<details><summary>Test output</summary><br><pre>Traceback (most recent call last):

 "/workspace/spanner/cloud-client/snippets_test.py", line 102, in test_read_stale_data
assert 'SingerId: 1, AlbumId: 1, MarketingBudget: None' in outAssertionError: assert 'SingerId: 1, AlbumId: 1, MarketingBudget: None' in 'SingerId: 1, AlbumId: 1, MarketingBudget: 100000\nSingerId: 1, AlbumId: 2, MarketingBudget: None\nSingerId: 2, AlbumI...ketingBudget: None\nSingerId: 2, AlbumId: 2, MarketingBudget: 500000\nSingerId: 2, AlbumId: 3, MarketingBudget: None\n'</pre></details>
Traceback (most recent call last):


 "terminal_example.py", line 30, in <module>

bot_input = bot.get_response(None)


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chatterbot/chatterbot.py", line 113, in get_response

statement, response = self.generate_response(input_statement, conversation_id)


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chatterbot/chatterbot.py", line 132, in generate_response

response = self.logic.process(input_statement)


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chatterbot/logic/multi_adapter.py", line 49, in process

if adapter.can_process(statement):


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chatterbot/logic/mathematical_evaluation.py", line 33, in can_process

response = self.process(statement)


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chatterbot/logic/mathematical_evaluation.py", line 59, in process

mathparse.parse(expression, language=self.language)


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/mathparse/mathparse.py", line 269, in parse

postfix = to_postfix(tokens)


 "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/mathparse/mathparse.py", line 176, in to_postfix

while (opstack != []) and (precedence[opstack[-1]] >= precedence[token]):
KeyError: '9ty'
