• Python Str内部功能-个人课堂笔记,课后总结


    查看str内部功能,可通过和int一样的方法,或者使用help(str)、dir(str)来查看。

    1、capitalize:首字母大写

      S.capitalize() -> string

    str1 = "parr"
    result = str1.capitalize()
    print(result)
    
    #返回Parr
    View Code

    2、center(self, width, fillchar=None):内容居中,width:总长度;fillchar:空白处填充内容(默认无)

      S.center(width[, fillchar]) -> string

    str1 = "parr"
    result = str1.center(10,"*")
    print(result)
    
    #返回***parr***
    View Code

    3、count(self, sub, start=None, end=None):str的子序列个数,区分大小写

      S.count(sub[, start[, end]]) -> int

    str1 = "parrAbcadb"
    result = str1.count("a")
    print(result)
    
    #返回2,表示找到两个a
    View Code

    4、decode(self, encoding=None, errors=None):解码

      S.decode([encoding[,errors]]) -> object

    str1 = "哈哈"
    result = str1.encode()
    str2 = result.decode()
    print(str2)
    
    屏幕打印:哈哈
    View Code

    5、encode(self, encoding=None, errors=None):编码

      S.encode([encoding[,errors]]) -> object

    str1 = "哈哈"
    result = str1.encode()
    print(result)
    
    #返回b'xe5x93x88xe5x93x88'
    View Code

    6、endswith(self, suffix, start=None, end=None):受否以XX结束,返回bool型的值

      S.endswith(suffix[, start[, end]]) -> bool

    str1 = "parr Luck 2017"
    result = str1.endswith("2017")
    print(result)
    
    #屏幕打印Ture
    View Code

    7、expandtabs(self, tabsize=None):将Tab转换为空格,默认一个Tab八个空格

      S.expandtabs([tabsize]) -> string

    str1 = "parr	hello"
    result = str1.expandtabs()
    print(result)
    
    屏幕打印:parr    hello
    View Code

    8、find(self, sub, start=None, end=None):寻找子序列位置,如没找到返回-1

      S.find(sub [,start [,end]]) -> int

    str1 = "parr"
    result = str1.find('a')
    print(result)
    
    #屏幕打印1,表示a在1位置
    View Code

    9、isalnum(self):是否是字母或数字,返回bool型的值

      S.isalnum() -> bool

    str1 = "parr2017"
    result = str1.isalnum()
    print(result)
    
    #屏幕打印:Ture
    View Code

    10、isalpha(self): :是否是字母

      S.isalpha() -> bool

    str1 = "parr"
    result = str1.isalpha()
    print(result)
    
    #屏幕打印:Ture
    View Code

    11、isnumeric(self):是否是数字

      S.isnumeric() -> bool

    str1 = "2017"
    result = str1.isnumeric()
    print(result)
    
    #屏幕打印Ture
    View Code

    12、islower(self):是否是小写

      isupper(self)::是否是大写

      S.islower() -> bool

    str1 = "parr"
    result = str1.islower()
    print(result)
    
    #返回Ture
    
    str1 = "parr"
    result = str1.isupper()
    print(result)
    
    #返回False
    View Code

    13、replace(self, old, new, count=None):替换内容

      S.replace(old, new[, count]) -> string

    str1 = "parr"
    result = str1.replace('a','hello')
    print(result)
    
    #屏幕打印:phellorr
    View Code

    14、split(self, sep=None, maxsplit=None):分割内容,maxsplit最多分割几次,返回一个列表

      S.split([sep [,maxsplit]]) -> list of strings

    str1 = "parr"
    result = str1.split('a')
    print(result)
    
    #返回['p', 'rr']
    View Code

    15、splitlines(self, keepends=False)::根据换行分割,返回一个列表

      S.splitlines(keepends=False) -> list of strings

    str1 = """parr
            hello
            everyone
    """
    result = str1.splitlines()
    print(result)
    
    #返回['parr', '        hello', '        everyone']
    View Code

    16、startswith(self, prefix, start=None, end=None):是否起始为prefix中的内容

      S.startswith(prefix[, start[, end]]) -> bool

    str1 = """parr
            hello
            everyone
    """
    result = str1.startswith('parr')
    print(result)
    
    #返回Ture
    View Code

    17、strip(self, chars=None):移除两端空白

      S.strip([chars]) -> string or unicode

    str1 = "            parr2017              "
    result = str1.strip()
    print(result)
    
    #返回parr2017
    View Code

    18、__contains__(self, y):检查y是否包含于x中

      x.__contains__(y) <==> y in x

    View Code
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  • 原文地址:https://www.cnblogs.com/parr2017/p/7777943.html
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