List:
I have this:
# classC.py
class C(object): pass
class D(C): pass
class E(C): pass
def CSubclasses():
for name in dir(): pass
I'm trying to create a list of all of C's subclasses:
import classC
print C
aList = []
for name in dir(classC):
print name,
try:
if issubclass(classC.__dict__[name], C):
print classC.__dict__[name]
else:
print
except TypeError:
print
Which gives me this:
<class '__main__.C'>
C
CSubclasses
D
E
__builtins__
__doc__
__file__
__name__
However when I do this from the command line: issubclass(D,C)
True
but
issubclass(classC.__dict__['D'], C)
False
So my approach is flawed.
The end result I'm after is an automatically generated dictionary
containing instaces of the subclasses keyed by the subclass names:
{'D':D(), 'E':E(), . . . }
I can see the information I need in the module's __dict__ and by using
the dir() method, but I'm not having much success extracting it. 5 1254
> The end result I'm after is an automatically generated dictionary containing instaces of the subclasses keyed by the subclass names:
{'D':D(), 'E':E(), . . . }
I can see the information I need in the module's __dict__ and by using the dir() method, but I'm not having much success extracting it.
Use a metaclass:
subclassesofc = []
class SubclassCollector(type):
def __new__(cls, name, bases, dict):
subclassesofc.append(name)
return type.__new__(cls, name, bases, dict)
class C(object):
__metaclass__ = SubclassCollector
class A(C):
pass
print subclassesofc
Regards,
Diez
Charles Krug a écrit : List:
I have this:
# classC.py
class C(object): pass
class D(C): pass
class E(C): pass
def CSubclasses(): for name in dir(): pass
I'm trying to create a list of all of C's subclasses:
import classC
print C aList = [] for name in dir(classC): print name, try: if issubclass(classC.__dict__[name], C): print classC.__dict__[name] else: print except TypeError: print
Where is C defined ? import classC
does not define the name C in the current scope ... thus, you should write :
for name in dir(classC):
print name,
try:
if issubclass(classC.__dict__[name], classC.C):
print classC.__dict__[name]
else:
print
except TypeError:
print
and it gives :
C <class 'test_subclass.C'>
CSubclasses
D <class 'test_subclass.D'>
E <class 'test_subclass.E'>
__builtins__
__doc__
__file__
__name__
.... which is exactly what you want !
Pierre
Which gives me this:
<class '__main__.C'> C CSubclasses D E __builtins__ __doc__ __file__ __name__
However when I do this from the command line:
issubclass(D,C) True
but
issubclass(classC.__dict__['D'], C)
False
So my approach is flawed.
The end result I'm after is an automatically generated dictionary containing instaces of the subclasses keyed by the subclass names:
{'D':D(), 'E':E(), . . . }
I can see the information I need in the module's __dict__ and by using the dir() method, but I'm not having much success extracting it.
Charles Krug wrote: The end result I'm after is an automatically generated dictionary containing instaces of the subclasses keyed by the subclass names:
{'D':D(), 'E':E(), . . . }
I can see the information I need in the module's __dict__ and by using the dir() method, but I'm not having much success extracting it.
Try this:
class C(object): pass
class D(C): pass
class E(C): pass
def CSubclasses():
return dict((cls.__name__, cls) for cls in C.__subclasses__())
print CSubclasses()
Charles Krug <cd****@aol.com> wrote:
... I'm trying to create a list of all of C's subclasses:
There's a class method for that very purpose: class C(object): pass
.... class D(C): pass
.... class E(C): pass
.... C.__subclasses__()
[<class '__main__.D'>, <class '__main__.E'>]
Alex
On 2006-01-16, Alex Martelli <al***@mail.comcast.net> wrote: Charles Krug <cd****@aol.com> wrote: ... I'm trying to create a list of all of C's subclasses:
There's a class method for that very purpose:
class C(object): pass ... class D(C): pass ... class E(C): pass ... C.__subclasses__() [<class '__main__.D'>, <class '__main__.E'>]
Alex
Exactly what I was looking for, thanks.
It stuck in my brain that there was a way to do this, but I couldn't lay
my mouse on it. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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