Home/ Questions/What should I do with ''typeerror: len() of unsized object'' error?
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ozellahammes
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Asked: 2022-07-30T04:04:42+00:00 In:

What should I do with ”typeerror: len() of unsized object” error?

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I encounter the error ”typeerror: len() of unsized object” when I run my code:

>>> import numpy as np
>>> a = np.array(5)
>>> a
array(5)
>>> len(a)
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    len(a)
TypeError: len() of unsized object
>>>

Can someone give me some solutions for this issue?

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1 Answer

  1. Best Answer
    Expert

    The cause: This error happens because there is only one value (5s) in the array a. The NumPy array a is a scalar and cannot be used as a container type for the len() function because it only contains one value. Because scalars are not container types that can store 0 or more elements, you cannot use the len() function with them. Scalars never have more than one element and don’t have the len() method declared on them.

    Solution: You can use the array.size property which is always defined whether it’s a scalar array or not instead of relying on the len() function to determine the number of elements in a NumPy array:

    >>> import numpy as np
>>> a = np.array(5)
>>> a
array(5)
>>> a.size
1
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