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Tim gets his default traps.

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Raymond Hettinger 2004-07-08 00:49:18 +00:00
parent 4e0e1b6a54
commit bd7f76dd04
1 changed files with 10 additions and 8 deletions
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18
Lib/decimal.py
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@ -31,7 +31,7 @@ of the expected Decimal("0.00") returned by decimal floating point).
Here are some examples of using the decimal module: Here are some examples of using the decimal module:
>>> from decimal import * >>> from decimal import *
>>> getcontext().prec=9 >>> setcontext(ExtendedContext)
>>> Decimal(0) >>> Decimal(0)
Decimal("0") Decimal("0")
>>> Decimal("1") >>> Decimal("1")
@ -405,8 +405,8 @@ if hasattr(threading.currentThread(), '__decimal_context__'):
def setcontext(context): def setcontext(context):
"""Set this thread's context to context.""" """Set this thread's context to context."""
if context == DefaultContext: if context in (DefaultContext, BasicContext, ExtendedContext):
context = Context() context = context.copy()
threading.currentThread().__decimal_context__ = context threading.currentThread().__decimal_context__ = context
def getcontext(): def getcontext():
@ -2960,28 +2960,30 @@ def _isnan(num):
##### Setup Specific Contexts ################################ ##### Setup Specific Contexts ################################
_basic_traps = dict.fromkeys(Signals, 1)
_basic_traps.update({Inexact:0, Rounded:0, Subnormal:0})
# The default context prototype used by Context() # The default context prototype used by Context()
# Is mutable, so than new contexts can have different default values # Is mutable, so than new contexts can have different default values
_default_traps = dict.fromkeys(Signals, 0)
_default_traps.update({DivisionByZero:1, Overflow:1, InvalidOperation:1})
DefaultContext = Context( DefaultContext = Context(
prec=28, rounding=ROUND_HALF_EVEN, prec=28, rounding=ROUND_HALF_EVEN,
trap_enablers=dict.fromkeys(Signals, 0), trap_enablers=_default_traps,
flags=None, flags=None,
_rounding_decision=ALWAYS_ROUND, _rounding_decision=ALWAYS_ROUND,
Emax=DEFAULT_MAX_EXPONENT, Emax=DEFAULT_MAX_EXPONENT,
Emin=DEFAULT_MIN_EXPONENT, Emin=DEFAULT_MIN_EXPONENT,
capitals=1 capitals=1
) )
DefaultContext.trap_enablers.update({ConversionSyntax : 1})
# Pre-made alternate contexts offered by the specification # Pre-made alternate contexts offered by the specification
# Don't change these; the user should be able to select these # Don't change these; the user should be able to select these
# contexts and be able to reproduce results from other implementations # contexts and be able to reproduce results from other implementations
# of the spec. # of the spec.
_basic_traps = dict.fromkeys(Signals, 1)
_basic_traps.update({Inexact:0, Rounded:0, Subnormal:0})
BasicContext = Context( BasicContext = Context(
prec=9, rounding=ROUND_HALF_UP, prec=9, rounding=ROUND_HALF_UP,
trap_enablers=_basic_traps, trap_enablers=_basic_traps,