[Tutor] How to use a module when only import package

[Karim]

On 04/08/2011 11:13 AM, leechau wrote:
> Steven wrote:
>> leechau wrote:
>>> I wrote module1 in package1, and want to use a method named 
>>> 'method1' in
>>> module1, the caller(test.py) is like this:
>>>
>>> import package1
>>> package1.module1.method1()
>> [...]
>>> When i run test.py, the output is:
>>> AttributeError: 'module' object has no attribute 'module1'
>>> File "e:\MyDoc\GODU_BVT\test.py", line 2, in <module>
>>>   package1.module1.method1()
>>>
>>> If test.py is modified to:
>>> import package1.module1
>>> ...
>>> then everything goes well.
>>
>> Yes, that is correct, and that is a deliberate design.
>>
>> What if your package had a 1000 sub-modules, each of which were big? You
>> wouldn't want loading the main package to automatically load all 1000
>> sub-modules, if you only needed 1.
>>
>> You either import the sub-module by hand:
>>
>> import package1.module1
>>
>> and now you can use package1.module1.method1 (not really a method,
>> actually a function). If you want module1 to automatically be available
>> after importing the package, include one of these in the package1
>> __init__.py file:
>>
>> import module1  # should work in Python 2
>>
>>
>> and now package1 will include the module1 in its namespace.
>>
>>
>> -- 
>> Steven
>
> Thanks for Steven's exellent and patient explanations. How should I do 
> if automatically import a module in Python 3? Thanks again.
>
> -- 
> leechau
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Hello,

Test it simply!
You will get answer in 3 seconds.

;o)
Regards
Karim