类名str
基本操作
- 切片 [开始位置：结束位置(：步长)]
s = "hello，world！"
取前两个字符 s = [0:2] 0可以省略，切片取头不取尾
反转字符串 s = [-1 : : -1]
取整个字符串 s = [ : ] 后面什么都不写默认取完
- 索引 [索引值] 注：不支持索引修改字符串值，会报错
索引值的范围是0-字符串长度减一，超过这个范围会报错(IndexError: string index out of range)
- 各种方法函数：
def capitalize(self): # real signature unknown; restored from __doc__ #将字符串首字母大写，其余小写 """ 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__ #将不分语种的字符串全部小写 """ 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__ 将字符串填入width长的字符中间，并将其余字符用fillchar填充 """ 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__ 返回sub子序列在字符串指定位置中出现次数，start开始位置，end结束位置 """ 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. """ return 0 def encode(self, encoding='utf-8', errors='strict'): # real signature unknown; restored from __doc__ 改变编码格式 默认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__ 判断字符串是否以suffix子序列结尾，strat开始，end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=8): # real signature unknown; restored from __doc__ 指定制表符/t占有位数，tabsize指定占有位数 """ 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__ 返回在字符串中最先出现的子序列的索引号，如果不存在返回-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(self, *args, **kwargs): # known special case of str.format 字符串格式化 """ 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__ 字符串格式化，指定mapping格式 """ 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__ 返回子序列的索引，无则报错 """ S.index(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. Raises ValueError when the substring is not found. """ return 0 def isalnum(self): # real signature unknown; restored from __doc__ 判断是否全是数字、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. """ return False def isalpha(self): # real signature unknown; restored from __doc__ 判断是否全是字母 """ 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 isdecimal(self): # real signature unknown; restored from __doc__ 判断是否全是十进制数字 """ S.isdecimal() -> bool Return True if there are only decimal characters in S, False otherwise. """ return False def isdigit(self): # real signature unknown; restored from __doc__ 判断是否全是数字 """ 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 isidentifier(self): # real signature unknown; restored from __doc__ 判断是否是有效标识符，用来判断变量命名是否合法 """ 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". """ return False def islower(self): # real signature unknown; restored from __doc__ 判断是否全是小写 """ 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 isnumeric(self): # real signature unknown; restored from __doc__ 判断是否全是数字 """ S.isnumeric() -> bool Return True if there are only numeric characters in S, False otherwise. """ return False def isprintable(self): # real signature unknown; restored from __doc__ 判断是否全可以打印 """ S.isprintable() -> bool Return True if all characters in S are considered printable in repr() or S is empty, False otherwise. """ return False def isspace(self): # real signature unknown; restored from __doc__ 判断是否全是空格、换行符、制表符 """ 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__ 判断是否是标题字符 """ 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. """ return False def isupper(self): # real signature unknown; restored from __doc__ 判断是否全是大写 """ 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__ 生成一个由指定字符串填充连接可迭代字符的字符串 """ 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__ 内容左对齐，右侧填充，默认空格，可选fillchar """ 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__ 将字符串中的所有英文字母小写 """ 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__ 移除左侧空格 """ 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 创建字符映射的转换表 """ 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__ 将字符串分成三部分：sep序列、sep前序列、sep后序列 """ 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__ 替换字符，count指定替换次数 """ 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__ 返回从右往左查找子序列的索引，没找到返回-1 """ 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): # real signature unknown; restored from __doc__ 从右边开始查找子序列，没找到报错 """ S.rindex(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. Raises ValueError when the substring is not found. """ return 0 def rjust(self, width, fillchar=None): # real signature unknown; restored from __doc__ 内容右对齐，左侧填充 """ 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__ 从右边开始，将字符串分成三部分，sep、sep后】sep前 """ 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__ 从右边开始返回按指定分隔符切割指定次数字符串的list """ 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__ 移除右侧空白 """ 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__ 按指定分隔符切割字符串，maxsplit指定切割次数，从左往右 """ 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__ 根据换行符分割字符串 """ 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__ 判断是否以子序列开头 """ 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__ 去除首尾空格 """ 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__ 大写变小写，小写变大写 """ 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__ 将字符串变为title字符 """ 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__ 转换字符，按照table规则 #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__ 大写 """ S.upper() -> str Return a copy of S converted to uppercase. """ return "" def zfill(self, width): # real signature unknown; restored from __doc__ 返回指定长度字符串，原字符串右对齐，左侧填0 """ 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 """ 字符串的加法运算 """ """ 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 """ 比较前后两个字符串是否相等 """ """ Return self==value. """ pass def __format__(self, format_spec): # real signature unknown; restored from __doc__ """ 字符串格式化 """ """ 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 """ 根据索引取值 x.____getitem__(y) <==> x[y] """ """ Return self[key]. """ pass def __getnewargs__(self, *args, **kwargs): # real signature unknown """ 内部调用__new__或创建对象时传入参数使用 """ pass def __ge__(self, *args, **kwargs): # real signature unknown """ 比较左边的字符串的ascii码值是否大于等于右边的ascii码值 """ """ Return self>=value. """ pass def __gt__(self, *args, **kwargs): # real signature unknown """ 比较左边的字符串的ascii码值是否大于右边的ascii码值 """ """ Return self>value. """ pass def __hash__(self, *args, **kwargs): # real signature unknown """ 返回字符串的哈希值 """ """ Return hash(self). """ pass def __init__(self, value='', encoding=None, errors='strict'): # known special case of str.__init__ """ 构造方法，创建string对象时调用 """ """ 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 """ 返回迭代器对象 """ """ Implement iter(self). """ pass def __len__(self, *args, **kwargs): # real signature unknown """ 返回字符串的长度 """ """ Return len(self). """ pass def __le__(self, *args, **kwargs): # real signature unknown """ 比较左边的字符串的ascii码值是否小于等于右边的ascii码值 """ """ Return self<=value. """ pass def __lt__(self, *args, **kwargs): # real signature unknown """ 比较左边的字符串的ascii码值是否小于右边的ascii码值 """ """ Return self<value. """ pass def __mod__(self, *args, **kwargs): # real signature unknown """ Return self%value. """ pass def __mul__(self, *args, **kwargs): # real signature unknown """ 字符串的惩罚运算 """ """ Return self*value.n """ pass @staticmethod # 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与y的值不相等，返回True,相等则返回False """ """ Return self!=value. """ pass def __repr__(self, *args, **kwargs): # real signature unknown """ 转化为解释器可读取的形式 """ """ Return repr(self). """ pass def __rmod__(self, *args, **kwargs): # real signature unknown """ Return value%self. """ pass def __rmul__(self, *args, **kwargs): # real signature unknown """ 字符串的乘法运算 """ """ Return self*value. """ pass def __sizeof__(self): # real signature unknown; restored from __doc__ """ 返回在内存中占用的字节数 """ """ S.__sizeof__() -> size of S in memory, in bytes """ pass def __str__(self, *args, **kwargs): # real signature unknown """ 转化成可读取的形式 """ """ Return str(self). """ pass