Why python mock patch doesn’t work?

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Access bar using spike.bar. Imported bar is not affected by mock.patch.

from unittest import TestCase
import unittest
from mock import patch, MagicMock
from spike import T1
import spike # <----


class TestShit(TestCase):
    @patch('spike.T1.foo', MagicMock(return_value="patched"))
    def test_foo(self):
        foo = T1().get_foo()
        self.assertEqual('patched', foo)

    @patch('spike.bar')
    def test_bar(self, mock_obj):
        mock_obj.return_value="patched"
        bar = spike.bar() # <-----
        self.assertEqual('patched', bar)


if __name__ == "__main__":
    unittest.main()

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