To obtain the filename of the script in the file system, use the following Python code:
__file__
You can check the output by creating a Python script (a file with a .py extension) with the following content:
print(__file__)
and check what it outputs.
Note: The variable __file__ does not exist when you are in REPL (Read-Eval-Print Loop). This makes sense, as there is no script file.
To obtain the directory of this file, you can use the following code:
import os
print(os.path.dirname(__file__))
Often your path might contain some non-normalized path, such as symbolic links. You can normalize the path using the following code:
import os
print(os.path.dirname(os.path.realpath(__file__)))
This is very useful if you call your script with something like python ../scripts/halting-problem.py.
In that case, you might get an output such as /home/aturing/Videos/../scripts.
By using realpath as shown above, you will get the canonical (or normalized) path, such as /home/aturing/scripts.