Type Hierarchies
Burkhard Kloss
bk at xk7.com
Wed Feb 14 06:12:20 EST 2001
Is there a way to check whether an object is a sequence? I'm not interested
in the specific type, just that it qualifies as a sequence, so it could be
built-in or user defined sequence. The language spec talks about type
hierarchies, but if there's any way to access that concept in code I must
have missed it.
Obviously I can try a call, and catch the exception:
def is_seq(a):
try:
len(a)
return 1
except:
return 0
which works:
assert is_seq( [] )
assert is_seq( () )
assert is_seq( "" )
assert not is_seq( 1 )
but isn't very elegant. It's probably also not very fast...
Am I missing something obvious here? Are there better ways?
Thanks,
Burkhard
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