How To Use Python String IsDigit() Method – Easy Python Code Guide

In this tutorial, we’ll learn what Python string isdigit() method is and how to properly use it. We’ll go through multiple Python code examples to understand how isdigit() method works.

Introduction: Python String isdigit() Method

This method will return True if a string consists of only digit characters, or else it will return False.

Syntax of isdigit() Method

string.isdigit()

• Python string isdigit method does not take any arguments.
• This method returns True if the string has only digit characters and will return False if atleast one character is non-digit.

Example 1: Applying isdigit() Method on a Python String

stringVal='234906'
print( stringVal.isdigit() )

Output

True

The string has only digit characters present in it so Python string isdigit method return True.

Let’s pass some non-digit characters to string and see what this method will return. See below examples:

print('234 45'.isdigit())
print('234_45'.isdigit())
print('234-45'.isdigit())
print('234,45'.isdigit())
print('234.45'.isdigit())
print('23445st'.isdigit())
print('23445&'.isdigit())
print('@*223445'.isdigit())

Output

False 
False 
False 
False 
False 
False 
False 
False

A digit is a character having property value:

1. Numeric_Type=Digit
2. Numeric_Type=Decimal

In Python, superscript and subscripts (usually written using unicode) are also considered digit characters. Hence, if the string contains these characters along with decimal characters, then Python string isdigit() method returns True.

The roman numerals, currency numerators and fractions (usually written using unicode) are considered numeric characters but not digits. Python string isdigit method returns False if the string contains these characters.

Example 2: String Having Numeric and Digit Characters

print('2374'.isdigit())
print('\u00B23455'.isdigit())  // superscript is a digit
print('\u00BD'.isdigit())      // fraction is not a digit

Output

True 
True 
False

strVal='345432'
returnedValue=strVal.isdigit()
print(returnedValue)

Output

True

Python string isdigit method returns True as the string has only digit characters.

Conclusion

To conclude this tutorial, hope you now have an in-depth practical knowledge of how to properly use Python string isdigit method. I’ll be looking forward to receive your valuable feedback on this post. Thank you for reading it.