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Issue #7233: Fix Decimal.shift and Decimal.rotate methods for

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arguments with more digits than the current context precision.
Bug reported by Stefan Krah.
This commit is contained in:
Mark Dickinson 2009-10-29 12:11:18 +00:00
parent 0c67312c5c
commit 6f3900163a
3 changed files with 43 additions and 10 deletions
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18
Lib/decimal.py
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@ -3439,8 +3439,10 @@ class Decimal(object):
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 @@ class Decimal(object):
# 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):