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Make the Rational constructor accept '3.' and '.2' as well as '3.2'.

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This commit is contained in:
Mark Dickinson 2008-02-02 17:16:13 +00:00
parent 5a6cfee632
commit 1dabdb25f8
2 changed files with 18 additions and 3 deletions
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15
Lib/rational.py
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@ -25,9 +25,18 @@ def gcd(a, b):
return a
_RATIONAL_FORMAT = re.compile(
r'^\s*(?P<sign>[-+]?)(?P<num>\d+)'
r'(?:/(?P<denom>\d+)|\.(?P<decimal>\d+))?\s*$')
_RATIONAL_FORMAT = re.compile(r"""
\A\s* # optional whitespace at the start, then
(?P<sign>[-+]?) # an optional sign, then
(?=\d|\.\d) # lookahead for digit or .digit
(?P<num>\d*) # numerator (possibly empty)
(?: # followed by an optional
/(?P<denom>\d+) # / and denominator
| # or
\.(?P<decimal>\d*) # decimal point and fractional part
)?
\s*\Z # and optional whitespace to finish
""", re.VERBOSE)
class Rational(RationalAbc):