Python 3 Patterns & Idioms / code / Metaclasses / SimpleMeta2.py

# Metaclasses/SimpleMeta2.py
# Combining the steps for metaclass creation in Python 2.x

class Simple2(object):
    class __metaclass__(type):
        def __init__(cls, name, bases, nmspc):
            # This won't work:
            # super(__metaclass__, cls).__init__(name, bases, nmspc)
            # Less-flexible specific call:
            type.__init__(cls, name, bases, nmspc)
            cls.uses_metaclass = lambda self : "Yes!"

class Simple3(Simple2): pass
simple = Simple3()
print simple.uses_metaclass()

""" Output:
Yes!
"""
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.