>>> table = symtable.symtable("A = 1", "<string>", "exec")
>>> table.lookup("A")
<symbol 'A'>
>>> table.lookup("A").get_namespace()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.10/symtable.py", line 312, in get_namespace
    raise ValueError("name is bound to multiple namespaces")
ValueError: name is bound to multiple namespaces
>>> table.lookup("A").get_namespaces()
()