Question

I have a module named module.py, which checks a global variable in context.

module.py:
----------

if 'FOO' in globals():
    print 'FOO in globals'
else:
    print 'nah'


in python shell:
----------------

In [1]: FOO = True

In [2]: import module
nah

how can I import modules with existing context?

Answer 1

This is rather hackish — don’t rely on this for production code since not all implementations of Python have a inspect.getouterframes function. However, this works in CPython:

import inspect
record=inspect.getouterframes(inspect.currentframe())[1]
frame=record[0]

if 'FOO' in frame.f_globals:
    print 'FOO in globals'
else:
    print 'nah'

% python
>>> import test
nah
>>> 

% python
>>> FOO=True
>>> import test
FOO in globals
>>>