Issue #7233: Fix Decimal.shift and Decimal.rotate methods for
arguments with more digits than the current context precision.
Bug reported by Stefan Krah.
diff --git a/Lib/decimal.py b/Lib/decimal.py
index be1a827..8393365 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -3439,8 +3439,10 @@
torot = int(other)
rotdig = self._int
topad = context.prec - len(rotdig)
- if topad:
+ if topad > 0:
rotdig = '0'*topad + rotdig
+ elif topad < 0:
+ rotdig = rotdig[-topad:]
# let's rotate!
rotated = rotdig[torot:] + rotdig[:torot]
@@ -3493,22 +3495,22 @@
# get values, pad if necessary
torot = int(other)
- if not torot:
- return Decimal(self)
rotdig = self._int
topad = context.prec - len(rotdig)
- if topad:
+ if topad > 0:
rotdig = '0'*topad + rotdig
+ elif topad < 0:
+ rotdig = rotdig[-topad:]
# let's shift!
if torot < 0:
- rotated = rotdig[:torot]
+ shifted = rotdig[:torot]
else:
- rotated = rotdig + '0'*torot
- rotated = rotated[-context.prec:]
+ shifted = rotdig + '0'*torot
+ shifted = shifted[-context.prec:]
return _dec_from_triple(self._sign,
- rotated.lstrip('0') or '0', self._exp)
+ shifted.lstrip('0') or '0', self._exp)
# Support for pickling, copy, and deepcopy
def __reduce__(self):