[Python-checkins] r60530 - in python/trunk/Lib: rational.py test/test_rational.py
mark.dickinson
python-checkins at python.org
Sat Feb 2 18:16:13 CET 2008
Author: mark.dickinson
Date: Sat Feb 2 18:16:13 2008
New Revision: 60530
Modified:
python/trunk/Lib/rational.py
python/trunk/Lib/test/test_rational.py
Log:
Make the Rational constructor accept '3.' and '.2' as well as '3.2'.
Modified: python/trunk/Lib/rational.py
==============================================================================
--- python/trunk/Lib/rational.py (original)
+++ python/trunk/Lib/rational.py Sat Feb 2 18:16:13 2008
@@ -25,9 +25,18 @@
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):
Modified: python/trunk/Lib/test/test_rational.py
==============================================================================
--- python/trunk/Lib/test/test_rational.py (original)
+++ python/trunk/Lib/test/test_rational.py Sat Feb 2 18:16:13 2008
@@ -78,6 +78,8 @@
self.assertEquals((16, 5), _components(R(" 3.2 ")))
self.assertEquals((-16, 5), _components(R(u" -3.2 ")))
+ self.assertEquals((-3, 1), _components(R(u" -3. ")))
+ self.assertEquals((3, 5), _components(R(u" .6 ")))
self.assertRaisesMessage(
@@ -113,6 +115,10 @@
# Don't accept combinations of decimals and rationals.
ValueError, "Invalid literal for Rational: 3.2/7",
R, "3.2/7")
+ self.assertRaisesMessage(
+ # Allow 3. and .3, but not .
+ ValueError, "Invalid literal for Rational: .",
+ R, ".")
def testImmutable(self):
r = R(7, 3)
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