从其他位置运行时如何在linux上获取绝对路径

Question

I want to run a crontab which will run my file every hour at 0 minutes. I have the (sudo) crontab set up with a single command as follows:

0 * * * * /usr/bin/python3 /usr/folder/test.py

The crontab is running and as far as I can tell is correct, but my python file is not returning the absolute path when the file is run from another location.

What I need is a way to guarantee the absolute path of this text file when it is accessed from the root so that my crontab can run the file.

I've tried using both Path(filename).resolve() , and os.path.abspath(filename) but neither of them work.

import os
print(os.path.abspath("checklist.txt"))

python3 usr/folder/test.py

When I run the file "test.py" while within the folder, I get the expected output

python3 test.py

/usr/folder/checklist.txt

however when I run the same file from the root and access it via a path I get a different result, making using crontab impossible in this context

python3 usr/folder/test.py

/checklist.txt

Answer 1

If checklist.txt is in the same folder as your test.py script, then you can use the __file__ variable to get the right path. For example

# The directory that 'test.py' is stored
directory = os.path.dirname(os.path.abspath(__file__))
# The path to the 'checklist.txt'
checklist_path = os.path.join(directory, 'checklist.txt')

Answer 2

__file__ attribute

import os
filename = 'checklist.txt'
abs_path_to_file = os.path.join(os.path.dirname(__file__), filename)

---

sys module

import os, sys
filename = 'checklist.txt'
abs_path_to_file = os.path.join(os.path.dirname(sys.argv[0]), filename)