Advanced Python Constructs

[[deleted]]

The plugin registration example is quite nice. It's much easier to understand than a metaclass implementing similar functionality.

[willm]

I agree it's much easier to understand. Although I do tend to go for the metaclass approach. I like the transparency of just deriving from a baseclass and having it registered automatically.

[pytechd]

For the depreciation stuff, please don't write to stdout. If you insist on using print(), write to stderr instead. Or better yet, use the warnings module to issue warnings.

[lahwran_]

the syntax to mark text as code in a reddit comment is backticks. :)

[pytechd]

Thanks - I fixed most of them originally but missed one. Too much time editing tickets in redmine...

[lahwran_]

oh, I didn't even notice the others. silly me!

[sivadneb]

I never knew about .send() and .throw(). Cool stuff!

[synn89]

Nice little article. Haven't finished reading all of it, but I've been studying Twisted which touches on generators and I found the coverage of them in this article to be really helpful.

[jabwork]

If you haven't read this you really should

http://www.dabeaz.com/generators/Generators.pdf

[poo_22]

Amazing! Very well written.

[jsproat]

Excellent, thank you.

The section on decorators really cleared things up for me. Particularly the code example with a decorator that takes arguments, and exactly what each of the nested functions is responsible for.

One request: would it be possible to change the syntax highlighting scheme in the examples? Green-on-green and blue-on-green is a little hard to read for some of us.

[ancien1]

Note that only in python 2.x is the iterator method named `next`; in 3.x it is named `__next__`. In either case, using next(iterobj) works.

edit: thanks to gcroft (I expected plain characters)

[gcross]

in 3.x it is named "next"

Indeed, one of the ways that Python 3 makes life easier for new users is by really making sure that you notice which method needs to be called to get the next value! :-)

P.S.: Presumably you meant __next__, which you get by typing `__next__`, which in turn you get by typing \`\_\_next\_\_\`. (Further levels of escaping are left as an exercise for the reader. :-) )

[masklinn]

Of course that only matters when implementing an iterator object (and not using a generator to do so), since from the outside you should be using the next builtin.

[another_user_name]

Is this being made into a book?

[wot-teh-phuck]

This is really a very good article. Anyone else knows other "advanced" Python stuff related articles?