字符串string

Posted 2020-12-28 skyzy

字符串string

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): 首字母变大写

S.capitalize() -> string

Return a copy of the string S with only its first character

capitalized.

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

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)

def count(self, sub, start=None, end=None):子序列个数

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

def decode(self, encoding=None, errors=None): 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):编码，针对unicode

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):是否以 xxx 结束

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):将tab转换成空格，默认一个tab转换成8个空格

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.

def find(self, sub, start=None, end=None):寻找子序列位置，如果没找到，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

def format(*args, **kwargs): # known special case of str.format:字符串格式化，动态参数，将函数式编程时细说

S.format(*args, **kwargs) -> string

Return a formatted version of S, using substitutions from args and kwargs.

The substitutions are identified by braces (‘{‘ and ‘}‘).

def index(self, sub, start=None, end=None):子序列位置，如果没找到，报错

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

Like S.find() but raise ValueError when the substring is not found.

return 0

def isalnum(self):是否是字母和数字

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

def isalpha(self):是否是字母

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):是否是数字

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):是否小写

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):

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):

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):

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):连接

S.join(iterable) -> string

Return a string which is the concatenation of the strings in the

iterable. The separator between elements is S.

def ljust(self, width, fillchar=None):内容左对齐，右侧填充

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).

def lower(self):变小写

S.lower() -> string

Return a copy of the string S converted to lowercase.

def lstrip(self, chars=None):移除左侧空白

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

def partition(self, sep):分割，前，中，后三部分

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.

def replace(self, old, new, count=None):替换

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.

def rfind(self, sub, start=None, end=None):

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

def rindex(self, sub, start=None, end=None):

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):

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)

def rpartition(self, sep):

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.

def rsplit(self, sep=None, maxsplit=None):

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 []

def rstrip(self, chars=None):

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

def split(self, sep=None, maxsplit=None):分割， maxsplit最多分割几次

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):根据换行分割

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):是否起始

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):移除两段空白

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

def swapcase(self):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.

def title(self):

S.title() -> string

Return a titlecased version of S, i.e. words start with uppercase

characters, all remaining cased characters have lowercase.

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

intab = "aeiou"

outtab = "12345"

trantab = maketrans(intab, outtab)

str = "this is string example....wow!!!"

print str.translate(trantab, ‘xm‘)

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.

def upper(self):

S.upper() -> string

Return a copy of the string S converted to uppercase.

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。"""

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.

def _formatter_field_name_split(self, *args, **kwargs): # real signature unknown

def _formatter_parser(self, *args, **kwargs): # real signature unknown

def __add__(self, y):

x.__add__(y) <==> x+y

def __contains__(self, y):

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

def __eq__(self, y):

x.__eq__(y) <==> x==y

def __format__(self, format_spec):

S.__format__(format_spec) -> string

Return a formatted version of S as described by format_spec.

def __getattribute__(self, name):

x.__getattribute__(‘name‘) <==> x.name

def __getitem__(self, y):

x.__getitem__(y) <==> x[y]

def __getnewargs__(self, *args, **kwargs): # real signature unknown

def __getslice__(self, i, j):

x.__getslice__(i, j) <==> x[i:j]

def __ge__(self, y):

x.__ge__(y) <==> x>=y

def __gt__(self, y):

x.__gt__(y) <==> x>y

def __hash__(self):

x.__hash__() <==> hash(x)

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.

def __len__(self):

x.__len__() <==> len(x)

def __le__(self, y):

x.__le__(y) <==> x<=y

def __lt__(self, y):

x.__lt__(y) <==> x<y

def __mod__(self, y):

x.__mod__(y) <==> x%y

def __mul__(self, n):

x.__mul__(n) <==> x*n

@staticmethod # known case of __new__

def __new__(S, *more):

T.__new__(S, ...) -> a new object with type S, a subtype of T

def __ne__(self, y):

x.__ne__(y) <==> x!=y

def __repr__(self):

x.__repr__() <==> repr(x)

def __rmod__(self, y):

x.__rmod__(y) <==> y%x

def __rmul__(self, n):

x.__rmul__(n) <==> n*x

def __sizeof__(self):

S.__sizeof__() -> size of S in memory, in bytes

def __str__(self):

x.__str__() <==> str(x)