Python String isalnum()方法|极客笔记

Python String isalnum()方法

isalnum() 方法检测字符串是否由字母和数字组成。

Python String isalnum() 语法

isalnum()方法语法：

str.isalnum()

Python String isalnum() 参数

无。

Python String isalnum() 返回值

如果 string 至少有一个字符并且所有字符都是字母或数字则返回 True,否则返回 False

Python String isalnum() 示例1

以下实例展示了isalnum()方法的实例：

string = "apidemos 123"
print(string, "is alphanumeric?", string.isalnum()) # apidemos 123 is alphanumeric? False

string = "apidemos_123"
print(string, "is alphanumeric?", string.isalnum()) # apidemos_123 is alphanumeric? False

string = "000"
print(string, "is alphanumeric?", string.isalnum()) # 000 is alphanumeric? True

string = "bbbb"
print(string, "is alphanumeric?", string.isalnum()) # bbbb is alphanumeric? True

# We can also use Python String isalnum() Method along with if…else statements, to output custom messages
password = "apidemos123456"

if password.isalnum():
 print("Password is alphanumeric.")
else:
 print("Password is not alphanumeric.")

输出:

Python String isalnum()方法