Get input from the user using Python's input() function

Title: Using Python's input() function to obtain input from the user

When writing a program, you often need to obtain input from the user. Python provides a built-in function input() that can be used to obtain and receive user input. This article will introduce how to use the input() function and some common application scenarios.

The input() function is very simple to use. It accepts an optional prompt information as a parameter and waits for user input. After the user inputs, the input() function will return a string type value, which is the user's input. The following is a simple example:

name = input("请输入你的姓名：")
print("你好，" + name + "！欢迎来到Python世界！")

In the above example, the program first displays a prompt message through the input() function, asking the user to enter a name. Then, the program saves the name entered by the user in the name variable and prints a greeting message to the user through the print() function. In this way, the user interacts with the program.

In addition to displaying prompt information, you can also obtain the number entered by the user through the input() function. When obtaining numeric input, the return value needs to be converted to the corresponding numeric type. The following is an example:

age = int(input("请输入你的年龄："))
year = 2022 - age
print("你出生于" + str(year) + "年。")

In the above example, the input() function will return a user input of string type, and then use the int() function to convert the string to an integer type and save it in the age variable middle. The program calculates the current year minus the age entered by the user to obtain the user's birth year and prints it. It should be noted that when converting a string to an integer, make sure that the user input is something that can be converted to an integer.

In addition to single-line input, the input() function can also be used for multi-line input. When inputting multiple lines, the user can enter multiple lines of text through the line feed key until the user completes the input. The following is an example:

print("请输入一个多行文本：")
text = ""
while True:
    line = input()
    if line == "":
        break
    text += line + "
"

print("你输入的文本是：")
print(text)

In the above example, the program continuously obtains each line of text entered by the user through a while loop. When the user enters a blank line, the loop exits. The text entered by the user is saved line by line in a string variable text, and finally printed out through the print() function. This allows users to enter multiple lines of text and interact with the program.

In addition to the common application scenarios in the above examples, the input() function can also be combined with other functions and structures to be used in more complex program logic. Through the input() function, we can perform corresponding operations based on user input to achieve personalized functions. At the same time, we also need to pay attention to verifying and processing user input to ensure the stability and security of the program.

To summarize, it is very simple to use Python’s input() function to get input from the user. Through this function, we can interact with the user and perform corresponding processing based on the user's input. Whether you are getting a single line of text, numeric input, or even multiple lines of text, you can do it through the input() function. I hope the examples in this article can help readers better understand and use the input() function and improve their programming skills.

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