Issue #5812: Make Fraction('1e6') valid. The Fraction constructor now

accepts all strings accepted by the float and Decimal constructors,
with the exception of strings representing NaNs or infinities.

1 files changed, 8 insertions, 4 deletions

diff --git a/Lib/test/test_fractions.py b/Lib/test/test_fractions.py
index 91fcd26d5c..448e32da53 100644
--- a/Lib/test/test_fractions.py
+++ b/Lib/test/test_fractions.py
@@ -78,6 +78,11 @@ class FractionTest(unittest.TestCase):
         self.assertEquals((-16, 5), _components(F(" -3.2 ")))
         self.assertEquals((-3, 1), _components(F(" -3. ")))
         self.assertEquals((3, 5), _components(F(" .6 ")))
+        self.assertEquals((1, 3125), _components(F("32.e-5")))
+        self.assertEquals((1000000, 1), _components(F("1E+06")))
+        self.assertEquals((-12300, 1), _components(F("-1.23e4")))
+        self.assertEquals((0, 1), _components(F(" .0e+0\t")))
+        self.assertEquals((0, 1), _components(F("-0.000e0")))
 
         self.assertRaisesMessage(
             ZeroDivisionError, "Fraction(3, 0)",
@@ -86,6 +91,9 @@ class FractionTest(unittest.TestCase):
             ValueError, "Invalid literal for Fraction: '3/'",
             F, "3/")
         self.assertRaisesMessage(
+            ValueError, "Invalid literal for Fraction: '/2'",
+            F, "/2")
+        self.assertRaisesMessage(
             ValueError, "Invalid literal for Fraction: '3 /2'",
             F, "3 /2")
         self.assertRaisesMessage(
@@ -101,10 +109,6 @@ class FractionTest(unittest.TestCase):
             ValueError, "Invalid literal for Fraction: '3a2'",
             F, "3a2")
         self.assertRaisesMessage(
-            # Only parse ordinary decimals, not scientific form.
-            ValueError, "Invalid literal for Fraction: '3.2e4'",
-            F, "3.2e4")
-        self.assertRaisesMessage(
             # Don't accept combinations of decimals and rationals.
             ValueError, "Invalid literal for Fraction: '3/7.2'",
             F, "3/7.2")