a.isdigit()) 

# Devanagari digit for '1'
b = "\u0967"  
print(b.isdigit())

Output

True
True

Explanation:

"\u0031".isdigit() returns True as it represents the standard digit '1'.
"\u0967".isdigit() returns True as it represents the Devanagari digit '1'.

Example 3: Here are example with Roman numerals, which are not recognized as digits.

Python

print("I".isdigit())  
print("X".isdigit())  
print("VII".isdigit())

Output

False
False
False

Explanation: "I".isdigit(), "X".isdigit() and "VII".isdigit() all return False as Roman numerals are not recognized as digits by isdigit().

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