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POPython class factory problem referencing base class?
 

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  1. POPython class factory problem referencing base class?
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    <p>I recently came across a <a href="https://stackoverflow.com/questions/456672/class-factory-in-python">Python class factory implementation</a> that fit a problem I am working on really well. The only difference is that I wanted have the base and sub classes in different packages.</p> <p>When I try to do this, however, I run into a problem whenever I try to load the base class.</p> <p>Structure:</p> <p><strong>BaseClass.py</strong></p> <pre><code>from subclasses import * def NewClass(): """Map Factory""" for cls in BaseClass.__subclasses__(): print "checking class..." class BaseClass(object): def __init__(self): print("Building an abstract BaseMap class..") </code></pre> <p><strong>subclasses/__init__.py</strong></p> <pre><code>__all__=['SubClass'] </code></pre> <p><strong>subclasses/SubClass.py</strong></p> <pre><code>from BaseClass import BaseClass class SubClassA(BaseClass): def __init__(self): print('Instantiating SubClassA') </code></pre> <p>When I try to import BaseClass though I get the following error:</p> <pre> 1 #import BaseClass ----> 2 from BaseClass import BaseClass 3 class SubClassA(BaseClass): 4 def __init__(self): 5 print('Instantiating SubClassA') <b>ImportError: cannot import name</b> BaseClass </pre> <p>I also tried using "import BaseClass" and then subclassing "BaseClass.BaseClass" but that resulted in a different error:</p> <pre> 1 import BaseClass ----> 2 class SubClassA(BaseClass.BaseClass): 3 def __init__(self): 4 print('Instantiating SubClassA') <b>AttributeError: 'module' object has no attribute 'BaseClass'</b> </pre> <p>Finally, If I just try to create the subclass directory there is no problem. It is only when I try to import the BaseClass module that things go wrong.</p> <p>Any ideas?</p>
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    1. USKeith Hughitt
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    1. CO"a different error."? Which different error? Please include this error, also. Also, your indentation seems wrong on the BaseClass.py example. Please check it carefully. All code must be indented. And preceded by a blank line. You have a `from subclasses import *` that could be code, but it could also be a part of the question.
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      1. POPython class factory problem referencing base class?
      1. USS.Lott
    2. COThanks S. Lott. I fixed the issues you mentioned. I originally thought that adding the second error might be too much so I left it out. The output is up now.
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      1. USKeith Hughitt
    3. CO"adding the second error might be too much"? That's not really possible. If you had another error, you **must** document the error. Anything else is unacceptable because you've omitted part of the problem.
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