Python Best Practice Patterns
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Python Best Practice Patterns
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Re: Python Best Practice Patterns
#2I never knew you could use __enter__ and __exit__ to code your own things that work with the 'with' statement. Well worth the read!
Re: Python Best Practice Patterns
#3And the most important pattern:
http://stackoverflow.com/questions/1275646/python-3-and-stat...
Re: Python Best Practice Patterns
#4I never knew you could use __enter__ and __exit__ to code your own things that work with the 'with' statement. Well worth the read!
For simple context managers, an easier method is to use contextlib.contextmanager (http://docs.python.org/library/contextlib.html).
from contextlib import contextmanager
@contextmanager
def tag(name):
print "" % name
yield
print "" % name
with tag("h1"):
print "foo"
"""
foo
"""Re: Python Best Practice Patterns
#5I never knew you could use __enter__ and __exit__ to code your own things that work with the 'with' statement. Well worth the read!
You don't even have to create a full object if there's no need to:
@contextlib.contextmanager
def manager(*args):
object = initialize(args)
try:
yield object
finally:
# cleanup
object.close()Re: Python Best Practice Patterns
#6You should name a classmethod first variable "cls", not "class_".
Re: Python Best Practice Patterns
#7I'm skeptical about the last one return None
Re: Python Best Practice Patterns
#8I never knew you could use __enter__ and __exit__ to code your own things that work with the 'with' statement. Well worth the read!
You might be interested in the docs on the Data Model [0] to learn more about the various "dunder" (__foo__) methods. There are a ton of cool things you can do with python objects.
Re: Python Best Practice Patterns
#9Several of those patterns are incomplete or frowned upon:
* if a method does not use the object's state (no `self` usage) make it a `class-` or `staticmethod`.
* Some magic methods are presented. There's more to them[0].
* one should not write `class MyClass:` but `class MyClass(object):` (new style class[1])
* the last one (`return None`) make me very dubious
* Cascading methods: that's a big no. The idiom is that if a method may change the state of the object then it should return None (eg `set.add`)
0: well-written and comprehensive guide: http://www.rafekettler.com/magicmethods.html
Re: Python Best Practice Patterns
#10Several of those patterns are incomplete or frowned upon: * if a method does not use the object's state (no `self` usage) make it a `class-` or `staticmethod`. * Some magic methods are presented. There's more to them[0]. * one should not write `class MyClass:` but `class MyClass(object):` (new style class[1]) * the last one (`return None`) make me very dubious * Cascading methods: that's a big no . The idiom is that…
It seems he's using Python 3 (using print as a function), so no need to inherit object.