How to determine whether python is a numeric string

How to determine whether a string is a numeric string in python: 1. Determine whether a string is a number by creating a custom function [is_number()] method; 2. You can use an inline if statement to achieve this.

The operating environment of this tutorial: Windows 7 system, python version 3.9, DELL G3 computer.

Python method to determine whether it is a numeric string:

1. By creating a custom function is_number() Method to determine whether a string is a number:

Example

# -*- coding: UTF-8 -*-
 
# Filename : test.py
# author by : www.runoob.com
 
def is_number(s):
    try:
        float(s)
        return True
    except ValueError:
        pass
 
    try:
        import unicodedata
        unicodedata.numeric(s)
        return True
    except (TypeError, ValueError):
        pass
 
    return False
 
# 测试字符串和数字
print(is_number('foo'))   # False
print(is_number('1'))     # True
print(is_number('1.3'))   # True
print(is_number('-1.37')) # True
print(is_number('1e3'))   # True
 
# 测试 Unicode
# 阿拉伯语 5
print(is_number('٥'))  # True
# 泰语 2
print(is_number('๒'))  # True
# 中文数字
print(is_number('四')) # True
# 版权号
print(is_number('©'))  # False

2. We can also use inline if statements to achieve this:

The output result of executing the above code is:

False
True
True
True
True
True
True
True
False

3. More methods

Python isdigit() method detects whether the string consists only of digits composition.

Python isnumeric() method detects whether a string consists only of numbers. This method is only for unicode objects.

Related free learning recommendations: python video tutorial

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