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Raymond Hettinger 2008-01-25 01:46:33 +00:00
parent 9c6d81f5dd
commit 9ec7bc36fe
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Lib/rational.py
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@ -82,6 +82,10 @@ def _binary_float_to_ratio(x):
_RATIONAL_FORMAT = re.compile( _RATIONAL_FORMAT = re.compile(
r'^\s*(?P<sign>[-+]?)(?P<num>\d+)(?:/(?P<denom>\d+))?\s*$') r'^\s*(?P<sign>[-+]?)(?P<num>\d+)(?:/(?P<denom>\d+))?\s*$')
# XXX Consider accepting decimal strings as input since they are exact.
# Rational("2.01") --> s="2.01" ; Rational.from_decimal(Decimal(s)) --> Rational(201, 100)"
# If you want to avoid going through the decimal module, just parse the string directly:
# s.partition('.') --> ('2', '.', '01') --> Rational(int('2'+'01'), 10**len('01')) --> Rational(201, 100)
class Rational(RationalAbc): class Rational(RationalAbc):
"""This class implements rational numbers. """This class implements rational numbers.