Python error: ValueError: invalid literal for int() with base 10: 'xxx', how to solve it?

Python error: ValueError: invalid literal for int() with base 10: 'xxx', how to solve it?

In the process of using Python for programming development, we often encounter various error messages. Among them, a common error is "ValueError: invalid literal for int() with base 10: 'xxx'". This error usually occurs when passing a string that cannot be converted to an integer to the int() function.

The error message means: An error occurred when passing the string to the int() function because the string cannot be parsed as a valid integer. Possible reasons are that the string contains non-numeric characters, or the string is empty.

Let’s look at a code example to reproduce this error:

number = input("请输入一个整数：")
result = int(number)
print(result)

In this code, we use the input() function to receive the string entered by the user and try to convert it For integer type. If the string entered by the user cannot be converted to an integer, an "Invalid literal for int() with base 10" error will be triggered.

In order to solve this problem, we can perform some error handling operations. Here are several common solutions:

1. Use try-except statement for exception handling

number = input("请输入一个整数：")
try:
    result = int(number)
    print(result)
except ValueError:
    print("输入的字符串无法转换为整数，请重新输入！")

In this example, we use try-except statement to catch ValueError exception . If the string entered by the user cannot be converted to an integer, an exception will be triggered, and then the program will jump to the except block to execute the corresponding error handling code.

2. Check using isdigit() method

number = input("请输入一个整数：")
if number.isdigit():
    result = int(number)
    print(result)
else:
    print("输入的字符串无法转换为整数，请重新输入！")

In this example, we use isdigit() method to check whether the input string contains only numeric characters. If the string contains no non-numeric characters, it can be safely converted to an integer; otherwise, an error message will be output.

In addition to these two methods, some other processing can also be performed according to specific business needs. For example, if the input string is empty, you can prompt the user to re-enter; if you need to retain non-numeric characters in the input string, you can use regular expressions to extract valid numeric characters, etc.

To summarize, when we encounter the "ValueError: invalid literal for int() with base 10: 'xxx'" error during Python programming, we should first check whether the input string satisfies its Conversion to integer requirements. Then, choose the appropriate processing method based on business needs, such as using the try-except statement for exception handling or using the isdigit() method to check the content of the string. Through these methods, we can better solve this error and improve the robustness of the program.

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