Python String isalnum()方法

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: