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def capitalize(self):    """首字母变大写"""def center(self,width,fillchar=None):    """内容居中，width:总长度;fillchar:空白处填充内容,默认无"""def count(self,sub,start=None,end=None):    """s.count(sub[,start[,end]])->int"""def decode(self,encoding=None,errors=None):    """解码"""def encode(self,encoding=None,errors=None):    """编码"""def endswith(self,suffix,start=None,end=None):    """是否以XXX结束"""def expandtabs(self.tabsize=None):    """将tab转换为空格，默认一个tab转换为八个空格"""def find(self,sub,start=None,end=None):    """寻找子序列位置，如果没有找到，返回-1"""def format(*args,**kwargs):    """字符串格式化，动态参数，函数式编程"""def index(self,sub,start=None,end=None):    """子序列位置，如果没有找到，报错"""def isalnum(self):    """是否是字母和数字"""def isalpha(self):    """是否是字母"""def isdigit(self):    """是否是数字"""def islower(self):    """是否小写"""def isspace(self):    """是否全部是空格"""def istitle(self):    """每个分割字符都是首字母大写"""def isupper(self):    """判断每个字母都是大写"""def join(self,iterable):    """用指定的字符串连接列表元素"""def ljust(self,width,fillchar=None):    """内容左对齐，右侧填充"""def lower(self):    """变小写"""def lstrip(self,chars=None):    """移除左侧空白"""def partition(self,sep):    """分割前中后三部分"""def replace(self,old,new,count=None):    """替换"""def rfind(self,sub,start=None,end=None):    """从右往左找"""def rindex(self,sub,start=None,end=None):    """从右往左寻找子字符串"""def rjust(self,width,fillchar=None):    """从右往左填充"""def rpartition(self,sep):    """从右往左分割"""def rsplit(self,sep=None,maxsplit=None):    """从右往左分割"""def rstrip(self,chars=None):    """从右往左脱去空格"""def split(self,sep=None,maxsplit=None):    """分割,maxsplit最多分割几次"""def splitlines(self,keepends=False):    """根据换行分割"""def startswith(self,prefix,start=None,end=None):    """是否起始"""def strip(self,chars=None):    """移除两段空白"""def swapcase(self):    """大写变小写,小写变大写"""def translate(self,table,deletechars=None):    """转换，需要先做一个对应表，最后一个表示删除字符集合"""def upper(self):    """大写"""def zfill(self,width):    """方法返回指定长度的字符串，原字符串右对齐，前面填充0"""