Tell if Python is in interactive mode

Question

In a Python script, is there any way to tell if the interpreter is in interactive mode? This would be useful so that, for instance, when you run an interactive Python sessio

Answer 1

__main__.__file__ doesn't exist in the interactive interpreter:

import __main__ as main
print hasattr(main, '__file__')

This also goes for code run via python -c, but not python -m.