Retrieving Values from Module by Name?

Question

I'm attempting to read the following data from a separate .py file in a different directory, specifically: "assets.ovs.screen0".

Show here is the contents of assets.ovs.screen0.placement:

selection_Size = [600,110]
selection_Loc  = [1500-600,208]
selection_Mov  = [0,115]

At the base of the tree is a file, test.py, currently reading:

import assets.ovs.screen0.placement as placement

requiredVar = "select_"

print placement.select_Size
print eval("placement."+ requiredVar)

Assuming there is a safer/easier way of doing this, what would it be?

If i understand you correctly you want to get an attribute by name. Try `val = getattr(obj, 'attr_name', default_value)`. Also see (https://docs.python.org/2/library/functions.html#getattr) — jandob, Mar 13 '15 at 18:23

James Sapam · Accepted Answer · 2015-03-13T18:34:37.037

2

Can i try this way:

param = ["selection_Size", "selection_Loc", "selection_Mov", "error"]
for par in param:
    print par, placement.__dict__.get(par, None)

    # this should work too
    # print par, getattr(placement, par, None)

Output:

selection_Size [600, 110]
selection_Loc [900, 208]
selection_Mov [0, 115]
error None

edited Mar 13 '15 at 18:34

answered Mar 13 '15 at 18:27

James Sapam

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i think he should better use `getattr()` instead of the `__dict__.get()` lookup. (http://stackoverflow.com/a/14084917/2972353) – jandob Mar 13 '15 at 18:32
Why wouldn't a module have a dict though? That answer was geared towards classes. – derkyzer Mar 13 '15 at 18:36
@kweb123 you are right, we can use class with __getattr__. – James Sapam Mar 13 '15 at 18:39
True, but think using the built-in should be prefered before using magic methods directly. Just not to devolop a bad habbit :) – jandob Mar 13 '15 at 18:41

Retrieving Values from Module by Name?

1 Answers1