Feature Request: Keep REPL open after error in script execution

[sohang3112]

When running ptpython -i file.py, if an error occurs, ptpython currently prints the error and exits. This differs from the behaviour of python -i file.py, which prints the traceback and then opens the REPL, preserving the variables of file.py up to the point where the error occurred.

This would be especially useful because I can fix whatever error occurred, then manually continue execution using the script variables (which could be loaded from slow functions like API requests).

Note: I'm using ptpython version 3.0.23

[sohang3112]

ipython -i file.py also does this correctly - it opens its REPL if the script execution fails.