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This article mainly introduces what basic data types Python has. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

Operator 1. Numeric operation

II. Comparison operation

III. Assignment operation

IV. Logical operation

Fifth, membership operation

Basic data types 1. Numbers

Int (Integer)

On a 32-bit machine, the number of bits of an integer is 32 bits, with values ranging from-231 to 231-1, that is,-2147483648 to 2147483647

On a 64-bit system, the number of bits of an integer is 64 bits, and the range of values is-263-1, that is,-92233720368547758089223372036854775807

-int converts a string to a number a = "123" print (type (a), a) b = int (a) print (type (b), b) num =" 0011 "v = int (num, base=16) print (v)-bit_lenght # the binary of the current number, with at least n bits representing the r = age.bit_length () binary string

Once a string is created, it cannot be modified

Once modified or concatenated, the string will be regenerated.

Common functions of string

Join

Split

Find

Strip

Upper

Lower

Replace

# 1 initials # test = "aLex" # v = test.capitalize () # print (v) # 2 all lowercase, casefold more powerful, many unknown to the corresponding lowercase # v1 = test.casefold () # print (v1) # v2 = test.lower () # print (v2) # 3, and center the content # 20 refers to the total length # * blank unknown fill, one character Optional # v = test.center (20, "medium") # print (v) # test = "alex" # v = test.ljust (20, "*") # print (v) # test = "alex" # v = test.rjust (20, "*") # print (v) # test = "alex" # v = test.zfill (20) # print (v) # 4 look in the string Number of times to find subsequences # test = "aLexalexr" # v = test.count ('ex') # print (v) # test = "aLexalexr" # v = test.count (' ex') 5 print 6) # print (v) # 5 # what ends # what begins # test = "alex" # v = test.endswith ('ex') # v = test.startswith (' ex') # print (v) # 6 expandtabs, break sentence 20 # test = # v = test.expandtabs (20) # print (v) # 7 after finding the first one, get its unknown # > or > = # test = "alexalex" # not found-1 # v = test.find ('ex') # print (v) # 8 index cannot be found Ignore error # test = "alexalex" # v = test.index ('8') # print (v) # 9 format Replace the placeholder in a string with the specified value # test ='I am {name}, age {a}'# print (test) # v = test.format (name='alex',a=19) # print (v) # test ='I am {0}, age {1}'# print (test) # v = test.format ('alex',19) # print (v) # 10 format The value passed in {"name": 'alex', "a": 19} # test =' I am {name}, age {a}'# v1 = test.format (name='df',a=10) # v2 = test.format_map ({"name": 'alex' "a": 19}) whether the # 11 string contains only letters and numbers # test = "123" # v = test.isalnum () # print (v) # str# 12 is a letter Man # test = "as2df" # v = test.isalpha () # print (v) # 13 whether the current input is the number # test = "two" # 1 ② # v1 = test.isdecimal () # v2 = test.isdigit () # v3 = test.isnumeric () # print V3) # 14 whether there is an undisplayable character #\ t tab #\ nnewline # test = "oiuas\ tdfkj" # v = test.isprintable () # print (v) # 15 determine whether it is all spaces # test = "" v = test.isspace () # print (v) # 16 determine whether it is the title # test = "Return True if all cased characters in S are" Uppercase and there is "# v1 = test.istitle () # print (v1) # v2 = test.title () # print (v2) # v3 = v2.istitle () # print (v3) # 17 * concatenate each element in the string according to the specified delimiter # test =" you are the wind and I am the sand "# print (test) # # t =''# V = "_" .join (test) # print (v) # 18 determine whether it is all uppercase and lowercase # test = "Alex" # v1 = test.islower () # v2 = test.lower () # print (v1) V2) # v1 = test.isupper () # v2 = test.upper () # print (v1) V2) # 19 # remove specified string # test = "xa" # # v = test.lstrip ('xa') # v = test.rstrip (' 9lexxexa') # # v = test.strip ('xa') # print (v) # test.lstrip () # test.rstrip () # test.strip () # remove left and right white space # V = test.lstrip () # v = test.rstrip () # v = test.strip () # print (v) # print (test) # remove\ t\ n # v = test.lstrip () # v = test.rstrip () # v = test.strip () # print (v) # 20 correspondence replacement # test = "aeiou" # test1 = "12345" # v = "asidufkasd" Fiuadkf Adfkjalsdjf "# m = str.maketrans (" aeiou "," 12345 ") # new_v = v.translate (m) # print (new_v) # 21 divided into three parts # test =" testasdsddfg "# v = test.partition ('s') # print (v) # v = test.rpartition ('s') # print (v) # 22 divided into specified number # v = test.split ('s') 2) # print (v) # test.rsplit () # 23 Segment Only based on, true,false: whether to keep the newline # test = "asdfadfasdf\ nasdfasdf\ nadfasdf" # v = test.splitlines (False) # print (v) # 24 starts with xxx Ends with xx # test = "backend 1.1.1.1" # v = test.startswith ('a') # print (v) # test.endswith ('a) # 25 case conversion # test = "aLex" # v = test.swapcase () # print (v) # 26 letters, numbers Underscore: identifier def class # a = "def" # v = a.isidentifier () # print (v) # 27 replaces the specified string with the specified string # test = "alexalexalex" # v = test.replace ("ex", 'bbb') # print (v) # v = test.replace ("ex",' bbb') 2) # print (v) # I. for loop # for variable name in string: # variable name # break # continue # index = 0 # while index

< len(test): # v = test[index] # print(v) # # index += 1 # print('=======') # for zjw in test: # print(zjw) # test = "郑建文妹子有种冲我来" # for item in test: # print(item) # break # for item in test: # continue # print(item)# 二、索引，下标，获取字符串中的某一个字符 # v = test[3] # print(v)# 三、切片 # v = test[0:-1] # 0=< 20: name = name[0:20] pwd = input('请输入密码：') if len(pwd) >

Pwd = pwd [0:20] mails = input ('Please enter email address') if len (mails) > 20: mails = mails [0:20] n = m.format (name,pwd,mails) s = s + nv = s.expandtabs (30) print (v)

As shown in the following set of values [11, 22, 33, 44, 55, 66, 77, 88, 99, 90...], save all values greater than 66 to the first key of the dictionary, and save values less than 66 to the value of the second key.

That is: {'K1values: all values greater than 66,' K2values: all values less than 66}

Li = [11, 22, 33, 34, 55, 6, 6, 7, 77, 88, 99, 90] N1 = [] N2 = [] n3 = {} for i in li: if I > 66: n1.append (I) if I < 66: n2.append (I) # print (N1 MagneN2) n3.setdefault ('K1LINGLERING N1) n3.setdefault (' K2LINGRIMEN N2) print (N3)

8. Multiplication table

For i in range (1 str 10): s =''for n in range (1): s + = str (n) +' *'+ str (I) +'='+ str (ninji) +'\ t 'print (s)

9. Pagination display content

L = [] for i in range (1302): tmpe = ['name'+str (I),' age'+str (I)] l.append (tmpe) while True: s = input ('Please enter page number:') if s.isdigit () = 0: print ('incorrect input! Please enter the decimal number') continue s = int (s) start = (s-1) * 10 end = s * 10l1 = l [start:end] for i in L1: print (I) above are all the contents of the article "what are the basic data types of Python". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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