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How to correctly extend variable __all__ in a __init__.py?


How to correctly extend variable __all__ in a __init__.py?

By : jaemin park
Date : November 22 2020, 03:01 PM
I hope this helps . If you take another look at numpy's top-level __init__ module you'll see that for each from . import xyz that's used to extend __all__ there's a corresponding from .xyz import *.
Adding a name to a module's __all__ is meaningless if the corresponding object isn't either defined in the module itself or imported from somewhere else. The __all__ statement doesn't import anything on it's own.
code :


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Recursively populating __all__ in __init__.py

Recursively populating __all__ in __init__.py


By : ILi Ya
Date : March 29 2020, 07:55 AM
this will help You probably shouldn't be doing this: The default behaviour of import is quite flexible. If you don't want a module (or any other variable) to be automatically exported, give it a name that starts with _ and python won't export it. That's the standard python way, and reinventing the wheel is considered unpythonic. Also, don't forget that other things besides modules may need exporting; once you set __all__, you'll need to find and export them as well.
Still, you ask how to best generate a list of your exportable modules. Since you can't export what's not present, I'd just check what modules of your own are known to your main module:
code :
basedir = os.path.dirname(__file__)
for m in sys.modules:
    if m in locals() and not m.startswith('_'): # Only export regular names
        mod = locals()[m]
        if '__file__' in mod.__dict__  and mod.__file__.startswith(basedir):
            print m
No Unicode in `__all__` for a package's `__init__`?

No Unicode in `__all__` for a package's `__init__`?


By : wuzhongming
Date : March 29 2020, 07:55 AM
this will help No, unicode values are not allowed in __all__, because in Python 2 names are strings, not unicode values.
Your indeed have to encode all strings in __all__ or not use unicode literals. You could do so as a separate step:
code :
__all__ = ['SomeClass']
__all__ = [n.encode('ascii') for n in __all__]
__all__ variable not picked up in __init__.py

__all__ variable not picked up in __init__.py


By : user2995225
Date : March 29 2020, 07:55 AM
I wish this helpful for you I think you might be misunderstanding what __all__ does ...
In __init__.py, you want to actually import the modules you want. e.g.
code :
# __init__.py
import example_dir.cooling as cooling
import example_dir.counters as counters
result when __all__ is not defined in __init__.py of package?

result when __all__ is not defined in __init__.py of package?


By : Manolo
Date : March 29 2020, 07:55 AM
hope this fix your issue I am just learning and practicing python,on the way,i am reading about python packages and how to import into other modules or package at Modules ,I assume the following scenario , , When you do
code :
from whatever_package import *
import whatever_package.something_specific
from whatever_package import *
import whatever_package.other_thing
Why should I use __all__ in __init__ of python package?

Why should I use __all__ in __init__ of python package?


By : mrSteveP
Date : March 29 2020, 07:55 AM
I hope this helps . The only time you want to define __all__ in your package's __init__.py is to list the names of "exported" members that you want to export for when a user does:
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