How to check if an object is iterable in Python? [duplicate]

问题

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Closed 8 years ago.

Possible Duplicate:
In Python, how do I determine if an object is iterable?

How does one check if a Python object supports iteration, a.k.a an iterable object (see definition

Ideally I would like function similar to isiterable(p_object) returning True or False (modelled after isinstance(p_object, type)).

回答1:

You can check for this using isinstance and collections.Iterable

>>> from collections import Iterable
>>> l = [1, 2, 3, 4]
>>> isinstance(l, Iterable)
True

回答2:

You don't "check". You assume.

try:
   for var in some_possibly_iterable_object:
       # the real work.
except TypeError:
   # some_possibly_iterable_object was not actually iterable
   # some other real work for non-iterable objects.

It's easier to ask forgiveness than to ask permission.

回答3:

Try this code

def isiterable(p_object):
    try:
        it = iter(p_object)
    except TypeError: 
        return False
    return True

来源：https://stackoverflow.com/questions/4668621/how-to-check-if-an-object-is-iterable-in-python