If I have an array of
g = ['hi']
Then
'hi' in g
returns True.
What if I put an instantiated class into an array.
g.append(MyClass())
How do I find if the array contains an object of this class.
MyClass in g
returns False
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3 Answers
use isinstance() and any():
In [95]: class A:pass
In [96]: lis=[A()]
In [97]: any(isinstance(x,A) for x in lis)
Out[97]: True
In [98]: lis=[1,2,3]
In [99]: any(isinstance(x,A) for x in lis)
Out[99]: False
answered Nov 11, 2012 at 20:29
Ashwini Chaudhary
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Comments
Try this:
MyClass in [type(x) for x in g]
This will only find objects whose exact type is MyClass; it will not find objects of a class derived from MyClass. To do that, try one of the other answers that makes use of isinstance().
Example:
>>> class Foo(object): pass
...
>>> g = [1, 2, Foo(), 4]
>>> g
[1, 2, <__main__.Foo object at 0x7f59552ef750>, 4]
>>> Foo in [type(x) for x in g]
True
1 Comment
Ashwini Chaudhary
use a generator expression for short-circuiting :
Foo in (type(x) for x in g)any(isinstance(x, MyClass) for x in g)
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