Python conditional loop judgment

1. Conditional Judgment Statement

The keywords for conditional selection statements in Python are: If, elif, else three. Its basic form is as follows:

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age_of_cc =27age =int(input("guessage:"))ifage ==age_of_cc:    print("Yes,you got it!")elifage > age_of_cc:    print("猜大啦！")else:    print("猜小啦！")

If statement execution is characterized by judging from the top down;

Where the elif and else statement blocks are optional. The branch statement executes only if and elif are judged true, and the Else branch is executed only if and all of the elif's judgments are false. Note in the conditional selection statement in Python, there is a colon behind the judgment.

2. Looping statements2.1 While Loop

Usage:

12	while条件:    xxxxxx

The while loop executes the statement that is subordinate to it until the condition is False (false)

2.1.1 Break Skip Loop

code example:

AGE_OF_CC = 27count =0while Count < 3: Age    = Int (Input ("Guessage:"))    if age = = age_of_cc:        print ("Yes,you go T it! ")        Break    Elif Age > AGE_OF_CC:        print ("Big guess!")    Else:        print ("Guess small!") ")    count + = 1else:    if Count = = 3:        print (" error too many times! ") ")

2.1.2 Continue skip the cycle

code example:

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i =1whilei < 10:    i +=1    ifi%2> 0:     # 非双数时跳过输出        continue    print(i)      # 输出双数2、4、6、8、10

　　

2.2 for Loop

The For loop requires a pre-set number of cycles (n), and then executes the statement that is subordinate to the for (n) times.

code example:

12	fori inrange(10):    print(i) #输出0 1 2 3 4 5 6 7 8 9

The while Loop Judgment statement code example:

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age_of_cc =27count =0whilecount < 3:    age =int(input("guessage:"))    ifage ==age_of_cc:        print("Yes,you got it!")        break    elifage > age_of_cc:        print("猜大啦！")    else:        print("猜小啦！")    count +=1else:    ifcount ==3:        print("错误太多次啦！")

For condition Judgment code example:

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age_of_cc =27count =0fori inrange(3):    age = int(input("guessage:"))    ifage ==age_of_cc:        print("Yes,you got it!")        break    elifage > age_of_cc:        print("猜大啦！")    else:        print("猜小啦！")    count +=1else:    ifcount ==3:        print("错误太多次啦！")

  3.1 Input

Input is a function in which the user can enter a string to be saved into a variable

code example:

1	name =input("Please input your name")

3.2 Print

Using print () to add a string to the parentheses, you can output the specified text to the screen

code example:

1	print("Hello！")

3.3 Type Conversions

As you can see above, input inputs are considered to be strings (see) in Python, so we need to type-convert the contents of input:

Convert to int example:

1	age =int(input("age is:"))

Convert back string: str ()

Python conditional loop judgment