Basic Intro to Python Metaprogramming (opens in new tab)

(bitshaq.com)

82 pointsnuclearsandwich14y ago8 comments

8 comments

For me this article was written in reverse. For an intro I'd love to have had the 'code smell' example first to establish why I might care and when I might need this, and then dive into an example.

irahul14y ago

May be this helps http://blip.tv/pycon-us-videos-2009-2010-2011/pycon-2010-pyt...

endgame14y ago

Can everyone please stop shoehorning in random xkcd comics where they don't belong?

tbh234714y ago

At the risk of introducing another level, I will mention that these comments are very Meta :)

ciupicri14y ago

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You don't have permission to access /2011/07/14/basic-intro-to-python-meta-programming/ on this server.

irahul14y ago

>>> Foo = type("Foo", (FooBase,), {'bar' : 42})

is not equivalent to what the blog post says it is to. FooBase should be defined before running this, and the blog post's equivalent make it look like this statement defines FooBase as well.

jackpirate14y ago

I think you neglected the line in front of it, which does define FooBase.

   1. >>> FooBase = type("FooBase", (object,), {})  
   2. >>> Foo = type("Foo", (FooBase,), {'bar' : 42})

Although I am not a python expert, so you may be right... in which case, how does line one not work?

irahul14y ago

I stand corrected - I was skimming and didn't notice. The example is correct - I was wrong.

j / k navigate · click thread line to collapse

8 comments

iandanforth14y ago

For me this article was written in reverse. For an intro I'd love to have had the 'code smell' example first to establish why I might care and when I might need this, and then dive into an example.

irahul14y ago

May be this helps http://blip.tv/pycon-us-videos-2009-2010-2011/pycon-2010-pyt...

endgame14y ago

Can everyone please stop shoehorning in random xkcd comics where they don't belong?

tbh234714y ago

At the risk of introducing another level, I will mention that these comments are very Meta :)

ciupicri14y ago

Forbidden

You don't have permission to access /2011/07/14/basic-intro-to-python-meta-programming/ on this server.

irahul14y ago

>>> Foo = type("Foo", (FooBase,), {'bar' : 42})

is not equivalent to what the blog post says it is to. FooBase should be defined before running this, and the blog post's equivalent make it look like this statement defines FooBase as well.

jackpirate14y ago

I think you neglected the line in front of it, which does define FooBase.

   1. >>> FooBase = type("FooBase", (object,), {})  
   2. >>> Foo = type("Foo", (FooBase,), {'bar' : 42})

Although I am not a python expert, so you may be right... in which case, how does line one not work?

irahul14y ago

I stand corrected - I was skimming and didn't notice. The example is correct - I was wrong.

j / k navigate · click thread line to collapse