ENH: better repr for weekly Periods, close #1503

Author: wesm

RELEASE.rst

@@ -51,6 +51,7 @@ pandas 0.8.1
   - Cleaner DatetimeIndex string representation with 1 or 2 elements (#1611)
   - Improve performance of array-of-Period to PeriodIndex, convert such arrays
     to PeriodIndex inside Index (#1215)
+  - More informative string representation for weekly Period objects (#1503)
 
 **Bug fixes**
 
@@ -77,6 +78,7 @@ pandas 0.8.1
   - Fix DatetimeIndex intersection logic error with irregular indexes (#1551)
   - Fix unit test errors on Python 3 (#1550)
   - Fix .ix indexing bugs in duplicate DataFrame index (#1201)
+  - Better handle errors with non-existing objects in HDFStore (#1254)
 
 pandas 0.8.0
 ============

pandas/src/plib.pyx

@@ -231,8 +231,12 @@ def period_format(int64_t value, int freq, object fmt=None):
             fmt = b'%FQ%q'
         elif freq_group == 3000: # FR_MTH
             fmt = b'%b-%Y'
-        elif (freq_group == 4000 # WK
-              or freq_group == 5000 # BUS
+        elif freq_group == 4000: # WK
+            left = period_asfreq(value, freq, 6000, 0)
+            right = period_asfreq(value, freq, 6000, 1)
+            return '%s/%s' % (period_format(left, 6000),
+                              period_format(right, 6000))
+        elif (freq_group == 5000 # BUS
               or freq_group == 6000): # DAY
             fmt = b'%d-%b-%Y'
         elif freq_group == 7000: # HR