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| author | Guido van Rossum <guido@python.org> | 1993-10-27 09:28:23 (GMT) |
|---|---|---|
| committer | Guido van Rossum <guido@python.org> | 1993-10-27 09:28:23 (GMT) |
| commit | f1bbf9c308885648c2ecce611e975d21f220edf3 (patch) | |
| tree | d6e6b2c6f4540ad15896c1a74e8e8ef8c7950312 | |
| parent | b6957e434fab0b901cb2c8fafeba77f9ae7a653f (diff) | |
| download | cpython-f1bbf9c308885648c2ecce611e975d21f220edf3.zip cpython-f1bbf9c308885648c2ecce611e975d21f220edf3.tar.gz cpython-f1bbf9c308885648c2ecce611e975d21f220edf3.tar.bz2 | |
Add coercions
| -rwxr-xr-x | Demo/classes/Rat.py | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/Demo/classes/Rat.py b/Demo/classes/Rat.py index 0b2519d..0d3e515 100755 --- a/Demo/classes/Rat.py +++ b/Demo/classes/Rat.py @@ -52,12 +52,18 @@ class Rat: raise TypeError, 'Rat.__coerce__: bad other arg' def __add__(a, b): + if type(b) <> type(a): + a, b = a.__coerce__(b) + return a + b return rat(a.num*b.den + b.num*a.den, a.den*b.den) def __sub__(a, b): return rat(a.num*b.den - b.num*a.den, a.den*b.den) def __mul__(a, b): + if type(b) <> type(a): + a, b = a.__coerce__(b) + return a * b return rat(a.num*b.num, a.den*b.den) def __div__(a, b): @@ -78,9 +84,13 @@ def test(): l.sort() print l print rat(0, 1) - print rat(1, 0) print a+1 print a+1L print a+1.0 + try: + print rat(1, 0) + raise SystemError, 'should have been ZeroDivisionError' + except ZeroDivisionError: + print 'OK' -test() +#test() |