def test_true_2(self):
     self.assertTrue(isDigit('34.65'))
 def test_false_6(self):
     self.assertFalse(isDigit(' '))
 def test_true_1(self):
     self.assertTrue(isDigit('-234.4'))
 def test_false_4(self):
     self.assertFalse(isDigit('3 4   '))
 def test_false_3(self):
     self.assertFalse(isDigit('3-4'))
 def test_false_1(self):
     self.assertFalse(isDigit('s2324'))
 def test_true_4(self):
     self.assertTrue(isDigit('0.0'))
 def test_true_3(self):
     self.assertTrue(isDigit('-0'))