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| the EMAbstractFactory class in is defined in EMAN2.py | The EMAbstractFactory class is defined in EMAN2.py. It can be used for designing factory based python code. It is initially taken from [http://code.activestate.com/recipes/86900/ a factory in python] |
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| >>> from EMAN2 import EMAbstractFactory | >>from EMAN2 import EMAbstractFactory |
The EMAbstractFactory class is defined in EMAN2.py. It can be used for designing factory based python code. It is initially taken from [http://code.activestate.com/recipes/86900/ a factory in python]
1 >>from EMAN2 import EMAbstractFactory
2 >>f=EMAbstractFactory()
3 >>class A:pass
4 >>f.register("createA",A)
5 >>f.createA()
6 <__main__.A instance at 01491E7C>
7
8 >>> class B:
9 ... def __init__(self, a,b=1):
10 ... self.a=a
11 ... self.b=b
12 ...
13 >>> f.register("createB",B,1,b=2)
14 >>> f.createB()
15 >>> b=f.createB()
16 >>>
17 >>> b.a
18 1
19 >>> b.b
20 2
21
22 >>> class C:
23 ... def __init__(self,a,b,c=1,d=2):
24 ... self.values = (a,b,c,d)
25 ...
26 >>> f.register("createC",C,1,c=3)
27 >>> c=f.createC(2,d=4)
28 >>> c.values
29 (1, 2, 3, 4)
30
31 >>> f.register("importSerialization",__import__,"cPickle")
32 >>> pickle=f.importSerialization()
33 >>> pickle
34 <module 'cPickle' (built-in)>
35 >>> f.register("importSerialization",__import__,"marshal")
36 >>> pickle=f.importSerialization()
37 >>> pickle
38 <module 'marshal' (built-in)>
39
40 >>> f.unregister("importSerialization")
41 >>> f.importSerialization()
42 Traceback (most recent call last):
43 File "<interactive input>", line 1, in
44 AttributeError: Factory instance has no attribute 'importSerialization'