The first day of Python learning

First, the Python line of code:

1 " Hello, World " 2 Print (name)

Second, variable:

1 " SunDM12 " 2 name2 = name3print("", Name, name2) 4 5 " Wangba " 6 Print (Name, name2)

Name changes, and name2 = name has assigned "SunDM12" to name2,name changes, name2 no longer changes

Third, Interaction:

1 username = input ("")2print(username)

Input function: The user can display characters on the interface and assign values to the username

1Name = input ("Name:")2Age = Input ("Age :")3Job = input ("Job:")4Salary = input ("Salary:")5 6info =" "7 ------Info of%s------8 Name:%s9 Age :%sTen Job:%s One Salary:%s A " "% (name, name, age, job, salary)

The first format that is printed on the screen.

%s is a string;%d is double;%f is a floating-point type

1 " " 2 -------info of {_name}------- 3 name: {_name} 4 Age : {_age} 5 job: {_job} 6 salary: {_salary} 7 ". Format (_name=name,8                _name=name,_age=age,_job=job,_salary=salary)        

The second format is printed on the screen.

1 " " 2 ------Info of {0}------ 3 name: {0} 4 Age : {1} 5 job: {2} 6 Salary: {3} 7 ". Format (name,age,job,salary)

The third format is printed on the screen.

Four, login password:

1 ImportGetpass2 3_username ='SunDM12'4_password ='123456'5 6Username = input ('Username:')7Password = input ('Password:')8 Print(Username,password)9 Ten if_username = = Username and_password = =Password One     Print("Welcome User {Name} login ...". Format (name =username)) A Else: -     Print("Invalid username or password!")

Where Getpass is a package with portable mask input

1. Getpass.getpass ()

2. Getpass.getuser ()

Five, guess the password game

1Correct_number = 122guess_number = Int (input ("Guess number:"))3 4 ifCorrect_number = =Guess_number:5     Print("yes,you got it ...")6 elifGuess_number >Correct_number:7     Print("think smaller ...")8 Else:9     Print("Think Bigeer ...")

Where the input function is entered as a character, at which point it is cast to an integral type

5.1 While loop

1 count = 02 while True:3     print("  Count:", Count)4     count = Count +15     if count = = +:6          break

Where break means jumping out of the loop

Correct_number = 12Count=0 whileCount<3: Guess_number= Int (Input ("Guess number:"))    ifCorrect_number = =Guess_number:Print("yes,you got it ...")    elifGuess_number >Correct_number:Print("think smaller ...")    Else:        Print("Think Bigeer ...") Count+ = 1Else:    Print("You have tried too many times.")

Using while loop to design guessing number games

5.2 For Loop

1  for  in range:2     print("", i)

Displaying 1 to 10

1  for  in range (0,10,2):2     print("loop:" , I)

2 is the step size

Correct_number = 12 forIinchRange (3): Guess_number= Int (Input ("Guess number:"))    ifCorrect_number = =Guess_number:Print("yes,you got it ...")    elifGuess_number >Correct_number:Print("think smaller ...")    Else:        Print("Think Bigeer ...")Else:    Print("You have tried too many times.")

Guessing a number game with a for loop

The difference between 5.3 continue and break

1  forIinchRange (10):2     ifI<5:3         Print("Loop", i)4     Else:5         Continue6     Print("....")7 8  forIinchRange (10):9     Print('-------', i)Ten      forJinchRange (10): One         Print(j) A         ifJ>5: -              Break

Continue ignores the current statement and proceeds to the next line

Break jumps out of the current execution of the entire loop

The first day of Python learning