天天看點

python中str是什麼資料類型_python基本資料類型之str

#!/usr/bin/env python#-*- coding: utf-8 -*-

"""基本資料類型之str"""

classstr(object):"""str(object='') -> str

str(bytes_or_buffer[, encoding[, errors]]) -> str

Create a new string object from the given object. If encoding or

errors is specified, then the object must expose a data buffer

that will be decoded using the given encoding and error handler.

Otherwise, returns the result of object.__str__() (if defined)

or repr(object).

encoding defaults to sys.getdefaultencoding().

errors defaults to 'strict'."""

def capitalize(self): #real signature unknown; restored from __doc__

"""将字元串的第一個字母變為大寫,其他字母變為小寫"""

"""S.capitalize() -> str

Return a capitalized version of S, i.e. make the first character

have upper case and the rest lower case."""

return ""

def casefold(self): #real signature unknown; restored from __doc__

"""将字元串中的字母變為小寫,與lowwer()的差別是。lower僅對英文有效,casefold還對非中、英文有效"""

"""S.casefold() -> str

Return a version of S suitable for caseless comparisons."""

return ""

def center(self, width, fillchar=None): #real signature unknown; restored from __doc__

"""内容居中,width為總長度,fillchar為填充字元,預設為空格"""

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

Return S centered in a string of length width. Padding is

done using the specified fill character (default is a space)"""

return ""

def count(self, sub, start=None, end=None): #real signature unknown; restored from __doc__

"""傳回子序列在字元串中出現的次數,start為開始位置,end為結束位置"""

"""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."""

return0def encode(self, encoding='utf-8', errors='strict'): #real signature unknown; restored from __doc__

"""編碼,預設是utf-8"""

"""S.encode(encoding='utf-8', errors='strict') -> bytes

Encode S using the codec registered for encoding. Default encoding

is 'utf-8'. 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 can handle UnicodeEncodeErrors."""

return b""

def endswith(self, suffix, start=None, end=None): #real signature unknown; restored from __doc__

"""判斷字序列是否以suffix結尾,start為開始位置,end為結束位置"""

"""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."""

returnFalsedef expandtabs(self, tabsize=8): #real signature unknown; restored from __doc__

"""将"\t"符号轉換成空格,tab的預設空格數為8,可以通過改變tabsize來改變代表的空格數"""

"""S.expandtabs(tabsize=8) -> str

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 ""

def find(self, sub, start=None, end=None): #real signature unknown; restored from __doc__

"""傳回子序列的索引,如果沒有找到則傳回-1,start為開始位置,end為結束位置"""

"""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."""

return0def format(self, *args, **kwargs): #known special case of str.format

"""字元串格式化"""

"""S.format(*args, **kwargs) -> str

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

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

pass

def format_map(self, mapping): #real signature unknown; restored from __doc__

"""字元串格式化"""

"""S.format_map(mapping) -> str

Return a formatted version of S, using substitutions from mapping.

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

return ""

def index(self, sub, start=None, end=None): #real signature unknown; restored from __doc__

"""傳回子序列的索引,如果沒有找到則報ValueError"""

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

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

return0def isalnum(self): #real signature unknown; restored from __doc__

"""判斷是否是數字、字母"""

"""S.isalnum() -> bool

Return True if all characters in S are alphanumeric

and there is at least one character in S, False otherwise."""

returnFalsedef isalpha(self): #real signature unknown; restored from __doc__

"""判斷是否是字母"""

"""S.isalpha() -> bool

Return True if all characters in S are alphabetic

and there is at least one character in S, False otherwise."""

returnFalsedef isdecimal(self): #real signature unknown; restored from __doc__

"""判斷是否僅由十進制字元組成"""

"""S.isdecimal() -> bool

Return True if there are only decimal characters in S,

False otherwise."""

returnFalsedef isdigit(self): #real signature unknown; restored from __doc__

"""判斷是否是數字"""

"""S.isdigit() -> bool

Return True if all characters in S are digits

and there is at least one character in S, False otherwise."""

returnFalsedef isidentifier(self): #real signature unknown; restored from __doc__

"""判斷是否是有效的python辨別符,可以用來判斷變量名是否合法"""

"""S.isidentifier() -> bool

Return True if S is a valid identifier according

to the language definition.

Use keyword.iskeyword() to test for reserved identifiers

such as "def" and "class"."""

returnFalsedef islower(self): #real signature unknown; restored from __doc__

"""判斷是否是小寫"""

"""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."""

returnFalsedef isnumeric(self): #real signature unknown; restored from __doc__

"""檢測是否僅由數字組成"""

"""S.isnumeric() -> bool

Return True if there are only numeric characters in S,

False otherwise."""

returnFalsedef isprintable(self): #real signature unknown; restored from __doc__

"""檢測字元串中是否都為可列印字元"""

"""S.isprintable() -> bool

Return True if all characters in S are considered

printable in repr() or S is empty, False otherwise."""

returnFalsedef isspace(self): #real signature unknown; restored from __doc__

"""判斷是否是空格、tab、換行"""

"""S.isspace() -> bool

Return True if all characters in S are whitespace

and there is at least one character in S, False otherwise."""

returnFalsedef istitle(self): #real signature unknown; restored from __doc__

"""判斷是否首字母大寫,其他字母小寫"""

"""S.istitle() -> bool

Return True if S is a titlecased string and there is at least one

character in S, i.e. upper- and titlecase characters may only

follow uncased characters and lowercase characters only cased ones.

Return False otherwise."""

returnFalsedef isupper(self): #real signature unknown; restored from __doc__

"""判斷是否都為大寫字母"""

"""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."""

returnFalsedef join(self, iterable): #real signature unknown; restored from __doc__

"""将序列中的元素以指定的字元連接配接生成一個新的字元串"""

"""S.join(iterable) -> str

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

iterable. The separator between elements is S."""

return ""

def ljust(self, width, fillchar=None): #real signature unknown; restored from __doc__

"""内容左對齊,右側進行填充,width為長度,fillchar為填充字元,預設是空格"""

"""S.ljust(width[, fillchar]) -> str

Return S left-justified in a Unicode string of length width. Padding is

done using the specified fill character (default is a space)."""

return ""

def lower(self): #real signature unknown; restored from __doc__

"""轉換為小寫"""

"""S.lower() -> str

Return a copy of the string S converted to lowercase."""

return ""

def lstrip(self, chars=None): #real signature unknown; restored from __doc__

"""移除左側填充,預設為空白"""

"""S.lstrip([chars]) -> str

Return a copy of the string S with leading whitespace removed.

If chars is given and not None, remove characters in chars instead."""

return ""

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

"""用于建立字元映射的轉換表,對于接受兩個參數的最簡單的調用方式,

第一個參數是字元串,表示需要轉換的字元,

第二個參數也是字元串,表示轉換的目标

需要注意的是,兩個參數的長度必須一緻,為一一對應的關系

使用str.maketrans()來調用"""

"""Return a translation table usable for str.translate().

If there is only one argument, it must be a dictionary mapping Unicode

ordinals (integers) or characters to Unicode ordinals, strings or None.

Character keys will be then converted to ordinals.

If there are two arguments, they must be strings of equal length, and

in the resulting dictionary, each character in x will be mapped to the

character at the same position in y. If there is a third argument, it

must be a string, whose characters will be mapped to None in the result."""

pass

def partition(self, sep): #real signature unknown; restored from __doc__

"""将字元串分割為三部分,子序列前的部分,子序列,子序列後的部分"""

"""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."""

pass

def replace(self, old, new, count=None): #real signature unknown; restored from __doc__

"""替換"""

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

Return a copy of 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__

"""從右邊開始查找,找到了傳回子序列的索引,沒找到傳回-1,start為開始位置,end為結束位置"""

"""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."""

return0def rindex(self, sub, start=None, end=None): #real signature unknown; restored from __doc__

"""從右邊開始查找,找到了傳回子序列的索引,沒找到就報錯,start為開始位置,end為結束位置"""

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

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

return0def rjust(self, width, fillchar=None): #real signature unknown; restored from __doc__

"""内容右對齊,左側填充,width為長度,fillchar為填充字元,預設是空格"""

"""S.rjust(width[, fillchar]) -> str

Return S right-justified in a string of length width. Padding is

done using the specified fill character (default is a space)."""

return ""

def rpartition(self, sep): #real signature unknown; restored from __doc__

"""從右邊開始将字元串分割為三部分,子序列前的部分,子序列,子序列後的部分"""

"""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=-1): #real signature unknown; restored from __doc__

"""通過指定分隔符從右邊對字元串進行切片,maxsplit表示分割幾次"""

"""S.rsplit(sep=None, maxsplit=-1) -> list of strings

Return a list of the words in 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, any whitespace string

is a separator."""

return[]def rstrip(self, chars=None): #real signature unknown; restored from __doc__

"""移除右側空白"""

"""S.rstrip([chars]) -> str

Return a copy of the string S with trailing whitespace removed.

If chars is given and not None, remove characters in chars instead."""

return ""

def split(self, sep=None, maxsplit=-1): #real signature unknown; restored from __doc__

"""通過指定分隔符對字元串進行切片,maxsplit表示分割幾次"""

"""S.split(sep=None, maxsplit=-1) -> list of strings

Return a list of the words in 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=None): #real signature unknown; restored from __doc__

"""根據換行分割"""

"""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."""

return[]def startswith(self, prefix, start=None, end=None): #real signature unknown; restored from __doc__

"""判斷是否以子序列開頭,start為開始位置,end為結束位置"""

"""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."""

returnFalsedef strip(self, chars=None): #real signature unknown; restored from __doc__

"""去除兩側空白"""

"""S.strip([chars]) -> str

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."""

return ""

def swapcase(self): #real signature unknown; restored from __doc__

"""大寫變小寫,小寫變大寫"""

"""S.swapcase() -> str

Return a copy of S with uppercase characters converted to lowercase

and vice versa."""

return ""

def title(self): #real signature unknown; restored from __doc__

"""将開頭字母大寫,其他字母小寫"""

"""S.title() -> str

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

characters, all remaining cased characters have lower case."""

return ""

def translate(self, table): #real signature unknown; restored from __doc__

"""轉換,需要先做一個對應表,可以用str.maketrans()來做對應表

intab = "aeiou"

outtab = "12345"

trantab = str.maketrans(intab, outtab)

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

print s.translate(trantab)"""

"""S.translate(table) -> str

Return a copy of the string S in which each character has been mapped

through the given translation table. The table must implement

lookup/indexing via __getitem__, for instance a dictionary or list,

mapping Unicode ordinals to Unicode ordinals, strings, or None. If

this operation raises LookupError, the character is left untouched.

Characters mapped to None are deleted."""

return ""

def upper(self): #real signature unknown; restored from __doc__

"""轉換成大寫"""

"""S.upper() -> str

Return a copy of S converted to uppercase."""

return ""

def zfill(self, width): #real signature unknown; restored from __doc__

"""傳回指定長度的字元串,原字元串右對齊,前面用0填充"""

"""S.zfill(width) -> str

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 ""

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

"""字元串的加法運算"""

"""Return self+value."""

pass

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

"""是否包含"""

"""Return key in self."""

pass

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

"""比較前後兩個字元串是否相等"""

"""Return self==value."""

pass

def __format__(self, format_spec): #real signature unknown; restored from __doc__

"""字元串格式化"""

"""S.__format__(format_spec) -> str

Return a formatted version of S as described by format_spec."""

return ""

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

"""x.__getattribute__('name') <==> x.name"""

"""Return getattr(self, name)."""

pass

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

"""根據索引取值 x.____getitem__(y) <==> x[y]"""

"""Return self[key]."""

pass

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

"""内部調用__new__或建立對象時傳入參數使用"""

pass

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

"""比較左邊的字元串的ascii碼值是否大于等于右邊的ascii碼值"""

"""Return self>=value."""

pass

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

"""比較左邊的字元串的ascii碼值是否大于右邊的ascii碼值"""

"""Return self>value."""

pass

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

"""傳回字元串的哈希值"""

"""Return hash(self)."""

pass

def __init__(self, value='', encoding=None, errors='strict'): #known special case of str.__init__

"""構造方法,建立string對象時調用"""

"""str(object='') -> str

str(bytes_or_buffer[, encoding[, errors]]) -> str

Create a new string object from the given object. If encoding or

errors is specified, then the object must expose a data buffer

that will be decoded using the given encoding and error handler.

Otherwise, returns the result of object.__str__() (if defined)

or repr(object).

encoding defaults to sys.getdefaultencoding().

errors defaults to 'strict'.

# (copied from class doc)"""

pass

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

"""傳回疊代器對象"""

"""Implement iter(self)."""

pass

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

"""傳回字元串的長度"""

"""Return len(self)."""

pass

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

"""比較左邊的字元串的ascii碼值是否小于等于右邊的ascii碼值"""

"""Return self<=value."""

pass

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

"""比較左邊的字元串的ascii碼值是否小于右邊的ascii碼值"""

"""Return self

pass

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

"""Return self%value."""

pass

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

"""字元串的懲罰運算"""

"""Return self*value.n"""

[email protected]#known case of __new__

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

"""Create and return a new object. See help(type) for accurate signature."""

pass

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

"""x.__ne__(y) 如果x與y的值不相等,傳回True,相等則傳回False"""

"""Return self!=value."""

pass

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

"""轉化為解釋器可讀取的形式"""

"""Return repr(self)."""

pass

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

"""Return value%self."""

pass

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

"""字元串的乘法運算"""

"""Return self*value."""

pass

def __sizeof__(self): #real signature unknown; restored from __doc__

"""傳回在記憶體中占用的位元組數"""

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

pass

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

"""轉化成可讀取的形式"""

"""Return str(self)."""

pass