python数据类型取值范围_Python基本数据类型（⼀）classstr(bastring):"""str(object='') -> string
Return a nice string reprentation of the object.
If the argument is a string, the return value is the same object."""
defcapitalize(lf):"""⾸字母变⼤写"""
"""S.capitalize() -> string
Return a copy of the string S with only its first character再别康桥英文版
capitalized."""
return ""
def center(lf, 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)"""
return ""
def count(lf, 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."""
return0def decode(lf, 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 t a different error
handling scheme. Default is 'strict' meaning that encoding errors rai
a UnicodeDecodeError. Other possible values are 'ignore' and 'replace'
as well as any other name registered ister_error that ismardi gras
able to handle UnicodeDecodeErrors."""
returnobject()def encode(lf, 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 t a different error
handling scheme. Default is 'strict' meaning that encoding errors rai
a UnicodeEncodeError. Other possible values are 'ignore', 'replace' and
'xmlcharrefreplace' as well as any other name registered with
returnobject()def endswith(lf, 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, Fal otherwi.
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."""
returnFaldef expandtabs(lf, tabsize=None):"""将tab转换成空格，默认⼀个tab转换成8个空格"""面试 缺点>orgy
"""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."""
return ""
def find(lf, 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."""
return0def format(*args, **kwargs): #known special ca 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 '}')."""
pass
def index(lf, 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() butrai ValueError when the substring is notfound."""return 0
def isalnum(lf):""" 是否是字母和数字 """
"""S.isalnum()->bool
Return Trueif all characters inS are alphanumericand there is at least one character inS, Fal otherwi."""return Fal def isalpha(lf):""" 是否是字母 """
gamma functions"""S.isalpha()->bool
Return Trueif all characters inS are alphabeticand there is at least one character inS, Fal otherwi."""return Fal def isdigit(lf):""" 是否是数字 """
"""S.isdigit()->bool
Return Trueif all characters inS are digitsand there is at least one character inS, Fal otherwi."""return Fal
def islower(lf):""" 是否⼩写 """
"""S.islower()->bool
Return Trueif all cad characters in S are lowerca and there isat least one cad characterinS, Fal otherwi."""return Fal
def isspace(lf):"""S.isspace()->bool
Return Trueif all characters inS are whitespaceand there is at least one character inS, Fal otherwi."""return Fal
教育部考试中心雅思def istitle(lf):"""S.istitle()->bool
Return Trueif S is a titlecad string and there isat least one
characterinS, i.e. upperca characters may only follow uncad
charactersandlowerca characters only cad ones. Return Fal
otherwi."""return Fal
def isupper(lf):"""S.isupper()->bool
用醋洗脸的方法Return Trueif all cad characters in S are upperca and there isat least one cad characterinS, Fal otherwi."""return Fal
def join(lf, iterable):""" 连接 """
"""S.join(iterable)->string
Return a string whichis the concatenation of the strings inthe
iterable. The parator between elementsisS."""return ""
def ljust(lf, 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 isdone using the specified fill character (defaultisa space)."""return ""
def lower(lf):""" 变⼩写 """
"""S.lower()->stringassociate是什么意思
Return a copy of the string S converted to lowerca."""return ""
def lstrip(lf, chars=None):""" 移除左侧空⽩ """
"""S.lstrip([chars])-> string orunicode
Return a copy of the string S with leading whitespace removed.
If charsis given and not None, remove characters inchars instead.
If charsisunicode, S will be converted to unicode before stripping"""return ""
def partition(lf, p):""" 分割，前，中，后三部分 """
"""S.partition(p)->(head, p, tail)
Searchfor the parator p in S, and returnthe part before it,
the parator itlf,and the part after it. If the parator is notfound,return S andtwo empty strings."""pass
def replace(lf, 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 countisgiven, only the first count occurrences are replaced."""return ""
def rfind(lf, sub, start=None, end=None):"""S.rfind(sub [,start [,end]])->int
Return the highest indexin S where substring sub isfound,
such that subiscontained within S[start:end]. Optional
arguments startand end are interpreted as inslice notation.
Return-1on failure."""return 0
def rindex(lf, sub, start=None, end=None):"""S.rindex(sub [,start [,end]])->int
Like S.rfind() butrai ValueError when the substring is notfound."""return 0
def rjust(lf, width, fillchar=None):"""S.rjust(width[, fillchar])->string
Return S right-justified in a string of length width. Padding isdone using the specified fill character (defaultisa space)"""return ""
def rpartition(lf, p):"""S.rpartition(p)->(head, p, tail)
Searchfor the parator p in S, starting at the end of S, and returnthe part before it, the parator itlf,andthe part after it. If the
paratoris not found, return two empty strings andS."""pass
def rsplit(lf, p=None, maxsplit=None):"""S.rsplit([p [,maxsplit]])->list of strings
Return a list of the wordsinthe string S, using p as the
delimiter string, starting at the end of the stringandworking
to the front. If maxsplitisgiven, at most maxsplit splits are
done. If pis not specified or isNone, any whitespace stringisa parator."""return []
def rstrip(lf, chars=None):"""S.rstrip([chars])-> string orunicode
Return a copy of the string S with trailing whitespace removed.
If charsis given and not None, remove characters inchars instead.
If charsisunicode, S will be converted to unicode before stripping"""return ""
def split(lf, p=None, maxsplit=None):""" 分割， maxsplit最多分割⼏次 """
"""S.split([p [,maxsplit]])->list of strings
Return a list of the wordsinthe string S, using p as the
delimiter string. If maxsplitisgiven, at most maxsplit
splits are done. If pis not specified or isNone, any
whitespace stringis a parator andempty strings are removedfromthe result."""return []
def splitlines(lf, keepends=Fal):""" 根据换⾏分割 """
"""S.splitlines(keepends=Fal) ->list of strings
Return a list of the linesinS, breaking at line boundaries.
Line breaks arenot included inthe resulting list unless keependsis given andtrue."""return []
def startswith(lf, prefix, start=None, end=None):""" 是否起始 """
"""S.startswith(prefix[, start[, end]])->bool
Return TrueifS starts with the specified prefix, Fal otherwi.
With optional start, test S beginning at that position.
With optional end, stop comparing S at that position.
naiceprefix can also be a tuple of strings totry."""return Fal
def strip(lf, chars=None):""" 移除两段空⽩ """
"""S.strip([chars])-> string orunicode
Return a copy of the string S with leadingandtrailing
国际音标whitespace removed.
If charsis given and not None, remove characters inchars instead.
If charsisunicode, S will be converted to unicode before stripping"""return ""
def swapca(lf):""" ⼤写变⼩写，⼩写变⼤写 """
"""S.swapca()->string
Return a copy of the string S with upperca characters
converted to lowercaandvice versa."""return ""
def title(lf):"""S.title()->string
Return a titlecad version of S, i.e. words start with upperca
characters, all remaining cad characters have lowerca."""return ""
def translate(lf, 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 wow"
anslate(trantab, 'xm')"""
"""S.translate(table [,deletechars])->string
Return a copy of the string S, where all characters occurringin the optional argument deletechars are removed, andthe
remaining characters have been mapped through the given
translation table, which must be a string of length256 orNone.
If the table argumentis None, no translation is applied andthe operation simply removes the charactersindeletechars."""return ""
def upper(lf):"""S.upper()->string
Return a copy of the string S converted to upperca."""return ""
def zfill(lf, 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。"""
