Basic Lesson01 of the Python introductory course

2. The difference between print 2.7 and 3.0 is  2.0  ===> print "Hello World"  3.0 ===>  print ("Hello World")
   
   

    1print("helloWorld")

4. Variable assignment  temporarily stores data

   '  - '  =print(name,age)

6. Input values are stored with variables.
   
   

   #                       3.0 input is input ("Please input your text")#                      2.X version there is raw_input ("Please input your text")  #                      2.7 in Input  () in parentheses what type of output will be given, and then the egg, 3.0 removed #                      3.0 If you want to use input ()  eq:eval (Input ("yous text") in 2.7)= input ("Please Your Nick name")print(name)

7. If ... else ...  Indent eq:  int (var): turn var to int

   lucknum = Int (input ("Please input your luck number"))         ifLucknum = = 1:            Print("I want say no")         elifLucknum > 10:            Print("no come on baby")         Else:             Print("finally say yes")

8. While loop

   Inputnum =0bingoNum= 13Count=0 whileCount < 3: Inputnum= Int (Input ("Please input yours num:")) Count= Count+1if(Count ==3):        Print("try too many")         Break    if(Inputnum >bingonum):Print("input number is bigger!")    elif(inputnum<bingonum):Print("input number is small!")    elif(Inputnum = = 13):        Print("Congratulation")     Break

9. string concatenation   %s table placeholder   %s ... Assignment% (val ...) Company = input ("conpany:")

   Company = input ("Conpany:") Companynum= Input ("Number :")Print("info:\n Company"+company+"\nnumber"+companynum)#the "+" stitching string requires a separate memory for each additionPrint("info{} \ n Company:%s \ n Number:%s"% (company, Companynum))#no separate space to save memory

10. String method

    TestString ="Testsss1"Print(Teststring.lower ())#Change LowercasePrint(Teststring.upper ())#Change CapitalizationPrint(Teststring.split ("g"))#use "G" to splitPrint(Teststring.count ("s"))#Count the number of "s"Print(Teststring.replace ("1","2"))

11. Use of list lists

    NameList = ['Jerry','Tom','Jeck','Alice']Print(NameList)Print(Namelist[1])#Take valueNamelist.append ("Jerry")Print(NameList)#trailing Add dataPrint(Namelist.index ("Jerry"))#find Jerry's index valuePrint(Namelist.count ("Jerry"))#The statistics list contains the count of the stringnamelist.insert (0,"Lulu")#inserting data based on an indexPrint(NameList) namelist.sort ()Print(NameList)#Sort by askii code.Namelist.reverse ()#Reverse FlashbackPrint(NameList)Print(Len (NameList))#len (list) Gets the list lengthPrint(dir (list))#See what methods are available for list

12. List Advanced

    NameList = [1,2,4,'OK','Yes']Print(Namelist[0:2])#The result is "0" and 2 for the index.Print(Namelist[0:2:2])#That means you can cut from 0~2 2.Print(Namelist[-3])#take the back and take it backwards.Print(namelist[-2:])#like taking out OK and yesPrint(Range (10))#Range (0, ten)Print(Type (range (10)))#results <class ' range ' >if4inchNameList:Print("Is true")#Determines whether the list contains a value

14. Meta-group

    # Yuanzu = (1,3,4,5,5,6,)  two methods  count and index  list and tuple can be converted  to each other = (1,3,4,5,5,6,) list ( Yuanzu) type (yuanzu)    # result is listtuple (yuanzu) type (yuanzu)    #  The result is a tuple

16.  operator 

     #   1.  * * Power 2**3 2 three-time square  #   2.  Divisible 1//2 =0 2//2=0 2.X  #   3.   2.X <> Not equal to 3.X remove  #   4. and Java and meaning  Or or not non-true  #   5.Is and IsNot type (list) is List Result true  

     

18. Continue jump out of this cycle and continue to the next cycle

     for  in range:     if i > 3:         continue     print  1 2 3

    This article is only for learning reference, if there is no wrong please correct me, I am still a pupil, need to learn a lot of things, if reproduced please indicate the source

Basic Lesson01 of the Python introductory course