Fixes fractional seconds padding.

Author: sdispater

pendulum/formatting/alternative_formatter.py

@@ -75,12 +75,12 @@ class AlternativeFormatter(Formatter):
         's': lambda dt: '{:d}'.format(dt.second),
 
         # Fractional second
-        'S': lambda dt: '{:1d}'.format(dt.microsecond // 100000),
-        'SS': lambda dt: '{:2d}'.format(dt.microsecond // 10000),
-        'SSS': lambda dt: '{:3d}'.format(dt.microsecond // 1000),
-        'SSSS': lambda dt: '{:4d}'.format(dt.microsecond // 100),
-        'SSSSS': lambda dt: '{:5d}'.format(dt.microsecond // 10),
-        'SSSSSS': lambda dt: '{:6d}'.format(dt.microsecond),
+        'S': lambda dt: '{:01d}'.format(dt.microsecond // 100000),
+        'SS': lambda dt: '{:02d}'.format(dt.microsecond // 10000),
+        'SSS': lambda dt: '{:03d}'.format(dt.microsecond // 1000),
+        'SSSS': lambda dt: '{:04d}'.format(dt.microsecond // 100),
+        'SSSSS': lambda dt: '{:05d}'.format(dt.microsecond // 10),
+        'SSSSSS': lambda dt: '{:06d}'.format(dt.microsecond),
 
         # Timestamp
         'X': lambda dt: '{:d}'.format(dt.timestamp),

tests/formatting_tests/test_alternative_formatter.py

@@ -120,6 +120,22 @@ def test_fractional_second(self):
         self.assertEqual('12345', f.format(d, 'SSSSS'))
         self.assertEqual('123456', f.format(d, 'SSSSSS'))
 
+        d = Pendulum(2016, 8, 28, 7, 3, 6, 0)
+        self.assertEqual('0', f.format(d, 'S'))
+        self.assertEqual('00', f.format(d, 'SS'))
+        self.assertEqual('000', f.format(d, 'SSS'))
+        self.assertEqual('0000', f.format(d, 'SSSS'))
+        self.assertEqual('00000', f.format(d, 'SSSSS'))
+        self.assertEqual('000000', f.format(d, 'SSSSSS'))
+
+        d = Pendulum(2016, 8, 28, 7, 3, 6, 123)
+        self.assertEqual('0', f.format(d, 'S'))
+        self.assertEqual('00', f.format(d, 'SS'))
+        self.assertEqual('000', f.format(d, 'SSS'))
+        self.assertEqual('0001', f.format(d, 'SSSS'))
+        self.assertEqual('00012', f.format(d, 'SSSSS'))
+        self.assertEqual('000123', f.format(d, 'SSSSSS'))
+
     def test_timezone(self):
         f = AlternativeFormatter()
         d = Pendulum(2016, 8, 28, 7, 3, 6, 123456, 'Europe/Paris')