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POExtending module functionality in python
 

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  1. POExtending module functionality in python
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    <p>I have a series of modules, each of which contains a behavior which I want to mix into a class via composition. Since each of these modules has some common &amp; redundant code, I attempted to extract out a base module which I could then import into each module, filling in the custom code while cutting out the boilerplate. A simplified version of my code is below:</p> <p>main.py:</p> <pre><code>import concrete as steak_sauce class Customer(): def __init__(self): self.allergies = ["onions"] self.dish = [] def register_ingredient (steak_sauce): self.dish.append(ingredient) customer = Customer() customer.eat_if_not_allergic(steak_sauce) </code></pre> <p>base.py:</p> <pre><code># Base module menu_item_name = "default" menu_item_ingredients = [] def is_allergic(customer): if menu_item_name in customer.allergies: return True else: add_to_dish(menu_item_name) def eat_if_not_allergic(customer): if not is_allergic(customer): eat_it(ingredient) </code></pre> <p>concrete.py:</p> <pre><code>from base import * menu_item_name = "steak sauce" menu_item_ingredients = ["MSG", "Blood"] def eat_it(customer): print "custom logic acting on customer goes here" </code></pre> <p>When I run main.py, I get an exception:</p> <pre><code>Traceback (most recent call last): File "main.py", line 14, in &lt;module&gt; customer.add_if_not_allergic(steak_sauce) File "main.py", line 10, in add_if_not_allergic if not ingredient.is_allergic(customer): File "/home/chazu/tests/base.py", line 10, in is_allergic add_to_dish(menu_item_name) NameError: global name 'eat_it' is not defined </code></pre> <p>My question is this: Is there a way to extend the functionality of a module, or inversely to extract common functionality out of multiple modules into a base module, without lots of extra lines of code? What is the pythonic way?</p> <p>Thanks in advance =)</p>
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    1. PTQuestion
    1. USChazu
    1. USChazu
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    1. COis there a reason not to make is_allergic() a method of Customer? add_to_dish() looks like it should be a Customer method too.
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      1. POExtending module functionality in python
      1. USmonkut
    2. COIn my use case, each ingredient will need to implement custom behavior in the add_to_dish() method...And I want to be able to add that functionality into Customer without having to inherit every ingredient...My example doesn't illustrate that very well, actually. I need to edit it when I'm able.
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      1. USChazu
    3. COIs there a reason to break all the code up? Your problem in the exception is that you haven't imported "add_to_dish" into base.py.
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      1. POExtending module functionality in python
      1. USmonkut
 

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