elp on class str in module __builtin__:

关于__builtin__模块中str类的帮助信息：

class str(basestring)
 |  str(object) -> string
 |  
 |  Return a nice string representation of the object.
 |  If the argument is a string, the return value is the same object.

【返回一个对象的string格式】
 |  
 |  Method resolution order:
 |      str
 |      basestring
 |      object
 |  
 |  Methods defined here:
 |  
 |  __add__(...)【加法】
 |      x.__add__(y) <==> x+y
 |  
 |  __contains__(...)【蕴含】
 |      x.__contains__(y) <==> y in x
 |  
 |  __eq__(...)【相等】
 |      x.__eq__(y) <==> x==y
 |  
 |  __format__(...)【格式转换】
 |      S.__format__(format_spec) -> unicode
 |  
 |  __ge__(...)【大于等于】
 |      x.__ge__(y) <==> x>=y
 |  
 |  __getattribute__(...)【获取属性】
 |      x.__getattribute__(‘name‘) <==> x.name
 |  
 |  __getitem__(...)【获取条目】
 |      x.__getitem__(y) <==> x[y]
 |  
 |  __getnewargs__(...)【？？？？】
 |  
 |  __getslice__(...)【获取切片】
 |      x.__getslice__(i, j) <==> x[i:j]
 |      
 |      Use of negative indices is not supported.
 |  
 |  __gt__(...)【大于】
 |      x.__gt__(y) <==> x>y
 |  
 |  __hash__(...)【？？？？】
 |      x.__hash__() <==> hash(x)
 |  
 |  __le__(...)【小于等于】
 |      x.__le__(y) <==> x<=y
 |  
 |  __len__(...)【字符串长度】
 |      x.__len__() <==> len(x)
 |  
 |  __lt__(...)【小于】
 |      x.__lt__(y) <==> x<y
 |  
 |  __mod__(...)【模】
 |      x.__mod__(y) <==> x%y
 |  
 |  __mul__(...)【乘】
 |      x.__mul__(n) <==> x*n
 |  
 |  __ne__(...)【不等于】
 |      x.__ne__(y) <==> x!=y
 |  
 |  __repr__(...)【？？？？】
 |      x.__repr__() <==> repr(x)
 |  
 |  __rmod__(...)【被模】
 |      x.__rmod__(y) <==> y%x
 |  
 |  __rmul__(...)【被乘】
 |      x.__rmul__(n) <==> n*x
 |  
 |  __sizeof__(...)【字节数】
 |      S.__sizeof__() -> size of S in memory, in bytes
 |  
 |  __str__(...)【返回x的str形式】
 |      x.__str__() <==> str(x)
 |  
 |  capitalize(...)【返回字符串S的副本，首字母大写】
 |      S.capitalize() -> string
 |      
 |      Return a copy of the string S with only its first character
 |      capitalized.
 |  
 |  center(...)【返回一个以S为中心的字符串，其余字符用fillchar填充】
 |      S.center(width[, fillchar]) -> string
 |      
 |      Return S centered in a string of length width. Padding is
 |      done using the specified fill character (default is a space)
 |  
 |  count(...)【返回以start开始，以end结尾的切片子串包含的字符数】
 |      S.count(sub[, start[, end]]) -> int
 |      
 |      Return the number of non-overlapping occurrences of substring sub in
 |      string S[start:end].  Optional arguments start and end are interpreted
 |      as in slice notation.
 |  
 |  decode(...)【译码】
 |      S.decode([encoding[,errors]]) -> object
 |      
 |      Decodes S using the codec registered for encoding. encoding defaults
 |      to the default encoding. errors may be given to set a different error
 |      handling scheme. Default is ‘strict‘ meaning that encoding errors raise
 |      a UnicodeDecodeError. Other possible values are ‘ignore‘ and ‘replace‘
 |      as well as any other name registered with codecs.register_error that is
 |      able to handle UnicodeDecodeErrors.
 |  
 |  encode(...)【编码】
 |      S.encode([encoding[,errors]]) -> object
 |      
 |      Encodes S using the codec registered for encoding. encoding defaults
 |      to the default encoding. errors may be given to set a different error
 |      handling scheme. Default is ‘strict‘ meaning that encoding errors raise
 |      a UnicodeEncodeError. Other possible values are ‘ignore‘, ‘replace‘ and
 |      ‘xmlcharrefreplace‘ as well as any other name registered with
 |      codecs.register_error that is able to handle UnicodeEncodeErrors.
 |  
 |  endswith(...)【字符串S是否以指定的suffix结尾】
 |      S.endswith(suffix[, start[, end]]) -> bool
 |      
 |      Return True if S ends with the specified suffix, False otherwise.
 |      With optional start, test S beginning at that position.
 |      With optional end, stop comparing S at that position.
 |      suffix can also be a tuple of strings to try.
 |  
 |  expandtabs(...)【替换制表符，参数是制表符包含空格数，默认8字符】
 |      S.expandtabs([tabsize]) -> string
 |      
 |      Return a copy of S where all tab characters are expanded using spaces.
 |      If tabsize is not given, a tab size of 8 characters is assumed.
 |  
 |  find(...)【寻找子串，返回索引最小的位置。没找到则返回-1】
 |      S.find(sub [,start [,end]]) -> int
 |      
 |      Return the lowest index in S where substring sub is found,
 |      such that sub is contained within s[start:end].  Optional
 |      arguments start and end are interpreted as in slice notation.
 |      
 |      Return -1 on failure.
 |  
 |  format(...)【？？？？】
 |      S.format(*args, **kwargs) -> unicode
 |  
 |  index(...)【与S.find类似，但是如果没有找到则引发ValueError】
 |      S.index(sub [,start [,end]]) -> int
 |      
 |      Like S.find() but raise ValueError when the substring is not found.
 |  
 |  isalnum(...)【如果S非空且全部字符都是字母或数字，则返回True】
 |      S.isalnum() -> bool
 |      
 |      Return True if all characters in S are alphanumeric
 |      and there is at least one character in S, False otherwise.
 |  
 |  isalpha(...)【如果S非空且全部字符都是字母，则返回True】
 |      S.isalpha() -> bool
 |      
 |      Return True if all characters in S are alphabetic
 |      and there is at least one character in S, False otherwise.
 |  
 |  isdigit(...)【如果S非空且全部字符都是数字，则返回True】
 |      S.isdigit() -> bool
 |      
 |      Return True if all characters in S are digits
 |      and there is at least one character in S, False otherwise.
 |  
 |  islower(...)【S为非空且全部字符均为小写字母，则返回真】
 |      S.islower() -> bool
 |      
 |      Return True if all cased characters in S are lowercase and there is
 |      at least one cased character in S, False otherwise.
 |  
 |  isspace(...)【S为非空且全部字符均为空格，则返回真】
 |      S.isspace() -> bool
 |      
 |      Return True if all characters in S are whitespace
 |      and there is at least one character in S, False otherwise.
 |  
 |  istitle(...)【判断S是否是title，title就是字符串中所有单词首字母大写，其余小写】
 |      S.istitle() -> bool
 |      
 |      Return True if S is a titlecased string and there is at least one
 |      character in S, i.e. uppercase characters may only follow uncased
 |      characters and lowercase characters only cased ones. Return False
 |      otherwise.
 |  
 |  isupper(...)【S为非空且全部字符均为大写字母，则返回真】
 |      S.isupper() -> bool
 |      
 |      Return True if all cased characters in S are uppercase and there is
 |      at least one cased character in S, False otherwise.
 |  
 |  join(...)【在iterable中的每两个元素之间放一个S】
 |      S.join(iterable) -> string
 |      
 |      Return a string which is the concatenation of the strings in the
 |      iterable.  The separator between elements is S.
 |  
 |  ljust(...)【左对齐，默认空格补齐】
 |      S.ljust(width[, fillchar]) -> string
 |      
 |      Return S left-justified in a string of length width. Padding is
 |      done using the specified fill character (default is a space).
 |  
 |  lower(...)【返回S的小写副本】
 |      S.lower() -> string
 |      
 |      Return a copy of the string S converted to lowercase.
 |  
 |  lstrip(...)【去掉左边的空白字符（回车、空格、tab之类）】
 |      S.lstrip([chars]) -> string or unicode
 |      
 |      Return a copy of the string S with leading whitespace removed.
 |      If chars is given and not None, remove characters in chars instead.
 |      If chars is unicode, S will be converted to unicode before stripping
 |  
 |  partition(...)
 |      S.partition(sep) -> (head, sep, tail)     

>>> print s
zhangheABC
>>> print s.partition(‘gh‘)
(‘zhan‘, ‘gh‘, ‘eABC‘)
 |      Search for the separator sep in S, and return the part before it,
 |      the separator itself, and the part after it.  If the separator is not
 |      found, return S and two empty strings.
 |  
 |  replace(...)【用new替换S中的old，cnt表示替换几个】
 |      S.replace(old, new[, count]) -> string
 |      
 |      Return a copy of string S with all occurrences of substring
 |      old replaced by new.  If the optional argument count is
 |      given, only the first count occurrences are replaced.
 |  
 |  rfind(...)【在S中找sub子串，返回索引最大的那个，失败就返回-1】
 |      S.rfind(sub [,start [,end]]) -> int
 |      
 |      Return the highest index in S where substring sub is found,
 |      such that sub is contained within s[start:end].  Optional
 |      arguments start and end are interpreted as in slice notation.
 |      
 |      Return -1 on failure.
 |  
 |  rindex(...)【和s.rfind类似，但是如果找不到就返回valueerror】
 |      S.rindex(sub [,start [,end]]) -> int
 |      
 |      Like S.rfind() but raise ValueError when the substring is not found.
 |  
 |  rjust(...)【右对齐，默认用空格补齐】
 |      S.rjust(width[, fillchar]) -> string
 |      
 |      Return S right-justified in a string of length width. Padding is
 |      done using the specified fill character (default is a space)
 |  
 |  rpartition(...)
 |      S.rpartition(sep) -> (head, sep, tail)
 |      
 |      Search for the separator sep in S, starting at the end of S, and return
 |      the part before it, the separator itself, and the part after it.  If the
 |      separator is not found, return two empty strings and S.
 |  
 |  rsplit(...)【把S根据sep分割成一个list】
 |      S.rsplit([sep [,maxsplit]]) -> list of strings
 |      
 |      Return a list of the words in the string S, using sep as the
 |      delimiter string, starting at the end of the string and working
 |      to the front.  If maxsplit is given, at most maxsplit splits are
 |      done. If sep is not specified or is None, any whitespace string
 |      is a separator.
 |  
 |  rstrip(...)【去除右边的字串】
 |      S.rstrip([chars]) -> string or unicode
 |      
 |      Return a copy of the string S with trailing whitespace removed.
 |      If chars is given and not None, remove characters in chars instead.
 |      If chars is unicode, S will be converted to unicode before stripping
 |  
 |  split(...)【分割】
 |      S.split([sep [,maxsplit]]) -> list of strings
 |      
 |      Return a list of the words in the string S, using sep as the
 |      delimiter string.  If maxsplit is given, at most maxsplit
 |      splits are done. If sep is not specified or is None, any
 |      whitespace string is a separator and empty strings are removed
 |      from the result.
 |  
 |  splitlines(...)
 |      S.splitlines([keepends]) -> list of strings
 |      
 |      Return a list of the lines in S, breaking at line boundaries.
 |      Line breaks are not included in the resulting list unless keepends
 |      is given and true.
 |  
 |  startswith(...)【是否以prefix开头】
 |      S.startswith(prefix[, start[, end]]) -> bool
 |      
 |      Return True if S starts with the specified prefix, False otherwise.
 |      With optional start, test S beginning at that position.
 |      With optional end, stop comparing S at that position.
 |      prefix can also be a tuple of strings to try.
 |  
 |  strip(...)【去除两边的空格】
 |      S.strip([chars]) -> string or unicode
 |      
 |      Return a copy of the string S with leading and trailing
 |      whitespace removed.
 |      If chars is given and not None, remove characters in chars instead.
 |      If chars is unicode, S will be converted to unicode before stripping
 |  
 |  swapcase(...)【大写变小写，小写变大写】
 |      S.swapcase() -> string
 |      
 |      Return a copy of the string S with uppercase characters
 |      converted to lowercase and vice versa.
 |  
 |  title(...)【变成title】
 |      S.title() -> string
 |      
 |      Return a titlecased version of S, i.e. words start with uppercase
 |      characters, all remaining cased characters have lowercase.
 |  
 |  translate(...)
 |      S.translate(table [,deletechars]) -> string
 |      
 |      Return a copy of the string S, where all characters occurring
 |      in the optional argument delete chars are removed, and the
 |      remaining characters have been mapped through the given
 |      translation table, which must be a string of length 256.
 |  
 |  upper(...)【返回一个S的大写副本】
 |      S.upper() -> string
 |      
 |      Return a copy of the string S converted to uppercase.
 |  
 |  zfill(...)【0左填充】
 |      S.zfill(width) -> string
 |      
 |      Pad a numeric string S with zeros on the left, to fill a field
 |      of the specified width.  The string S is never truncated.
 |  
 |  ----------------------------------------------------------------------
 |  Data and other attributes defined here:
 |  
 |  __new__ = <built-in method __new__ of type object>
 |      T.__new__(S, ...) -> a new object with type S, a subtype of 

Python-str函数