def test_equals(self):
     self.assertEqual(sum_from_string(
         'In 2015, I want to know how much does iPhone 6+ cost?'), 2021)
 def test_equals_3(self):
     self.assertEqual(sum_from_string('e=mc^2'), 2)
 def test_equals_2(self):
     self.assertEqual(sum_from_string('1+1=2'), 4)
 def test_equals(self):
     self.assertEqual(
         sum_from_string(
             'In 2015, I want to know how much does iPhone 6+ cost?'), 2021)
 def test_equals_3(self):
     self.assertEqual(sum_from_string('e=mc^2'), 2)
 def test_equals_2(self):
     self.assertEqual(sum_from_string('1+1=2'), 4)