How to add a relative reference to a global variable in init.py in parent package from patch.object()?

Question

I have the file structure as follow:

In /packageA/__init__.py:

from my_mako_stuff import mako_lookup

...
def func_in_package():
    ...
    template = mako_lookup(...)

In /packageA/mas.py:

from . import func_in_package

...# do some stuff with `func_in_package`

In /packageA/mas_test.py:

from .mas import *

mocked_templatelookup = MagicMock(get_template=Mock())
with patch.object(.mas.parent, # this fails because the reference doesn't work
                  'mako_lookup',
                   new=mocked_templatelookup,
                   create=True):
  ...

How to properly reference the mako_lookup global variable defined in the packageA's __init__.py module, from the mas_test.py which itself is within that package?

EDITTING NOTES: As requested, I run this code as is and get a SyntaxError as follow:

File "mas_test.py", line 57
    with patch.object(.mas.parent, # this fails because the reference doesn't work
                      ^
SyntaxError: invalid syntax

@Mr_and_Mrs_D that's the pseudo code representing the package where this testing code resides in. — Jinghui Niu, Jan 17 '22 at 01:36
@Mr_and_Mrs_D, NameError. It's pseudo code afterall, not totally unexpected. — Jinghui Niu, Jan 17 '22 at 10:34
Add the traceback to the question, please. Does the solution by chepner works? — Mr_and_Mrs_D, Jan 17 '22 at 10:43
@Mr_and_Mrs_D traceback added. The solution suggested by chepner works, but it isn't the question that I intended. I was wondering if a relative reference here is possible. Thanks for your attention. — Jinghui Niu, Jan 17 '22 at 10:57

score 0 · Answer 1 · answered Jan 16 '22 at 21:08

0

Just patch the name packageA.mako_lookup, since that is what func_in_package uses.

with patch('packageA.mako_lookup', new=mocked_templatelookup, create=True):
    ...

answered Jan 16 '22 at 21:08

chepner

497,756
71
530
681

Yes, but how to use relative path? – Jinghui Niu Jan 17 '22 at 01:37
I wouldn't bother. – chepner Jan 17 '22 at 13:35

How to add a relative reference to a global variable in __init__.py in parent package from patch.object()?

1 Answers1

How to add a relative reference to a global variable in init.py in parent package from patch.object()?