Example demonstration: practical application scenarios of int() function in Python

The int() function in Python is a built-in function used to convert a string or number into an integer. In programming, we often encounter situations where we need to convert strings or other types of data into integers. This article will use specific code examples to demonstrate the usage of the int() function in actual application scenarios.

Scenario 1: Processing of user input

In many cases, we need the user to input an integer, and we want to convert the user input into an integer for processing. The following is a sample code:

user_input = input("请输入一个整数：")
try:
    num = int(user_input)
    print("您输入的整数是：", num)
except ValueError:
    print("输入的内容不是整数，请重新输入！")

In this code sample, the user input is first received through the input() function, and then the int() function is used to Convert user input to an integer. If the content entered by the user cannot be converted to an integer, the ValueError exception will be caught and the user will be reminded to re-enter.

Scenario 2: Convert string to integer

Sometimes we need to convert a string representing a number into an integer in order to perform numerical calculations. Here is a sample code:

num_str = "12345"
num_int = int(num_str)
print("转换后的整数为：", num_int)

In this example, we convert the string num_str to an integer num_int, and then output the converted integer value.

Scenario 3: Processing of file read data

When processing file data, sometimes we need to convert the read data into integers for further processing. The following is a sample code:

with open("data.txt", "r") as file:
    data = file.read()
    numbers = data.split(",")
    int_numbers = [int(num) for num in numbers]
    print("读取并转换的整数数据为：", int_numbers)

In this example, we first read the data in the file, and then split the data according to specific delimiters to obtain a string list numbers. Then use list comprehensions and the int() function to convert the string list into an integer list int_numbers, and finally output the converted integer data.

Through the above example demonstration, we can see the flexible application of the int() function in various practical scenarios. Whether it is user input processing, string conversion or file data processing, the int() function is a very convenient and practical tool that can help us quickly and accurately convert data into integer types and implement code logic. perfect and accurate.

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