FileNotFoundError: How to resolve Python file not found error?

In the Python programming process, a common error is "FileNotFoundError", which is the error that the file is not found. This error usually occurs when you try to read or write a file that does not exist. This error message will appear in the terminal window or Python interactive environment.

This question may confuse beginners. So, this article will introduce some methods to solve this problem and help you find and solve this error.

1. Check whether the file path is correct

The most basic way to solve this problem is to check whether the file path is correct. If you are opening or creating the file through code, you can check that the path you provided is correct. You can check if the path is correct by printing the path in your code.

Under Windows operating system, the path should use double slash "\" or single slash "/", while under Linux or MacOS operating system, single slash "/" should be used, otherwise it will cause " FileNotFoundError" error.

2. Confirm that the file name is spelled correctly

If the path is correct but it still cannot find the file, then it is most likely because the file name is spelled incorrectly. Make sure the file name and extension are correct to avoid this error.

To avoid spelling errors like this, you can use copy and paste to avoid typing errors when handwriting file names. In addition, you can also use the autocomplete function in your IDE or text editor to help you enter the correct file name.

3. Use Absolute Paths

You can use absolute paths to avoid "FileNotFoundError" errors when opening or creating files. Relative paths are usually relative to the current working directory, and as the working directory changes, relative paths often cause problems. The absolute path determines the exact location of the file and will not be affected by the working directory.

You can use the getcwd() function in the os module to obtain the current working directory. In addition, the os.path.abspath(path) function can also convert a relative path into an absolute path

4. Confirm whether the file exists

If you do not confirm whether a file exists, then "FileNotFoundError" will occur when trying to open or write to the file. You can use the os module in Python to check whether a file exists.

Use the os.path.isfile(filename) function to check whether a file exists. Returns True if the file exists, False otherwise. The sample code is as follows:

import os

file_path = "example.txt"

if os.path.isfile(file_path):
    with open(file_path) as f:
        # 处理文件内容
else:
    print("文件%s不存在" % file_path)

5. Check file permissions

In some cases, there may be insufficient file permissions that prevent the file from being accessed or modified. If you are using a Linux or MacOS operating system, you can use the chmod command to change file permissions.

For example, if you want to open an inaccessible file using Python, you can run the following command: chmod r example.txt, which will give the example.txt file read permissions.

6. Confirm that the file type is correct

Pay attention to the file name suffix to ensure you are opening or writing the correct file type. A Python script that attempts to read a PDF file should report an error, but if you accidentally name the file extension .doc instead of .pdf, a "FileNotFoundError" error will be triggered.

When you encounter a "FileNotFoundError" error, you must carefully check factors such as whether the file path is correct, whether the file name is correct, whether the file type is correct, and whether the file exists. Through these methods, you can quickly find the problem and solve this "FileNotFoundError" error.

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