函数解析——python学习第三次总结

.str字符串类型（二）

1.　　isalpha　　判断目标字符串中是否只含字母

　　表达式　　str.isalpha()　　==>　　bool

　　示例：

1 a = 'alex'
2 v = a.isalpha()
3 print(v)# 输出# True

　　源码：

1     def isalpha(self, *args, **kwargs): # real signature unknown
2         """
3         Return True if the string is an alphabetic string, False otherwise.
4         
5         A string is alphabetic if all characters in the string are alphabetic and there
6         is at least one character in the string.
7         """

 

2.　　isdecimal

  　　 isdigit　　都是用来判断目标字符串是否是数字，下面这个不光能判断纯文本，还能判断复杂符号。

　　表达式　　str.isdecimal()　　==>　　bool

　　          　　 str.isdigit()　　==>　　bool

　　示例：

1 a = '②'
2 b = a.isdecimal()
3 c = a.isdigit()
4 print(b,c)# 输出# false true

　　源码：

1     def isdecimal(self, *args, **kwargs): # real signature unknown
2         """
3         Return True if the string is a decimal string, False otherwise.
4         
5         A string is a decimal string if all characters in the string are decimal and
6         there is at least one character in the string.
7         """

1     def isdigit(self, *args, **kwargs): # real signature unknown
2         """
3         Return True if the string is a digit string, False otherwise.
4         
5         A string is a digit string if all characters in the string are digits and there
6         is at least one character in the string.
7         """

 

3.　　

 

来源：https://www.cnblogs.com/zhuqt-2008/p/11511912.html