>>> arr.itemsize
4
>>> arr.length
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'array.array' object has no attribute 'length'
>>> arr.length()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'array.array' object has no attribute 'length'
>>> arr.array_length()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'array.array' object has no attribute 'array_length'
>>> arr.length()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'array.array' object has no attribute 'length'
>>> arr.length
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'array.array' object has no attribute 'length'