Python开发（基础）：字符串

字符串常用方法说明
#!/usr/bin/env python
# -*- coding:utf-8 -*-

# 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.
#     """
#
#     def capitalize(self):  # real signature unknown; restored from __doc__
#         """
#          首字母大写
#         S.capitalize() -> string
#
#         Return a copy of the string S with only its first character
#         capitalized.
#         """
#         return ""
#
str_capitalize = 'welcome'
print str_capitalize.capitalize()
#输出：Welcome

#     def center(self, width, fillchar=None):  # real signature unknown; restored from __doc__
#         """
#         原字符串居中显示，两边可选择填充字符
#         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)
#         """
#         return ""
str_center = 'hello'
print str_center.center(20,'*')
#输出：*******hello********
#     def count(self, sub, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         字符串中某个子字符串出现的次数
#         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.
#         """
#         return 0
#
str_count = 'helikdk;a'
print str_count.count('k')
#输出：2
#     def decode(self, encoding=None, errors=None):  # real signature unknown; restored from __doc__
#         """
#         字符串解码
#         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.
#         """
#         return object()
#
#     def encode(self, encoding=None, errors=None):  # real signature unknown; restored from __doc__
#         """
#         字符串编码
#         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.
#         """
#         return object()
#
#     def endswith(self, suffix, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         判断字符串是否以什么结尾
#         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.
#         """
#         return False
#
#     def expandtabs(self, tabsize=None):  # real signature unknown; restored from __doc__
#         """
#         将字符串中的tab键替换成空格（默认是8个空格），也可自己指定
#         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.
#         """
#         return ""
#
str_expandtabs = 'hello\talex'
print str_expandtabs
print str_expandtabs.expandtabs(20)
#输出：hello  alex
#      hello               alex
#     def find(self, sub, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         查找字符串中子字符串第一次出现的位置（下标从0开始），也可指定从某个位置开始查找，或结束查找,
#         如果找不到就返回-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.
#         """
#         return 0
#
str_find = 'kdlafjdklkdla'
print str_find.find('la',4)
#输出：11
#     def format(self, *args, **kwargs):  # known special case of str.format
#         """
#         通过通配符来格式化字符串
#         S.format(*args, **kwargs) -> string
#
#         Return a formatted version of S, using substitutions from args and kwargs.
#         The substitutions are identified by braces ('{' and '}').
#         """
#         pass
#
str_format = 'hell {0},age {1}'
print str_format.format('alex',19)
#输出：hell alex,age 19
#     def index(self, sub, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         查找字符串中子字符串第一次出现的位置（下标从0开始），也可指定从某个位置开始查找，或结束查找，找不到会报错，功能同find类似
#         S.index(sub [,start [,end]]) -> int
#
#         Like S.find() but raise ValueError when the substring is not found.
#         """
#         return 0
str_index = 'kd;fjdkl;sfjkd;akd'
print  str_index.index('fj')
#输出：3

#     def isalnum(self):  # real signature unknown; restored from __doc__
#         """
#         判断字符串是否全部是字母和数字
#         S.isalnum() -> bool
#
#         Return True if all characters in S are alphanumeric
#         and there is at least one character in S, False otherwise.
#         """
#         return False
#
str_isalnum = 'dafdfdk;j123'
print str_isalnum.isalnum()
#输出：False
#     def isalpha(self):  # real signature unknown; restored from __doc__
#         """
#         判断字符串是否全部是字母
#         S.isalpha() -> bool
#
#         Return True if all characters in S are alphabetic
#         and there is at least one character in S, False otherwise.
#         """
#         return False
#
#     def isdigit(self):  # real signature unknown; restored from __doc__
#         """
#         判断字符串是否全部是字母和数字
#         S.isdigit() -> bool
#
#         Return True if all characters in S are digits
#         and there is at least one character in S, False otherwise.
#         """
#         return False
#
#     def islower(self):  # real signature unknown; restored from __doc__
#         """
#         判断是否全小写
#         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.
#         """
#         return False
#
#     def isspace(self):  # real signature unknown; restored from __doc__
#         """
#         判断字符串是否为空（包括空格）
#         S.isspace() -> bool
#
#         Return True if all characters in S are whitespace
#         and there is at least one character in S, False otherwise.
#         """
#         return False
#
#     def istitle(self):  # real signature unknown; restored from __doc__
#         """

#         判断是否标题（即：首字母大写，其他全部小写）
#         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.
#         """
#         return False
#
#     def isupper(self):  # real signature unknown; restored from __doc__
#         """
#         判断是否全大写
#         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.
#         """
#         return False
#
#     def join(self, iterable):  # real signature unknown; restored from __doc__
#         """
#         将list、元组等通过一个字符或字符串连接成一个字符串
#         S.join(iterable) -> string
#
#         Return a string which is the concatenation of the strings in the
#         iterable.  The separator between elements is S.
#         """
#         return ""
#
li = ['alex','age']
print '.'.join(li)
#输出：alex.age
#   def ljust(self, width, fillchar=None):  # real signature unknown; restored from __doc__
#         """
#         左对齐,右边填充所给的字符
#         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).
#         """
#         return ""
#
str_ljust = '     hello,where are you from ? ]'
print str_ljust.ljust(40,'*')
print str_ljust.ljust(50,"*")
#输出：
# hello,where are you from ? ]*******
# hello,where are you from ? ]*****************
#     def lower(self):  # real signature unknown; restored from __doc__
#         """
#         将字符串转换为小写
#         S.lower() -> string
#
#         Return a copy of the string S converted to lowercase.
#         """
#         return ""
#
#     def lstrip(self, chars=None):  # real signature unknown; restored from __doc__
#         """
#         去掉字符串左边的空格
#         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
#         """
#         return ""
#
print '   dkla;  fda;   '.lstrip()
#     def partition(self, sep):  # real signature unknown; restored from __doc__
#         """
#         根据的所级字符（或字符串），将原字符串拆分成三个部分组成一个元组，如果所给字符在字符串中找不到，返回的元祖由两个空字符串和原字符串本身组成
#         S.partition(sep) -> (head, sep, tail)
#
#         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.
#         """
#         pass
#
str_partition = 'headseptail'
print str_partition.partition('sep')
#输出：('head', 'sep', 'tail')
#     def replace(self, old, new, count=None):  # real signature unknown; restored from __doc__
#         """
#         替换字符串中的某个部份，可经指定替换几次
#         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.
#         """
#         return ""
#
#     def rfind(self, sub, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         字符串中查找某个字符第一次出现的位置，从右边开始，用法同find(默认从左边开始)
#         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.
#         """
#         return 0
#
print 'dklfkd;fjdklsa'.rfind('dk')
#输出：9
#     def rindex(self, sub, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         字符串中查找某个字符第一次出现的位置，从右边开始，用法同index(默认从左边开始)
#         S.rindex(sub [,start [,end]]) -> int
#
#         Like S.rfind() but raise ValueError when the substring is not found.
#         """
#         return 0
#
#     def rjust(self, width, fillchar=None):  # real signature unknown; restored from __doc__
#         """
#         右对齐,左边填充所给的字符
#         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)
#         """
#         return ""
#
print '   kfdls;k kldjklfdlk     '.rjust(50,'*')
#输出：************************   kfdls;k kldjklfdlk
#     def rpartition(self, sep):  # real signature unknown; restored from __doc__
#         """
#         用法同partition ,只是从右边开始
#         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.
#         """
#         pass
#
#     def rsplit(self, sep=None, maxsplit=None):  # real signature unknown; restored from __doc__
#         """
#         用法同split
#         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.
#         """
#         return []
s_rsplit = 'dkls;jfkdlak;jkdls;af'
print s_rsplit.rsplit(';')
#输出：['dkls', 'jfkdlak', 'jkdls', 'af']
#     def rstrip(self, chars=None):  # real signature unknown; restored from __doc__
#         """
#         去掉字符串右边的空格
#         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
#         """
#         return ""
#
#     def split(self, sep=None, maxsplit=None):  # real signature unknown; restored from __doc__
#         """
#         要据所给字符串字符串拆分成一个list
#         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.
#         """
#         return []
#
#     def splitlines(self, keepends=False):  # real signature unknown; restored from __doc__
#         """
#         S.splitlines(keepends=False) -> 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.
#         """
#         return []
#
#     def startswith(self, prefix, start=None, end=None):  # real signature unknown; restored from __doc__
#         """
#         判断所给字符串是否以所给字符（或字符串）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.
#         """
#         return False
#
#     def strip(self, chars=None):  # real signature unknown; restored from __doc__
#         """
#         去掉字符串左右两边的窗格
#         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
#         """
#         return ""
#
print '  dksl  klds  '.strip()
#输出：dksl  klds
#     def swapcase(self):  # real signature unknown; restored from __doc__
#         """
#         大小写转换，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.
#         """
#         return ""
#
print 'AkdlNkdlKDKLda;'.swapcase()
#输出：aKDLnKDLkdklDA;
#     def title(self):  # real signature unknown; restored from __doc__
#         """
#         字符串首字母大写，其他全部转为小写
#         S.title() -> string
#
#         Return a titlecased version of S, i.e. words start with uppercase
#         characters, all remaining cased characters have lowercase.
#         """
#         return ""
#
print 'kdlsaKDlk'.title()
#输出：Kdlsakdlk
#     def translate(self, table, deletechars=None):  # real signature unknown; restored from __doc__
#         """
#         S.translate(table [,deletechars]) -> string
#
#         Return a copy of the string S, where all characters occurring
#         in the optional argument deletechars are removed, and the
#         remaining characters have been mapped through the given
#         translation table, which must be a string of length 256 or None.
#         If the table argument is None, no translation is applied and
#         the operation simply removes the characters in deletechars.
#         """
#         return ""
#
#     def upper(self):  # real signature unknown; restored from __doc__
#         """
#         字符串全部转为大写
#         S.upper() -> string
#
#         Return a copy of the string S converted to uppercase.
#         """
#         return ""
#
#     def zfill(self, width):  # real signature unknown; restored from __doc__
#         """
#         根据所给宽度，将字符串左边不够的位置上填充0
#         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.
#         """
#         return ""
print '1000'.zfill(8)
#输出：00001000
#     def _formatter_field_name_split(self, *args, **kwargs):  # real signature unknown
#         pass
#
#     def _formatter_parser(self, *args, **kwargs):  # real signature unknown
#         pass
#
#     def __add__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__add__(y) <==> x+y """
#         pass
#
#     def __contains__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__contains__(y) <==> y in x """
#         pass
#
#     def __eq__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__eq__(y) <==> x==y """
#         pass
#
#     def __format__(self, format_spec):  # real signature unknown; restored from __doc__
#         """
#         S.__format__(format_spec) -> string
#
#         Return a formatted version of S as described by format_spec.
#         """
#         return ""
#
#     def __getattribute__(self, name):  # real signature unknown; restored from __doc__
#         """ x.__getattribute__('name') <==> x.name """
#         pass
#
#     def __getitem__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__getitem__(y) <==> x[y] """
#         pass
#
#     def __getnewargs__(self, *args, **kwargs):  # real signature unknown
#         pass
#
#     def __getslice__(self, i, j):  # real signature unknown; restored from __doc__
#         """
#         x.__getslice__(i, j) <==> x[i:j]
#
#                    Use of negative indices is not supported.
#         """
#         pass
#
#     def __ge__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__ge__(y) <==> x>=y """
#         pass
#
#     def __gt__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__gt__(y) <==> x>y """
#         pass
#
#     def __hash__(self):  # real signature unknown; restored from __doc__
#         """ x.__hash__() <==> hash(x) """
#         pass
#
#     def __init__(self, string=''):  # known special case of str.__init__
#         """
#         str(object='') -> string
#
#         Return a nice string representation of the object.
#         If the argument is a string, the return value is the same object.
#         # (copied from class doc)
#         """
#         pass
#
#     def __len__(self):  # real signature unknown; restored from __doc__
#         """ x.__len__() <==> len(x) """
#         pass
#
#     def __le__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__le__(y) <==> x<=y """
#         pass
#
#     def __lt__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__lt__(y) <==> x<y """
#         pass
#
#     def __mod__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__mod__(y) <==> x%y """
#         pass
#
#     def __mul__(self, n):  # real signature unknown; restored from __doc__
#         """ x.__mul__(n) <==> x*n """
#         pass
#
#     @staticmethod  # known case of __new__
#     def __new__(S, *more):  # real signature unknown; restored from __doc__
#         """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
#         pass
#
#     def __ne__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__ne__(y) <==> x!=y """
#         pass
#
#     def __repr__(self):  # real signature unknown; restored from __doc__
#         """ x.__repr__() <==> repr(x) """
#         pass
#
#     def __rmod__(self, y):  # real signature unknown; restored from __doc__
#         """ x.__rmod__(y) <==> y%x """
#         pass
#
#     def __rmul__(self, n):  # real signature unknown; restored from __doc__
#         """ x.__rmul__(n) <==> n*x """
#         pass
#
#     def __sizeof__(self):  # real signature unknown; restored from __doc__
#         """ S.__sizeof__() -> size of S in memory, in bytes """
#         pass
#
#     def __str__(self):  # real signature unknown; restored from __doc__
#         """ x.__str__() <==> str(x) """
#         pass
#
#
# bytes = str