问题:

I know I can get Python to ignore PYTHONPATH if I start it with the -E flag.

But how do I get a script installed by pip to have this flag?

I tried both the "scripts" and the "console_scripts" section of the code and pip strips the -E if I put it on the #! line.

回答1:

I generally recommend against this sort of trickery. The target system puts paths in place for a reason. If you want to break out of a virtualenv you should simply recommend not installing in a virtualenv in your documentation.

However you can remove the entry from sys.path.

import sys
import os

sys.path = [p for p in sys.path if p not in [os.path.abspath(x) for x in os.environ['PYTHONPATH'].split(':')]]

回答2:

The easiest way right now seems to be to put write a scripts that restarts Python if the flag is not included:

#!/bin/env python
import sys
if not sys.flags.ignore_environment:
      import os
      os.execv(sys.executable, [sys.executable, '-E'] + sys.argv)
# Run your actual script here

Then in setup.py, put this: