Python: Best way to add to sys.path relative to the current running script

Question

This is what I use:

import os, sys
sys.path.append(os.path.join(os.path.dirname(__file__), "lib"))

I'm using:

import sys,os
sys.path.append(os.getcwd())

If you don't want to edit each file

• Install you library like a normal python libray
  or
• Set PYTHONPATH to your lib

or if you are willing to add a single line to each file, add a import statement at top e.g.

import import_my_lib

keep import_my_lib.py in bin and import_my_lib can correctly set the python path to whatever lib you want

Create a wrapper module project/bin/lib, which contains this:

import sys, os

sys.path.insert(0, os.path.join(
    os.path.dirname(os.path.dirname(os.path.realpath(__file__))), 'lib'))

import mylib

del sys.path[0], sys, os

Then you can replace all the cruft at the top of your scripts with:

#!/usr/bin/python
from lib import mylib

Using python 3.4+

import sys
from pathlib import Path

# As PosixPath
sys.path.append(Path(__file__).parent / "lib")

# Or as str as explained in https://stackoverflow.com/a/32701221/11043825
sys.path.append(str(Path(__file__).parent / "lib"))