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Make decimal.ContextManager a private implementation detail of decimal.localcontext()

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This commit is contained in:
Nick Coghlan 2006-09-02 03:54:17 +00:00
parent 69e8897505
commit ced1218dd1
2 changed files with 7 additions and 37 deletions
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29
Lib/decimal.py
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@ -130,9 +130,6 @@ __all__ = [
'ROUND_DOWN', 'ROUND_HALF_UP', 'ROUND_HALF_EVEN', 'ROUND_CEILING',
'ROUND_FLOOR', 'ROUND_UP', 'ROUND_HALF_DOWN',
# helper for context management
'ContextManager',
# Functions for manipulating contexts
'setcontext', 'getcontext', 'localcontext'
]
@ -501,8 +498,8 @@ def localcontext(ctx=None):
>>> print getcontext().prec
28
"""
if ctx is None: ctx = getcontext().copy()
return ContextManager(ctx.copy())
if ctx is None: ctx = getcontext()
return _ContextManager(ctx)
##### Decimal class ###########################################
@ -2219,30 +2216,14 @@ for name in rounding_functions:
del name, val, globalname, rounding_functions
class ContextManager(object):
class _ContextManager(object):
"""Context manager class to support localcontext().
Sets the supplied context in __enter__() and restores
Sets a copy of the supplied context in __enter__() and restores
the previous decimal context in __exit__()
"""
# The below can't be included in the docstring until Python 2.6
# as the doctest module doesn't understand __future__ statements
"""
Sample usage:
>>> from __future__ import with_statement
>>> print getcontext().prec
28
>>> ctx = Context(prec=15)
>>> with ContextManager(ctx):
... print getcontext().prec
...
15
>>> print getcontext().prec
28
"""
def __init__(self, new_context):
self.new_context = new_context
self.new_context = new_context.copy()
def __enter__(self):
self.saved_context = getcontext()
setcontext(self.new_context)