您可以这样使用patch：
from unittest.mock import patch, MagicMock
@patch('mypackage.mymodule.pyMysqL')
def test(self, mock_sql):
self.assertIs(mypackage.mymodule.pyMysqL, mock_sql)
conn = Mock()
mock_sql.connect.return_value = conn
cursor = MagicMock()
mock_result = MagicMock()
cursor.__enter__.return_value = mock_result
cursor.__exit___ = MagicMock()
conn.cursor.return_value = cursor
connectDB()
mock_sql.connect.assert_called_with(host='localhost',
user='user',
password='passwd',
db='db')
mock_result.execute.assert_called_with("sql request", ("user", "pass"))
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