What knowledge does Python need to learn?

1. The first line of python code:

1 name = "你好，世界"2 print(name)

2. Variables:

1 name = "SunDM12"2 name2 = name3 print("my name : ",name, name2)4 5 name = "wangba"6 print(name, name2)

name changes before and after, and name2 = name has changed Assign "SunDM12" to name2. After name changes, name2 will no longer change

3. Interaction:

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

Input function: The user can display input on the interface characters and assigned to username

 1 name = input("name :") 2 age = input("age :") 3 job = input("job :") 4 salary = input("salary :") 5  6 info = ''' 7 ------ info of %s ------ 8 name : %s 9 age : %s10 job : %s11 salary : %s12 '''%(name, name, age, job, salary)

in the first format printed on the screen.

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

1 info2 = '''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 for printing on the screen.

1 info3 = '''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 for screen printing.

4. Login password:

 1 import getpass 2  3 _username = 'SunDM12' 4 _password = '123456' 5  6 username = input('username :') 7 password = input('password :') 8 print(username,password) 9 10 if _username == username and _password == password11     print("welcome user {name} login...".format(name = username))12 else:13     print("Invalid username or password!")

getpass is a package that provides portable mask input

1. getpass.getpass()

2. getpass.getuser()

5. Password guessing game

1 correct_number = 122 guess_number = int(input("guess number:"))3 4 if correct_number == guess_number:5     print("yes,you got it...")6 elif guess_number >correct_number:7     print("think smaller...")8 else:9     print("think bigeer...")

where input The function input is a character, which needs to be forced to an integer type

5.1 while loop

1 count = 02 while True:3     print("count :",count)4     count = count +15     if count == 1000:6         break

break means to jump out of the entire loop

correct_number = 12count = 0while count<3:
    guess_number = int(input("guess number:"))if correct_number == guess_number:print("yes,you got it...")elif guess_number >correct_number:print("think smaller...")else:print("think bigeer...")
    count + = 1else:print("you have tried too many times.")

Use while loop to design number guessing game

5.2 for loop

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

Display 1 to 10

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

2 is the step length

correct_number = 12for i in range(3):
    guess_number = int(input("guess number:"))if correct_number == guess_number:print("yes,you got it...")elif guess_number >correct_number:print("think smaller...")else:print("think bigeer...")else:print("you have tried too many times.")

Use for loop to guess the number game

5.3 The difference between continue and break

 1 for i in range(10): 2     if i<5: 3         print("loop",i) 4     else: 5         continue 6     print("....") 7  8 for i in range(10): 9     print(&#39;-------&#39;,i)10     for j in range(10):11         print(j)12         if j>5:13             break

continue ignores the current statement and continues to execute the next line

break jumps out of the entire currently executed loop

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