Python String isnumeric()

Summary: in this tutorial, you’ll learn how to use the Python string isnumeric() method to check if all characters in a string are numeric characters.

Introduction to the Python string isnumeric() method

The string isnumeric() method returns True if:

All characters in a string are numeric
and the string contains at least one character.

The following shows the syntax of the isnumeric() method:

str.isnumeric()Code language: CSS (css)

Like isdigit() method, the isnumeric() method returns True if all characters in the string are numeric characters 0-9.

In addition, it also returns True if the string contains characters used in place of digits in other languages

For example, in Chinese, the number 1,2,3 is counted as 一，二，三. The isnumeric() returns True for these numeric characters:

result = '一二三'.isnumeric()
print(result)Code language: PHP (php)

Output:

TrueCode language: PHP (php)

However, the isdigit() method returns False in this case:

result = '一二三'.isdigit()
print(result)Code language: PHP (php)

Output:

FalseCode language: PHP (php)

This is the main difference between the isnumeric() and isdigit() methods.

Python string isnumeric() method example

The following example uses the isnumeric() method to determine if all characters are numeric characters:

amount = '123'
result = amount.isnumeric()

print(result)Code language: PHP (php)

Output:

TrueCode language: PHP (php)

All the characters in the strings '99.99' and '-10' are not numeric, therefore, the isnumeric() method returns False:

price = '99.99'
print(price.isnumeric())

discount = '-10'
print(discount.isnumeric())Code language: PHP (php)

Output:

False
FalseCode language: PHP (php)

Summary

Use the Python string isnumeric() to determine if all characters in a string are numeric characters.

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