day2--list/tuple/string/dictionary

1. List

#!/usr/bin/env python#-*-coding:utf-8-*-#AUTHOR:DCC#Listnames = ["a","b","C","D","e"]Print(names)Print(Names[0])Print(Names[1:3])#slicesPrint(names[1:])Print(Names[:3])Print(names[-2:]) Names.append ("F")#AppendPrint(names) Names.insert (2,"A")#InsertPrint(names) names[5] ="D"  #ModifyPrint(names) Names.remove ("D")#DeletePrint(names)delNAMES[2]#DeletePrint(names) Names.pop ()#The default is to delete the last one, in parentheses you can enter the coordinates to delete, Names.pop (2) with Del names (2)Print(names)Print(Names.index ("C"))#find where an element is locatedNames.reverse ()#reversalPrint(names) Names.sort ()#SortPrint(names) name2= ["a","b","C","D","e"]names.extend (name2)#splicing and connecting a listPrint(names,name2)Print(Names.count ("a"))#number of statistics aname2.clear ()#Clear ListPrint(name2)delName2#Delete ListPrint(name2) name1= Names.copy ()#CopyPrint(names)Print(name1) names[1] ="B" #Modify a single elementPrint(names)

2. String

#!/usr/bin/env python#-*-coding:utf-8-*-#AUTHOR:DCCname="\TABCDE AAA"Print(Name.capitalize ())#Capitalize first letterPrint(Name.count ("a"))#number of occurrences of statisticsPrint(Name.center (30,'-'))#Supplemental FormatPrint(Name.endswith ("a"))#determine what the string ends withPrint(Name.expandtabs (tabsize=10))#Convert the Tab key to how many spaces. Print(Name.find ("C"))#find the index where the character is located#name = "ABCDE {name} AAA {year}"#Print (Name.format (name= "Alex", Year= ")")Print("abc123". Isalnum ())#determine if it is an Arabic characterPrint("123". IsDigit ())#determines whether an integerPrint("A123". Isidentifier ())#determine if the variable name is validPrint("123". IsNumeric ())#determine if a pure number is similar to IsDigitPrint("My Name is". Istitle ())#Capitalize all initialsPrint("ABC". Isupper ())#are all uppercase. Print(",". Join (["1","2","3"]))#Change a list to a stringPrint(Name.ljust (50,"*"))Print(Name.rjust (50,"*"))#left and right complement allPrint("AAA". Lower ())#Uppercase Edge LowercasePrint("AAA". Upper ())#lowercase gets bigger .Print("\nname". Lstrip ())#go to the left, enter.Print("name\n". Lstrip ())#go to the right, enter.Print("name\n". Strip ())#go to all the carriage returns/spacesP= Str.maketrans ("abcdef","123456")#one by one corresponding Replacement/translationPrint("Alex Li". Translate (p))Print("Alex a A". replace ("a","A", 2))#Replace replacement, control numberPrint("Aebcdef". RFind ("e"))#Find it from the right and find the one on the right.Print("Alex Li Aa". Split ())#To convert a string to a list, you can customize the delimiterPrint("al\nex\nli\n". Splitlines ())#Split by change behavior, to listPrint("Alex Li". Swapcase ())#Case- insensitive

3. Dictionaries

#!/usr/bin/env python#-*-coding:utf-8-*-#AUTHOR:DCC#Key-value" "info = {"A": "A", "B": "B", "C": "C", "E": "E"}print (info) print (info["a"]) #通过key找valueinfo ["a"] = "AA" #修改val Ueprint (info["a"]) info["f"] = "F" #如果存在, modify, do not exist add print (info) #del info["C"] #删除 #info.pop ("C") #删除 #info.popitem () # Random Delete info["a"] #获取value, if not, will error, generally do not. Print (Info.get ("a")) #最安全的获取valueprint ("a" in info) #查找字典中是否有. Print (Info.values ()) #打印所有的valueinfo. SetDefault ("3": "1") #有的话, unchanged, no words added. Info.update (b) #将b更新到 info, the info is overwritten and no print (Info.items ()) #将字典转为列表 is added. c = Dict.fromkeys ([6,7,8], "test") #初始化一个字典print (c)" "#the cycle of the dictionary. Info1= {    "a":"A",    "b":"B",    "C":"C",    "e":"E"} forIinchINFO1:#The best way    Print(i)Print(I,info1[i])##For k,v in Info1.items (): #会先把dict转成list, the data is not used in large#print (k,v)

day2--list/tuple/string/dictionary