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python字符串（2）
首先Python中的字符串對象依賴於str類，類裏麵包含了我們多使用到的所有方法，代碼詳見如下：class str(basestring):
"""String object."""
def __init__(self, object=''):
"""Construct an immutable string.#構造一個不可變的字符串,初始化對象使用
:type object: object
"""
pass
def __add__(self, y):
"""The concatenation of x and y.#連接x和y x,y均為字符串類型
:type y: string
:rtype: string
"""
return b''
def __mul__(self, n):
"""n shallow copies of x concatenated.#n淺層副本x連接。就是字符串的n倍出現連接
:type n: numbers.Integral
:rtype: str
"""
return b''
def __mod__(self, y): #求餘
"""x % y.
:rtype: string
"""
return b''
def __rmul__(self, n):
"""n shallow copies of x concatenated.#n淺層副本x連接。就是字符串的n倍出現連接
:type n: numbers.Integral
:rtype: str
"""
return b''
def __getitem__(self, y):
"""y-th item of x, origin 0. #實現類似slice的切片功能
:type y: numbers.Integral
:rtype: str
"""
return b''
def __iter__(self): #迭代器
"""Iterator over bytes.
:rtype: collections.Iterator[str]
"""
return []
def capitalize(self):
"""Return a copy of the string with its first character capitalized #實現首字母大寫
and the rest lowercased.
:rtype: str
"""
return b''
def center(self, width, fillchar=' '): #中間對齊
"""Return centered in a string of length width.
:type width: numbers.Integral
:type fillchar: str
:rtype: str
"""
return b''
def count(self, sub, start=None, end=None): #計算字符在字符串中出現的次數
"""Return the number of non-overlapping occurrences of substring
sub in the range [start, end].
:type sub: string
:type start: numbers.Integral | None
:type end: numbers.Integral | None
:rtype: int
"""
return 0
def decode(self, encoding='utf-8', errors='strict'): #把字符串轉成Unicode對象
"""Return a string decoded from the given bytes.
:type encoding: string
:type errors: string
:rtype: unicode
"""
return ''
def encode(self, encoding='utf-8', errors='strict'):#轉換成指定編碼的字符串對象
"""Return an encoded version of the string as a bytes object.
:type encoding: string
:type errors: string
:rtype: str
"""
return b''
def endswith(self, suffix, start=None, end=None):#是否已xx結尾
"""Return True if the string ends with the specified suffix,
otherwise return False.
:type suffix: string | tuple
:type start: numbers.Integral | None
:type end: numbers.Integral | None
:rtype: bool
"""
return False
def find(self, sub, start=None, end=None):#字符串的查找
"""Return the lowest index in the string where substring sub is
found, such that sub is contained in the slice s[start:end].
:type sub: string
:type start: numbers.Integral | None
:type end: numbers.Integral | none
:rtype: int
"""
return 0
def format(self, *args, **kwargs):#格式化字符串
"""Perform a string formatting operation.
:rtype: string
"""
return ''
def index(self, sub, start=None, end=None):#查找字符串裏子字符第一次出現的位置
"""Like find(), but raise ValueError when the substring is not
found.
:type sub: string
:type start: numbers.Integral | None
:type end: numbers.Integral | none
:rtype: int
"""
return 0
def isalnum(self):#是否全是字母和數字
"""Return true if all characters in the string are alphanumeric and
there is at least one character, false otherwise.
:rtype: bool
"""
return False
def isalpha(self):#是否全是字母
"""Return true if all characters in the string are alphabetic and there
is at least one character, false otherwise.
:rtype: bool
"""
return False
def isdigit(self):#是否全是數字
"""Return true if all characters in the string are digits and there
is at least one character, false otherwise.
:rtype: bool
"""
return False
def islower(self):#字符串中的字母是否全是小寫
"""Return true if all cased characters in the string are lowercase
and there is at least one cased character, false otherwise.
:rtype: bool
"""
return False
def isspace(self):#是否全是空白字符
"""Return true if there are only whitespace characters in the
string and there is at least one character, false otherwise.
:rtype: bool
"""
return False
def istitle(self):#是否首字母大寫
"""Return true if the string is a titlecased string and there is at
least one character, for example uppercase characters may only
follow uncased characters and lowercase characters only cased ones.
:rtype: bool
"""
return False
def isupper(self):#字符串中的字母是都大寫
"""Return true if all cased characters in the string are uppercase
and there is at least one cased character, false otherwise.
:rtype: bool
"""
return False
def join(self, iterable):#字符串的連接
"""Return a string which is the concatenation of the strings in the
iterable.
:type iterable: collections.Iterable[string]
:rtype: string
"""
return ''
def ljust(self, width, fillchar=' '):#輸出字符左對齊
"""Return the string left justified in a string of length width.
Padding is done using the specified fillchar (default is a space).
:type width: numbers.Integral
:type fillchar: str
:rtype: str
"""
return b''
def lower(self):#字符中的字母是否全是小寫
"""Return a copy of the string with all the cased characters
converted to lowercase.
:rtype: str
"""
return b''
def lstrip(self, chars=None):#取出空格及特殊字符
"""Return a copy of the string with leading characters removed.
:type chars: string | None
:rtype: str
"""
return b''
def partition(self, sep):#字符串拆分 默認拆成三部分
"""Split the string at the first occurrence of sep, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator.
:type sep: string
:rtype: (str, str, str)
"""
return b'', b'', b''
def replace(self, old, new, count=-1):#字符串替換
"""Return a copy of the string with all occurrences of substring
old replaced by new.
:type old: string
:type new: string
:type count: numbers.Integral
:rtype: string
"""
return ''
def rfind(self, sub, start=None, end=None):#右側查找 第一次出現
"""Return the highest index in the string where substring sub is
found, such that sub is contained within s[start:end].
:type sub: string
:type start: numbers.Integral | None
:type end: numbers.Integral | none
:rtype: int
"""
return 0
def rindex(self, sub, start=None, end=None):##右側查找 第一次出現位置
"""Like rfind(), but raise ValueError when the substring is not
found.
:type sub: string
:type start: numbers.Integral | None
:type end: numbers.Integral | none
:rtype: int
"""
return 0
def rjust(self, width, fillchar=' '):#右對齊
"""Return the string right justified in a string of length width.
Padding is done using the specified fillchar (default is a space).
:type width: numbers.Integral
:type fillchar: string
:rtype: string
"""
return ''
def rpartition(self, sep):#從右側拆分
"""Split the string at the last occurrence of sep, and return a
3-tuple containing the part before the separator, the separator
itself, and the part after the separator.
:type sep: string
:rtype: (str, str, str)
"""
return b'', b'', b''
def rsplit(self, sep=None, maxsplit=-1):#字符串的分割
"""Return a list of the words in the string, using sep as the
delimiter string.
:type sep: string | None
:type maxsplit: numbers.Integral
:rtype: list[str]
"""
return []
def rstrip(self, chars=None):#去掉字符串的右側空格
"""Return a copy of the string with trailing characters removed.
:type chars: string | None
:rtype: str
"""
return b''
def split(self, sep=None, maxsplit=-1):#字符串的切割
"""Return a list of the words in the string, using sep as the
delimiter string.
:type sep: string | None
:type maxsplit: numbers.Integral
:rtype: list[str]
"""
return []
def splitlines(self, keepends=False):#把字符串按照行切割成list
"""Return a list of the lines in the string, breaking at line
boundaries.
:type keepends: bool
:rtype: list[str]
"""
return []
def startswith(self, prefix, start=None, end=None):#以xx開頭
"""Return True if string starts with the prefix, otherwise return
False.
:type prefix: string | tuple
:type start: numbers.Integral | None
:type end: numbers.Integral | None
:rtype: bool
"""
return False
def strip(self, chars=None):#去除左右空格
"""Return a copy of the string with the leading and trailing
characters removed.
:type chars: string | None
:rtype: str
"""
return b''
def swapcase(self):#大小寫互換
"""Return a copy of the string with uppercase characters converted
to lowercase and vice versa.
:rtype: str
"""
return b''
def title(self):#標題化字符串
"""Return a titlecased version of the string where words start with
an uppercase character and the remaining characters are lowercase.
:rtype: str
"""
return b''
def upper(self):#大寫
"""Return a copy of the string with all the cased characters
converted to uppercase.
:rtype: str
"""
return b''
def zfill(self, width):#變成特定長度，不足0補齊
"""Return the numeric string left filled with zeros in a string of
length width.
:type width: numbers.Integral
:rtype: str
"""
return b''
以上是字符串類中的所有方法包含特殊方法。翻譯不夠準確，請諒解最後更新：2017-06-25 22:35:23