Merge pull request #3379 from y-p/timestamp_repr

ENH/CLN: make Timestamp repr valid python code, like datetime does.

Author: y-p

pandas/tseries/tests/test_period.py

@@ -1298,6 +1298,14 @@ def test_to_timestamp_preserve_name(self):
         conv = index.to_timestamp('D')
         self.assertEquals(conv.name, 'foo')
 
+    def test_to_timestamp_repr_is_code(self):
+        zs=[Timestamp('99-04-17 00:00:00',tz='UTC'),
+        Timestamp('2001-04-17 00:00:00',tz='UTC'),
+        Timestamp('2001-04-17 00:00:00',tz='America/Los_Angeles'),
+        Timestamp('2001-04-17 00:00:00',tz=None)]
+        for z in zs:
+            self.assertEquals( eval(repr(z)), z)
+
     def test_as_frame_columns(self):
         rng = period_range('1/1/2000', periods=5)
         df = DataFrame(randn(10, 5), columns=rng)

pandas/tslib.pyx

@@ -164,20 +164,25 @@ class Timestamp(_Timestamp):
 
     def __repr__(self):
         result = self._repr_base
+        zone = None
 
         try:
             result += self.strftime('%z')
             if self.tzinfo:
                 zone = _get_zone(self.tzinfo)
-                result += _tz_format(self, zone)
         except ValueError:
             year2000 = self.replace(year=2000)
             result += year2000.strftime('%z')
             if self.tzinfo:
                 zone = _get_zone(self.tzinfo)
-                result += _tz_format(year2000, zone)
 
-        return '<Timestamp: %s>' % result
+        try:
+            result += zone.strftime(' %%Z')
+        except:
+            pass
+        zone = "'%s'" % zone if zone else 'None'
+
+        return "Timestamp('%s', tz=%s)" % (result,zone)
 
     @property
     def _repr_base(self):