BUG: is_superperiod and is_subperiod cannot handle higher freq than S

doc/source/v0.15.0.txt

@@ -192,6 +192,7 @@ Bug Fixes
 
 
 
+- Bug in ``is_superperiod`` and ``is_subperiod`` cannot handle higher frequencies than ``S`` (:issue:`7760`, :issue:`7772`, :issue:`7803`)
 
 
 

pandas/tseries/frequencies.py

@@ -929,25 +929,31 @@ def is_subperiod(source, target):
         if _is_quarterly(source):
             return _quarter_months_conform(_get_rule_month(source),
                                            _get_rule_month(target))
-        return source in ['D', 'C', 'B', 'M', 'H', 'T', 'S']
+        return source in ['D', 'C', 'B', 'M', 'H', 'T', 'S', 'L', 'U', 'N']
     elif _is_quarterly(target):
-        return source in ['D', 'C', 'B', 'M', 'H', 'T', 'S']
+        return source in ['D', 'C', 'B', 'M', 'H', 'T', 'S', 'L', 'U', 'N']
     elif target == 'M':
-        return source in ['D', 'C', 'B', 'H', 'T', 'S']
+        return source in ['D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif _is_weekly(target):
-        return source in [target, 'D', 'C', 'B', 'H', 'T', 'S']
+        return source in [target, 'D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif target == 'B':
-        return source in ['B', 'H', 'T', 'S']
+        return source in ['B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif target == 'C':
-        return source in ['C', 'H', 'T', 'S']
+        return source in ['C', 'H', 'T', 'S', 'L', 'U', 'N']
     elif target == 'D':
-        return source in ['D', 'H', 'T', 'S']
+        return source in ['D', 'H', 'T', 'S', 'L', 'U', 'N']
     elif target == 'H':
-        return source in ['H', 'T', 'S']
+        return source in ['H', 'T', 'S', 'L', 'U', 'N']
     elif target == 'T':
-        return source in ['T', 'S']
+        return source in ['T', 'S', 'L', 'U', 'N']
     elif target == 'S':
-        return source in ['S']
+        return source in ['S', 'L', 'U', 'N']
+    elif target == 'L':
+        return source in ['L', 'U', 'N']
+    elif target == 'U':
+        return source in ['U', 'N']
+    elif target == 'N':
+        return source in ['N']
 
 
 def is_superperiod(source, target):
@@ -982,25 +988,31 @@ def is_superperiod(source, target):
             smonth = _get_rule_month(source)
             tmonth = _get_rule_month(target)
             return _quarter_months_conform(smonth, tmonth)
-        return target in ['D', 'C', 'B', 'M', 'H', 'T', 'S']
+        return target in ['D', 'C', 'B', 'M', 'H', 'T', 'S', 'L', 'U', 'N']
     elif _is_quarterly(source):
-        return target in ['D', 'C', 'B', 'M', 'H', 'T', 'S']
+        return target in ['D', 'C', 'B', 'M', 'H', 'T', 'S', 'L', 'U', 'N']
     elif source == 'M':
-        return target in ['D', 'C', 'B', 'H', 'T', 'S']
+        return target in ['D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif _is_weekly(source):
-        return target in [source, 'D', 'C', 'B', 'H', 'T', 'S']
+        return target in [source, 'D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif source == 'B':
-        return target in ['D', 'C', 'B', 'H', 'T', 'S']
+        return target in ['D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif source == 'C':
-        return target in ['D', 'C', 'B', 'H', 'T', 'S']
+        return target in ['D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif source == 'D':
-        return target in ['D', 'C', 'B', 'H', 'T', 'S']
+        return target in ['D', 'C', 'B', 'H', 'T', 'S', 'L', 'U', 'N']
     elif source == 'H':
-        return target in ['H', 'T', 'S']
+        return target in ['H', 'T', 'S', 'L', 'U', 'N']
     elif source == 'T':
-        return target in ['T', 'S']
+        return target in ['T', 'S', 'L', 'U', 'N']
     elif source == 'S':
-        return target in ['S']
+        return target in ['S', 'L', 'U', 'N']
+    elif source == 'L':
+        return target in ['L', 'U', 'N']
+    elif source == 'U':
+        return target in ['U', 'N']
+    elif source == 'N':
+        return target in ['N']
 
 
 def _get_rule_month(source, default='DEC'):

pandas/tseries/tests/test_frequencies.py

@@ -342,6 +342,16 @@ def test_is_superperiod_subperiod():
     assert(fmod.is_superperiod(offsets.Hour(), offsets.Minute()))
     assert(fmod.is_subperiod(offsets.Minute(), offsets.Hour()))
 
+    assert(fmod.is_superperiod(offsets.Second(), offsets.Milli()))
+    assert(fmod.is_subperiod(offsets.Milli(), offsets.Second()))
+
+    assert(fmod.is_superperiod(offsets.Milli(), offsets.Micro()))
+    assert(fmod.is_subperiod(offsets.Micro(), offsets.Milli()))
+
+    assert(fmod.is_superperiod(offsets.Micro(), offsets.Nano()))
+    assert(fmod.is_subperiod(offsets.Nano(), offsets.Micro()))
+
+
 if __name__ == '__main__':
     import nose
     nose.runmodule(argv=[__file__, '-vvs', '-x', '--pdb', '--pdb-failure'],

pandas/tseries/tests/test_plotting.py

@@ -707,6 +707,28 @@ def test_from_weekly_resampling(self):
         for l in ax.get_lines():
             self.assertTrue(PeriodIndex(data=l.get_xdata()).freq.startswith('W'))
 
+    @slow
+    def test_mixed_freq_second_millisecond(self):
+        # GH 7772, GH 7760
+        idxh = date_range('2014-07-01 09:00', freq='S', periods=50)
+        idxl = date_range('2014-07-01 09:00', freq='100L', periods=500)
+        high = Series(np.random.randn(len(idxh)), idxh)
+        low = Series(np.random.randn(len(idxl)), idxl)
+        # high to low
+        high.plot()
+        ax = low.plot()
+        self.assertEqual(len(ax.get_lines()), 2)
+        for l in ax.get_lines():
+            self.assertEqual(PeriodIndex(data=l.get_xdata()).freq, 'L')
+        tm.close()
+
+        # low to high
+        low.plot()
+        ax = high.plot()
+        self.assertEqual(len(ax.get_lines()), 2)
+        for l in ax.get_lines():
+            self.assertEqual(PeriodIndex(data=l.get_xdata()).freq, 'L')
+
     @slow
     def test_irreg_dtypes(self):
         # date