python: check if list is multidimensional or one dimensional

Question

I am currently programing in python and I created a method that inputs list from the user, without knowing whether he is multidimensional or one dimensional. how do I check? sample:

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def __init__(self,target):    
    for i in range(len(target[0])):
        w[i]=np.random.rand(len(example[0])+1)

target is the list. the problem is that target[0] might be int.

Answer 1

I think you just want isinstance ?

Example usage:

>>> a = [1, 2, 3, 4]
>>> isinstance(a, list)
True
>>> isinstance(a[0], list)
False
>>> isinstance(a[0], int)
True
>>> b = [[1,2,3], [4, 5, 6], [7, 8, 9]]
>>> isinstance(b[0], list)
True