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114 lines
2.8 KiB
Python
114 lines
2.8 KiB
Python
import copy
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import sys
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# Fake a number that implements numeric methods through __coerce__
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class CoerceNumber:
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def __init__(self, arg):
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self.arg = arg
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def __repr__(self):
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return '<CoerceNumber %s>' % repr(self.arg)
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def __coerce__(self, other):
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if isinstance(other, CoerceNumber):
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return self.arg, other.arg
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else:
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return (self.arg, other)
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# Fake a number that implements numeric ops through methods.
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class MethodNumber:
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def __init__(self,arg):
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self.arg = arg
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def __repr__(self):
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return '<MethodNumber %s>' % repr(self.arg)
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def __add__(self,other):
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return self.arg + other
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def __radd__(self,other):
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return other + self.arg
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def __sub__(self,other):
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return self.arg - other
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def __rsub__(self,other):
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return other - self.arg
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def __mul__(self,other):
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return self.arg * other
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def __rmul__(self,other):
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return other * self.arg
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def __div__(self,other):
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return self.arg / other
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def __rdiv__(self,other):
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return other / self.arg
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def __pow__(self,other):
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return self.arg ** other
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def __rpow__(self,other):
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return other ** self.arg
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def __mod__(self,other):
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return self.arg % other
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def __rmod__(self,other):
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return other % self.arg
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def __cmp__(self, other):
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return cmp(self.arg, other)
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candidates = [ 2, 4.0, 2L, 2+0j, [1], (2,), None,
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MethodNumber(1), CoerceNumber(2)]
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infix_binops = [ '+', '-', '*', '/', '**', '%' ]
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prefix_binops = [ 'divmod' ]
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def do_infix_binops():
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for a in candidates:
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for b in candidates:
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for op in infix_binops:
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print '%s %s %s' % (a, op, b),
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try:
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x = eval('a %s b' % op)
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except:
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error = sys.exc_info()[:2]
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print '... %s' % error[0]
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else:
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print '=', x
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try:
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z = copy.copy(a)
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except copy.Error:
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z = a # assume it has no inplace ops
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print '%s %s= %s' % (a, op, b),
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try:
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exec('z %s= b' % op)
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except:
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error = sys.exc_info()[:2]
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print '... %s' % error[0]
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else:
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print '=>', z
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def do_prefix_binops():
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for a in candidates:
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for b in candidates:
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for op in prefix_binops:
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print '%s(%s, %s)' % (op, a, b),
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try:
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x = eval('%s(a, b)' % op)
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except:
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error = sys.exc_info()[:2]
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print '... %s' % error[0]
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else:
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print '=', x
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do_infix_binops()
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do_prefix_binops()
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