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Python字符串对象详解(2)

lidoooudou 2018-01-02 22:32:30 浏览15 评论0
摘要： 首先Python中的字符串对象依赖于str类，类里面包含了我们多使用到的所有方法，代码详见如下：class str(basestring): " ""String object. "" " def __init__(self, object=''): " ""Construct an immutable string.
首先Python中的字符串对象依赖于str类，类里面包含了我们多使用到的所有方法，代码详见如下：
class str(basestring):
    """String object."""

    def __init__(self, object=''):
        """Construct an immutable string.#构造一个不可变的字符串,初始化对象使用

        :type object: object
        """
        pass

    def __add__(self, y):
        """The concatenation of x and y.#连接x和y  x,y均为字符串类型

        :type y: string
        :rtype: string
        """
        return b''

    def __mul__(self, n):
        """n shallow copies of x concatenated.#n浅层副本x连接。就是字符串的n倍出现连接

        :type n: numbers.Integral
        :rtype: str
        """
        return b''

    def __mod__(self, y): #求余
        """x % y.        

        :rtype: string
        """
        return b''

    def __rmul__(self, n):
        """n shallow copies of x concatenated.#n浅层副本x连接。就是字符串的n倍出现连接

:type n: numbers.Integral
        :rtype: str
        """
        return b''

    def __getitem__(self, y):
        """y-th item of x, origin 0.  #实现类似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  #实现首字母大写
        and the rest lowercased.

        :rtype: str
        """
        return b''

    def center(self, width, fillchar=' '):  #中间对齐
        """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): #计算字符在字符串中出现的次数
        """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'): #把字符串转成Unicode对象
        """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'):#转换成指定编码的字符串对象
        """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结尾
        """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):#查找字符串里子字符第一次出现的位置
        """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):#是否全是字母和数字
        """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):#是否全是数字
        """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写
        """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):#是否首字母大写
        """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写
        """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):#字符串的连接
        """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=' '):#输出字符左对齐
        """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写
        """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 默认拆成三部分  
        """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):#字符串替换
        """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):#右侧查找  第一次出现
        """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):##右侧查找  第一次出现位置

"""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=' '):#右对齐
        """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):#从右侧拆分
        """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):#去掉字符串的右侧空格
        """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开头
        """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):#大小写互换
        """Return a copy of the string with uppercase characters converted
        to lowercase and vice versa.

        :rtype: str
        """
        return b''

    def title(self):#标题化字符串
        """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):#大写
        """Return a copy of the string with all the cased characters
        converted to uppercase.

        :rtype: str
        """
        return b''

    def zfill(self, width):#变成特定长度，不足0补齐
        """Return the numeric string left filled with zeros in a string of
        length width.

        :type width: numbers.Integral
        :rtype: str
        """
        return b''
以上是字符串类中的所有方法包含特殊方法。翻译不够准确，请谅解
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Python字符串对象详解(2)

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