Test case for runpy

foo.py

from __future__ import print_function

class App(object):
    def __init__(self, a='', b=0, c=False):
        print("  ", a, b, c)

class Foo(App):
    def __init__(self):
        super(Foo, self).__init__(a='bar', b=80, c=True)

test_foo.py

from __future__ import print_function

import importlib
import inspect
import sys

print("loading as module...")

mod = importlib.import_module('foo')
for _, cls in inspect.getmembers(mod, inspect.isclass):
    if issubclass(cls, object) and cls.__module__ == 'foo':
        print("  ", cls, cls())

try:
    import runpy

    print("loading as path via runpy...")

    globals = runpy.run_path('foo.py')
    for _, obj in globals.items():
        if inspect.isclass(obj) and issubclass(obj, object) and obj.__module__ == '<run_path>':
            print("  ", obj, obj())
except Exception as e:
    import imp
    import os.path

    print("failed loading via runpy:", e)
    print("loading as path via imp...")

    module = os.path.splitext('foo.py')[0]
    mod = imp.load_source(module, 'foo.py')
    for name in mod.__dict__:
        obj = getattr(mod, name)
        if inspect.isclass(obj) and issubclass(obj, object) and obj.__module__ == module:
            print("  ", obj, obj())

test_foo.txt

# Python 2.7 (python test_foo.py)

loading as module...
    0 False
   <class 'foo.App'> <foo.App object at 0x102b63e50>
   bar 80 True
   <class 'foo.Foo'> <foo.Foo object at 0x102b63e50>
loading as path via runpy...
    0 False
   <class '<run_path>.App'> <<run_path>.App object at 0x102b72f50>
failed loading via runpy: super() argument 1 must be type, not None
loading as path via imp...
    0 False
   <class 'foo.App'> <foo.App object at 0x102b72ed0>
   bar 80 True
   <class 'foo.Foo'> <foo.Foo object at 0x102b72ed0>

# Python 3.6 (python test_foo.py)

loading as module...
    0 False
   <class 'foo.App'> <foo.App object at 0x10b51ff98>
   bar 80 True
   <class 'foo.Foo'> <foo.Foo object at 0x10b51ff98>
loading as path via runpy...
    0 False
   <class '<run_path>.App'> <<run_path>.App object at 0x10b5a9cc0>
   bar 80 True
   <class '<run_path>.Foo'> <<run_path>.Foo object at 0x10b5a9cc0>