How do I test if an object is a sequence?

[Cousin Stanley]

| Is there a common idiom for testing if an object is a sequence?
| .... 

Max M .... 

    What about checking against a pre-defined dictionary
    of types ???

>>>
>>> def isseq( obj ) :
...     seq_types = { list :  1 , tuple :  1 , dict :  1 }
...     if seq_types.has_key( type( obj ) ) :
...        return True
...     else :
...        return False
...
>>>
>>> l = []
>>> t = ()
>>> d = {}
>>> n = 42
>>> s = "Yo Ho Ho and a bottle o' Rum"
>>>
>>> isseq( l )
True
>>>
>>> isseq( t )
True
>>>
>>> isseq( d )
True
>>>
>>> isseq( n )
False
>>>
>>> isseq( s )
False

-- 
Cousin Stanley
Human Being
Phoenix, Arizona