symtable: get_namespace doesn't check whether if there are multiple namespaces or no namespaces at all

[isidentical]

BPO	42355
Nosy	@benjaminp, @isidentical
PRs	bpo-42355: symtable.get_namespace() now checks whether there are multiple or any namespaces found #23278

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/isidentical'
closed_at = <Date 2021-07-18.12:56:44.076>
created_at = <Date 2020-11-14.10:27:36.184>
labels = ['type-bug', 'library', '3.10']
title = "symtable: get_namespace doesn't check whether if there are multiple namespaces or no namespaces at all"
updated_at = <Date 2021-07-18.16:35:05.378>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2021-07-18.16:35:05.378>
actor = 'BTaskaya'
assignee = 'BTaskaya'
closed = True
closed_date = <Date 2021-07-18.12:56:44.076>
closer = 'BTaskaya'
components = ['Library (Lib)']
creation = <Date 2020-11-14.10:27:36.184>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 42355
keywords = ['patch']
message_count = 2.0
messages = ['380969', '397748']
nosy_count = 2.0
nosy_names = ['benjamin.peterson', 'BTaskaya']
pr_nums = ['23278']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42355'
versions = ['Python 3.10']

[isidentical]

>>> 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()
()

[isidentical]

New changeset a045991 by Batuhan Taskaya in branch 'main':
bpo-42355: symtable.get_namespace() now checks whether there are multiple or any namespaces found (GH-23278)
a045991