You have assigned a bytes value to the name bytes:
>>> bytes([10, 20, 30, 40])
b'\n\x14\x1e('
>>> bytes = bytes([10, 20, 30, 40])
>>> bytes([10, 20, 30, 40])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'bytes' object is not callable
bytes is now bound to the value b'\n\x14\x1e(', which is not callable. This
global is shadowing the built-in. Delete it:del bytes -- https://mail.python.org/mailman/listinfo/python-list
