python内置函数：isalnum()， isalpha()， isdigit()， islower()， isspace()， istitle() ，isupper()

Bertha 。 2021-11-26 08:36 165阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70]  
源码参考：

def isalnum(self): # real signature unknown; restored from __doc__
            """ B.isalnum() -> bool Return True if all characters in B are alphanumeric and there is at least one character in B, False otherwise. """
            return False

def isalpha(self): # real signature unknown; restored from __doc__
            """ B.isalpha() -> bool Return True if all characters in B are alphabetic and there is at least one character in B, False otherwise. """
            return False

def isdigit(self): # real signature unknown; restored from __doc__
            """ B.isdigit() -> bool Return True if all characters in B are digits and there is at least one character in B, False otherwise. """
            return False

def islower(self): # real signature unknown; restored from __doc__
            """ B.islower() -> bool Return True if all cased characters in B are lowercase and there is at least one cased character in B, False otherwise. """
            return False

def isspace(self): # real signature unknown; restored from __doc__
            """ B.isspace() -> bool Return True if all characters in B are whitespace and there is at least one character in B, False otherwise. """
            return False

def istitle(self): # real signature unknown; restored from __doc__
            """ B.istitle() -> bool Return True if B is a titlecased string and there is at least one character in B, i.e. uppercase characters may only follow uncased characters and lowercase characters only cased ones. Return False otherwise. """
            return False

def isupper(self): # real signature unknown; restored from __doc__
            """ B.isupper() -> bool Return True if all cased characters in B are uppercase and there is at least one cased character in B, False otherwise. """
            return False

python内置函数—hex（）,oct（）,chr（）,ord（）链接：[https://blog.csdn.net/gymaisyl/article/details/96974919][https_blog.csdn.net_gymaisyl_article_details_96974919]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70]: /images/20211126/15bba2f2309b4ad190a49becaf2063e9.png
[https_blog.csdn.net_gymaisyl_article_details_96974919]: https://blog.csdn.net/gymaisyl/article/details/96974919