Python error: ValueError: invalid literal for int() with base 10: 'xxx', what is the solution?

Python error: ValueError: invalid literal for int() with base 10: 'xxx', what is the solution?

In Python programming, we often encounter various error messages. Among them, ValueError is a common error type. When we try to convert an invalid character to an integer, the ValueError error will be triggered. A common situation is that when using the int() function to convert a string, the string contains non-numeric characters or invalid numeric characters.

For example, when we run the following code:

num = int('xxx')

The ValueError: invalid literal for int() with base 10: 'xxx' error message will appear.

So, how to solve this error? Below I will introduce a few common solutions.

Method 1: Check whether the string contains non-numeric characters

First, we need to check whether the converted string contains non-numeric characters. Converting a string to an integer can only be successful if it consists entirely of numeric characters. We can use the isdigit() method to determine whether a string contains only numeric characters.

num_str = 'xxx'
if num_str.isdigit():
    num = int(num_str)
else:
    print("字符串中含有非数字字符")

Method 2: Use try-except statement to catch exceptions

Another solution is to use try-except statement to catch exceptions. We can use try statement while converting string using int() function and handle ValueError exception in except block.

num_str = 'xxx'
try:
    num = int(num_str)
except ValueError:
    print("字符串无法转换为整数")

Method 3: Use regular expressions to filter non-numeric characters

Using regular expressions can easily filter non-numeric characters. We can use the sub() function in the re module, combined with regular expressions, to replace non-numeric characters in a string with an empty string.

import re

num_str = 'xxx'
num_str = re.sub(r'D', '', num_str)
num = int(num_str)

The above are several common solutions. By avoiding non-numeric characters, using exception handling, or using regular expressions to filter non-numeric characters, we can successfully solve ValueError: invalid literal for int() with base 10: 'xxx' error.

I hope this article can help you understand and solve this error!

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