The following small program is giving me some unexpected results with
Python 2.2.1:
class Int(object):
def __int__(self): return 10
class Float(object):
def __float__(self): return 10.0
class Long(object):
def __long__(self): return 10L
class Complex(object):
def __complex__(self): return (10+0j)
def attempt(f,arg):
try:
return f(arg)
except Exception,e:
return str(e.__class__.__name__)+': '+str(e)
for f in int,float,long,complex:
for t in Int,Float,Long,Complex:
print f.__name__ + '(' + t.__name__ + ')\t\t',
print attempt(f,t())
----- results ------
int(Int) 10
int(Float) TypeError: object can't be converted to int
int(Long) TypeError: object can't be converted to int
int(Complex) TypeError: object can't be converted to int
*** OK, int() seems to work as expected
float(Int) TypeError: float() needs a string argument
float(Float) 10.0
float(Long) TypeError: float() needs a string argument
float(Complex) TypeError: float() needs a string argument
*** float() seems to work, but what's with the error message about strings?
long(Int) TypeError: object can't be converted to long
long(Float) TypeError: object can't be converted to long
long(Long) 10
long(Complex) TypeError: object can't be converted to long
**** OK, long seems to work as expected
complex(Int) TypeError: complex() arg can't be converted to
complex
complex(Float) (10+0j)
complex(Long) TypeError: complex() arg can't be converted to
complex
complex(Complex) TypeError: complex() arg can't be converted to
complex
**** I can understand complex() handling Float implicitly, but only if it
also handles Complex! And if it does handle Float implicitly, shouldn't all
of these handle everything?
Comments?
-Dave
+---------------------------------------------------------------+
David Abrahams
C++ Booster (http://www.boost.org) O__ ==
Pythonista (http://www.python.org) c/ /'_ ==
resume: http://users.rcn.com/abrahams/resume.html (*) \(*) ==
email: david.abrahams@rcn.com
+---------------------------------------------------------------+
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