Given a string and we have to check whether it contains only digits or not in Python.

給定一個字符串，我們必須檢查它在Python中是否僅包含數字。

To check that a string contains only digits (or a string has a number) – we can use isdigit() function, it returns true, if all characters of the string are digits.

要檢查字符串是否僅包含數字 (或字符串包含數字 )，可以使用isdigit()函數 ，如果字符串的所有字符均為數字，則返回true 。

Syntax:

句法：

string.isdigit()

Example:

例：

Input:str1 = "8789"str2 = "Hello123"str3 = "123Hello"str4 = "123 456" #contains space # function callstr1.isdigit()str2.isdigit()str3.isdigit()str4.isdigit()Output:TrueFalseFalseFalse

Python code to check whether a strings contains a number or not

檢查字符串是否包含數字的Python代碼

# python program to check whether a string # contains only digits or not # variables declaration & initializations str1 = "8789" str2 = "Hello123" str3 = "123Hello" str4 = "123 456" #contains space # checking print("str1.isdigit(): ", str1.isdigit()) print("str2.isdigit(): ", str2.isdigit()) print("str3.isdigit(): ", str3.isdigit()) print("str4.isdigit(): ", str4.isdigit())# checking & printing messages if str1.isdigit():print("str1 contains a number") else:print("str1 does not contain a number")if str2.isdigit():print("str2 contains a number") else:print("str2 does not contain a number")if str3.isdigit():print("str3 contains a number") else:print("str3 does not contain a number")if str4.isdigit():print("str4 contains a number") else:print("str4 does not contain a number")

Output

輸出量

str1.isdigit(): True str2.isdigit(): False str3.isdigit(): False str4.isdigit(): False str1 contains a number str2 does not contain a number str3 does not contain a number str4 does not contain a number

翻譯自: https://www.includehelp.com/python/check-whether-a-string-contains-a-number-or-not.aspx

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