Python basic data type (-)

Digital

int (integral type)

On a 32-bit machine, the number of integers is 32 bits and the value range is -2**31~2**31-1, which is -2147483648~2147483647
On a 64-bit system, the number of integers is 64 bits and the value range is -2**63~2**63-1, which is -9223372036854775808~9223372036854775807

Boolean value

True or False 1 or 0

String

1  . S. Capitalize ()----First letter capitalized

 1 s="Lifei"2print(S.capitalize ()) -------  Lifei

2. S.center (width, fillchar=none)----Content Center, Width: total length, Filchar: Front and back blank content fill

s="Lifei" print(S.center ("^")) ------ ^^ ^^ ^^ ^lifei^ ^^ ^^ ^^ ^

S.ljust (width, fillchar=none)-------left-aligned, right-filled

s="Lifei" print(S.ljust ("^")) ------lifei^ ^^ ^^ ^^ ^^ ^^ of ^^ ^^

S.rjust (width, fillchar=none)-----Right-aligned, left-padded

s="Lifei" print(S.rjust ("^")) -----^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ Lifei

S.count (Sub, start=none, End=none)------Number of subsequence

s="Lifei" print(S.count ('i', 0,2) ) ------1 (Lifei in I appear several times from left to right greater than or equal to 0 less than 2)

4. s.endswitn (suffix, start=none, end=none)-----Whether to end with * * *

s="Lifei" print(S.endswith ('i', 0,3)) --- ---False (end of Lifei with I ending from left to right greater than or equal to 0 less than 3)

5.s.expandtabs (Tabsize=none)------Turn the TAB key into a space, and the default tab key equals 8 spaces

s="Li\tfei" print(s.expandtabs )------Li Fei (set tab \ t equals 20 spaces)

6.s.find (Sub, Start=none, End=none)-------looking for a subsequence, if not found, returns-1

s="Lifei" print(s.find ('i', 0,3)) ----- 1 (from left to right greater than or equal to 0 less than 3 find I find return 1, cannot find return-1)

S.rfind (Sub, start=none, End=none)------Looking for a subsequence, if not found, returns-1

s="Lifei" print(s.rfind ('i', 0, 3) ) -----1 (from right to left greater than or equal to 0 less than 3 find I find return 1, cannot find return-1)

S.index (Sub, Start=none, End=none)-------looking for a subsequence, if not found, error

s="Lifei" print(S.index ('i', 0,2)) -----1

S.rindex (Sub, start=none, End=none)------Looking for a subsequence, if not found, error

s="Lifei" print(S.rindex ('i', 0,3 )) ----1

7.s.format (*args, **kwargs)-----string Formatting

s="Lifei {0}, Age{1}" print(S.format ('hello'), 20)) #{0} placeholder ------Lifei hello,age20 (hello instead of {0},20 instead of Age{1})

8.s.isalnum ()-----contains letters or numbers, returns true, otherwise False

s="lifei1" print(S.isalnum ()) ------True

S.isalpha ()----All letters, returns TRUE, otherwise False

s="Lifei" print(S.isalpha ()) -------True

S.isdigit ()----All are numbers, return true, otherwise False

s="1lifei" print(S.isdigit ()) ----False

9.s.islower ()-----is lowercase, returns true, otherwise False

s="Lifei" print(S.islower ()) -----True

10.s.isspace ()----Whether it is a space

s="Lifei" print(S.isspace ()) -----False

11.s.istitle ()----Determine if it is a title (all uppercase letters are headings)

s="Lifei" print(S.istitle ()) -----False

12.s.isupper ()---Determine if all uppercase

s="Lifei" print(S.isupper ()) ------True

13.join (self, iterable)------connection

li=["l","H"] #列表
Li= ("1", "H") #元祖 print("_". Join (LI))------L_h

14.s.lower ()----uppercase letters to lowercase

s="Lifei" print(S.lower ()) ------Lifei

S.upper ()------Lowercase to uppercase

s="Lifei" print(S.upper ()) ------Lifei

15.s.lstrip (chars=none)------Remove left space

s=" Lifei " print(S.lstrip ()) -----Lifei

S.rstrip (chars=none)------Remove the right space

s=" Lifei " print(S.rstrip ()) -------Lifei

S.strip (chars=none)------Remove both spaces

s=" Lifei " print(S.strip ()) ------Lifei

16.s.partition (Sep)------segmentation, the first and last three parts (primitive type)

s=" Lifei " print(s.partition ('f')) ----(' Li ', ' f ', ' ei ')

S.rpartition (SET)-----segmentation, the last three parts (primitive type)

s="Lifei" print(s.rpartition (i)) ----(' life ', ' I ', ')

17.s.replace (old, new, count=none)------Replace

s=" Lifei " print(s.replace ('i',' a')) -----LAFEA (i replace a)

18.s.rsplit (Sep=none, Maxsplit=none)------The last three parts of the split (the split character disappears) from the right

s="Lifei" print(s.rsplit ('i')) ------[' L ', ' Fe ', ']

Split (Sep=none, Maxsplit=none)-------the last three parts of the split (the split that character disappears) from the left

s="Lifei" print(s.split ('e')) -----[' Lif ', ' I ']

19.s.splitlines (Keepends=false)------Split by line break

s="Lifei\nlifei" print(S.splitlines ()) -----[' Lifei ', ' Lifei ']

20.s.startswith (prefix, start=none, end=none)------Determine if a character begins

s="Lifei" print(S.startswith ('L')) ----True

S.swapcase ()-----Uppercase to lowercase, lowercase to uppercase

s="Lifei" print(S.swapcase ()) -----Lifei

22.s.title ()------content into a title

s="my name is Lifei" print(S.title ()) -----My name is Lifei

Python basic data type (-)