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This article mainly shows you the "user input and while loop in Python how to use", the content is easy to understand, clear, hope to help you solve doubts, the following let Xiaobian lead you to study and learn "user input and while loop in Python how to use" this article.

I. user input

Input ()-the function input () temporarily stops the program and waits for the user's input. After getting the user's input, Python stores the input in a variable for later use.

1. Input string

Let's start with a simple example of user input.

Msg = input ('Please input a string:') # the content in the quotation marks should indicate what kind of information the user needs to provide. # if the prompt in the quotation marks has multiple lines, you can add'\ n'to wrap the line print ('The message you just input is "' + msg +'.')

The running result is shown in the following figure:

After the program runs, "Please input a string:" prompts the user to enter a string. After entering the string, the user presses the enter key to continue the program. The string entered by the user is stored in the variable msg, and the user input can be seen by printing msg.

two。 Use the function int () to get numeric input

Sometimes we need the user to enter a numeric value, but when using the function input (), Python interprets all the user input as a string, even if you enter a numeric value, you need to use the function int ().

Int ()-- the function int () converts the input numeric string to a numeric value.

User input processed by the function int () can be used as a numeric value.

The following is an example of using the function int () to get numeric input.

Age = input ('Please input your age:') age_integer = int (age) # converts a numeric string to a numeric value if age_integer > = 18: print ('Your age is over 18.') else: print (' Your age is under 18.')

The running result is shown in the following figure:

3. Application of Modulus operator

The modular operator% is often used in programming. it is used to return the remainder of the division of two numbers. If the remainder is 0, it can be divisible. By modulating the number entered by the user with 2, you can determine whether the number entered by the user is odd or even.

The following is an example of using a modular operation to determine whether the input is odd or even

Num = input ('Please input a number:') number = int (num) print ('The number you just input is' + num +'.) if number%2 = 0: # divisible by 2, even print ('It is an even number.') else: # not divisible by 2, odd print ('It is an odd number.')

The running result is shown in the following figure:

2. While cycle

The for loop, which is generally used for every element in the collection, has been introduced before, and the while loop runs until the specified condition is not met.

1. Simple while loop

Here is an example of a simple while loop:

Num = 1while num

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