Neil Schemenauer | fd288c7 | 2001-01-02 16:30:31 +0000 | [diff] [blame] | 1 | import copy |
| 2 | import sys |
| 3 | |
| 4 | # Fake a number that implements numeric methods through __coerce__ |
| 5 | class CoerceNumber: |
| 6 | def __init__(self, arg): |
| 7 | self.arg = arg |
| 8 | |
| 9 | def __repr__(self): |
| 10 | return '<CoerceNumber %s>' % repr(self.arg) |
| 11 | |
| 12 | def __coerce__(self, other): |
| 13 | if isinstance(other, CoerceNumber): |
| 14 | return self.arg, other.arg |
| 15 | else: |
| 16 | return (self.arg, other) |
| 17 | |
| 18 | |
| 19 | # Fake a number that implements numeric ops through methods. |
| 20 | class MethodNumber: |
| 21 | |
| 22 | def __init__(self,arg): |
| 23 | self.arg = arg |
| 24 | |
| 25 | def __repr__(self): |
| 26 | return '<MethodNumber %s>' % repr(self.arg) |
| 27 | |
| 28 | def __add__(self,other): |
| 29 | return self.arg + other |
| 30 | |
| 31 | def __radd__(self,other): |
| 32 | return other + self.arg |
| 33 | |
| 34 | def __sub__(self,other): |
| 35 | return self.arg - other |
| 36 | |
| 37 | def __rsub__(self,other): |
| 38 | return other - self.arg |
| 39 | |
| 40 | def __mul__(self,other): |
| 41 | return self.arg * other |
| 42 | |
| 43 | def __rmul__(self,other): |
| 44 | return other * self.arg |
| 45 | |
| 46 | def __div__(self,other): |
| 47 | return self.arg / other |
| 48 | |
| 49 | def __rdiv__(self,other): |
| 50 | return other / self.arg |
| 51 | |
| 52 | def __pow__(self,other): |
| 53 | return self.arg ** other |
| 54 | |
| 55 | def __rpow__(self,other): |
| 56 | return other ** self.arg |
| 57 | |
| 58 | def __mod__(self,other): |
| 59 | return self.arg % other |
| 60 | |
| 61 | def __rmod__(self,other): |
| 62 | return other % self.arg |
| 63 | |
| 64 | def __cmp__(self, other): |
| 65 | return cmp(self.arg, other) |
| 66 | |
| 67 | |
Neil Schemenauer | 38796d0 | 2001-01-03 01:52:11 +0000 | [diff] [blame^] | 68 | candidates = [ 2, 4.0, 2L, 2+0j, [1], (2,), None, |
| 69 | MethodNumber(1), CoerceNumber(2)] |
Neil Schemenauer | fd288c7 | 2001-01-02 16:30:31 +0000 | [diff] [blame] | 70 | |
| 71 | infix_binops = [ '+', '-', '*', '/', '**', '%' ] |
| 72 | prefix_binops = [ 'divmod' ] |
| 73 | |
| 74 | def do_infix_binops(): |
| 75 | for a in candidates: |
| 76 | for b in candidates: |
| 77 | for op in infix_binops: |
| 78 | print '%s %s %s' % (a, op, b), |
| 79 | try: |
| 80 | x = eval('a %s b' % op) |
| 81 | except: |
| 82 | error = sys.exc_info()[:2] |
| 83 | print '... %s' % error[0] |
| 84 | else: |
| 85 | print '=', x |
| 86 | try: |
| 87 | z = copy.copy(a) |
| 88 | except copy.Error: |
| 89 | z = a # assume it has no inplace ops |
| 90 | print '%s %s= %s' % (a, op, b), |
| 91 | try: |
| 92 | exec('z %s= b' % op) |
| 93 | except: |
| 94 | error = sys.exc_info()[:2] |
| 95 | print '... %s' % error[0] |
| 96 | else: |
| 97 | print '=>', z |
| 98 | |
| 99 | def do_prefix_binops(): |
| 100 | for a in candidates: |
| 101 | for b in candidates: |
| 102 | for op in prefix_binops: |
| 103 | print '%s(%s, %s)' % (op, a, b), |
| 104 | try: |
| 105 | x = eval('%s(a, b)' % op) |
| 106 | except: |
| 107 | error = sys.exc_info()[:2] |
| 108 | print '... %s' % error[0] |
| 109 | else: |
| 110 | print '=', x |
| 111 | |
| 112 | do_infix_binops() |
| 113 | do_prefix_binops() |