Connection issue

[metro17]

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>>> import pyodbc
>>> conn = pyodbc.connect('Driver={SQL Server};'
...                       'Server=ServerA;'
...                       'Database=TestDb;'
...                       'Trusted_Connection=yes;')
>>>
>>> cursor = conn.cursor()
>>> cursor.execute('SELECT * FROM TestDb.PatientAppointments')

Error:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pyodbc.ProgrammingError: ('42S02', "[42S02] [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object name 'TestDb.PatientAppointments'. (208) (SQLExecDirectW)")

>>>
>>> for row in cursor:
...     print(row)
...