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Re: Mystery of module bindings!

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  Re: Mystery of module bindings! Ethan Furman <ethan@stoneleaf.us> - 2013-04-29 12:53 -0700

#44523 — Re: Mystery of module bindings!

On 04/29/2013 12:30 PM, Peter Rowat wrote:
> This must be a trivial question:
>
> I have "import numpy as np" in the python startup file.
>
> A file called mod1.py contains "def myfn..."
>   and inside myfn there is a call to, say, "np.convolve".
>
> Interactively:
>> python
> .... (numpy imported as np)
>
>> import mod1
>>
>> mod1.myfn(...)
>
> Error: global name "np" is not known.
> =======
> Why is "np" not known to functions in an imported module ?
> =======
>
> I can fix this by including "import numpy as np" in any module that uses numpy
> functions -- but then what is the point of having a startup file?

That "fix" is indeed the way things are done.  Modules only know about what they import or create*.

The point of the startup file is to have things ready for interactive investigation -- if you use numpy *alot* then 
having it already there beats the heck out of typing `import numpy as np` every time you start the interpreter.

--
~Ethan~

*Unless you start playing with injection and stuff.

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