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cpython/Lib/test/test_coercion.py
Anthony Baxter 4ef3a23a35 whitespace normalisation
2006-03-30 12:59:11 +00:00

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import copy
import sys
import warnings
import unittest
from test.test_support import run_unittest
# Fake a number that implements numeric methods through __coerce__
class CoerceNumber:
def __init__(self, arg):
self.arg = arg
def __repr__(self):
return '<CoerceNumber %s>' % repr(self.arg)
def __coerce__(self, other):
if isinstance(other, CoerceNumber):
return self.arg, other.arg
else:
return (self.arg, other)
# New-style class version of CoerceNumber
class CoerceTo(object):
def __init__(self, arg):
self.arg = arg
def __coerce__(self, other):
if isinstance(other, CoerceTo):
return self.arg, other.arg
else:
return self.arg, other
# Fake a number that implements numeric ops through methods.
class MethodNumber:
def __init__(self,arg):
self.arg = arg
def __repr__(self):
return '<MethodNumber %s>' % repr(self.arg)
def __add__(self,other):
return self.arg + other
def __radd__(self,other):
return other + self.arg
def __sub__(self,other):
return self.arg - other
def __rsub__(self,other):
return other - self.arg
def __mul__(self,other):
return self.arg * other
def __rmul__(self,other):
return other * self.arg
def __div__(self,other):
return self.arg / other
def __rdiv__(self,other):
return other / self.arg
def __truediv__(self,other):
return self.arg / other
def __rtruediv__(self,other):
return other / self.arg
def __floordiv__(self,other):
return self.arg // other
def __rfloordiv__(self,other):
return other // self.arg
def __pow__(self,other):
return self.arg ** other
def __rpow__(self,other):
return other ** self.arg
def __mod__(self,other):
return self.arg % other
def __rmod__(self,other):
return other % self.arg
def __cmp__(self, other):
return cmp(self.arg, other)
candidates = [2, 2L, 4.0, 2+0j, [1], (2,), None,
MethodNumber(2), CoerceNumber(2)]
infix_binops = [ '+', '-', '*', '**', '%', '//', '/' ]
TE = TypeError
# b = both normal and augmented give same result list
# s = single result lists for normal and augmented
# e = equals other results
# result lists: ['+', '-', '*', '**', '%', '//', ('classic /', 'new /')]
# ^^^^^^^^^^^^^^^^^^^^^^
# 2-tuple if results differ
# else only one value
infix_results = {
# 2
(0,0): ('b', [4, 0, 4, 4, 0, 1, (1, 1.0)]),
(0,1): ('e', (0,0)),
(0,2): ('b', [6.0, -2.0, 8.0, 16.0, 2.0, 0.0, 0.5]),
(0,3): ('b', [4+0j, 0+0j, 4+0j, 4+0j, 0+0j, 1+0j, 1+0j]),
(0,4): ('b', [TE, TE, [1, 1], TE, TE, TE, TE]),
(0,5): ('b', [TE, TE, (2, 2), TE, TE, TE, TE]),
(0,6): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(0,7): ('e', (0,0)),
(0,8): ('e', (0,0)),
# 2L
(1,0): ('e', (0,0)),
(1,1): ('e', (0,1)),
(1,2): ('e', (0,2)),
(1,3): ('e', (0,3)),
(1,4): ('e', (0,4)),
(1,5): ('e', (0,5)),
(1,6): ('e', (0,6)),
(1,7): ('e', (0,7)),
(1,8): ('e', (0,8)),
# 4.0
(2,0): ('b', [6.0, 2.0, 8.0, 16.0, 0.0, 2.0, 2.0]),
(2,1): ('e', (2,0)),
(2,2): ('b', [8.0, 0.0, 16.0, 256.0, 0.0, 1.0, 1.0]),
(2,3): ('b', [6+0j, 2+0j, 8+0j, 16+0j, 0+0j, 2+0j, 2+0j]),
(2,4): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(2,5): ('e', (2,4)),
(2,6): ('e', (2,4)),
(2,7): ('e', (2,0)),
(2,8): ('e', (2,0)),
# (2+0j)
(3,0): ('b', [4+0j, 0+0j, 4+0j, 4+0j, 0+0j, 1+0j, 1+0j]),
(3,1): ('e', (3,0)),
(3,2): ('b', [6+0j, -2+0j, 8+0j, 16+0j, 2+0j, 0+0j, 0.5+0j]),
(3,3): ('b', [4+0j, 0+0j, 4+0j, 4+0j, 0+0j, 1+0j, 1+0j]),
(3,4): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(3,5): ('e', (3,4)),
(3,6): ('e', (3,4)),
(3,7): ('e', (3,0)),
(3,8): ('e', (3,0)),
# [1]
(4,0): ('b', [TE, TE, [1, 1], TE, TE, TE, TE]),
(4,1): ('e', (4,0)),
(4,2): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(4,3): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(4,4): ('b', [[1, 1], TE, TE, TE, TE, TE, TE]),
(4,5): ('s', [TE, TE, TE, TE, TE, TE, TE], [[1, 2], TE, TE, TE, TE, TE, TE]),
(4,6): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(4,7): ('e', (4,0)),
(4,8): ('e', (4,0)),
# (2,)
(5,0): ('b', [TE, TE, (2, 2), TE, TE, TE, TE]),
(5,1): ('e', (5,0)),
(5,2): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(5,3): ('e', (5,2)),
(5,4): ('e', (5,2)),
(5,5): ('b', [(2, 2), TE, TE, TE, TE, TE, TE]),
(5,6): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(5,7): ('e', (5,0)),
(5,8): ('e', (5,0)),
# None
(6,0): ('b', [TE, TE, TE, TE, TE, TE, TE]),
(6,1): ('e', (6,0)),
(6,2): ('e', (6,0)),
(6,3): ('e', (6,0)),
(6,4): ('e', (6,0)),
(6,5): ('e', (6,0)),
(6,6): ('e', (6,0)),
(6,7): ('e', (6,0)),
(6,8): ('e', (6,0)),
# MethodNumber(2)
(7,0): ('e', (0,0)),
(7,1): ('e', (0,1)),
(7,2): ('e', (0,2)),
(7,3): ('e', (0,3)),
(7,4): ('e', (0,4)),
(7,5): ('e', (0,5)),
(7,6): ('e', (0,6)),
(7,7): ('e', (0,7)),
(7,8): ('e', (0,8)),
# CoerceNumber(2)
(8,0): ('e', (0,0)),
(8,1): ('e', (0,1)),
(8,2): ('e', (0,2)),
(8,3): ('e', (0,3)),
(8,4): ('e', (0,4)),
(8,5): ('e', (0,5)),
(8,6): ('e', (0,6)),
(8,7): ('e', (0,7)),
(8,8): ('e', (0,8)),
}
def process_infix_results():
for key in sorted(infix_results):
val = infix_results[key]
if val[0] == 'e':
infix_results[key] = infix_results[val[1]]
else:
if val[0] == 's':
res = (val[1], val[2])
elif val[0] == 'b':
res = (val[1], val[1])
for i in range(1):
if isinstance(res[i][6], tuple):
if 1/2 == 0:
# testing with classic (floor) division
res[i][6] = res[i][6][0]
else:
# testing with -Qnew
res[i][6] = res[i][6][1]
infix_results[key] = res
process_infix_results()
# now infix_results has two lists of results for every pairing.
prefix_binops = [ 'divmod' ]
prefix_results = [
[(1,0), (1L,0L), (0.0,2.0), ((1+0j),0j), TE, TE, TE, TE, (1,0)],
[(1L,0L), (1L,0L), (0.0,2.0), ((1+0j),0j), TE, TE, TE, TE, (1L,0L)],
[(2.0,0.0), (2.0,0.0), (1.0,0.0), ((2+0j),0j), TE, TE, TE, TE, (2.0,0.0)],
[((1+0j),0j), ((1+0j),0j), (0j,(2+0j)), ((1+0j),0j), TE, TE, TE, TE, ((1+0j),0j)],
[TE, TE, TE, TE, TE, TE, TE, TE, TE],
[TE, TE, TE, TE, TE, TE, TE, TE, TE],
[TE, TE, TE, TE, TE, TE, TE, TE, TE],
[TE, TE, TE, TE, TE, TE, TE, TE, TE],
[(1,0), (1L,0L), (0.0,2.0), ((1+0j),0j), TE, TE, TE, TE, (1,0)]
]
def format_float(value):
if abs(value) < 0.01:
return '0.0'
else:
return '%.1f' % value
# avoid testing platform fp quirks
def format_result(value):
if isinstance(value, complex):
return '(%s + %sj)' % (format_float(value.real),
format_float(value.imag))
elif isinstance(value, float):
return format_float(value)
return str(value)
class CoercionTest(unittest.TestCase):
def test_infix_binops(self):
for ia, a in enumerate(candidates):
for ib, b in enumerate(candidates):
results = infix_results[(ia, ib)]
for op, res, ires in zip(infix_binops, results[0], results[1]):
if res is TE:
self.assertRaises(TypeError, eval,
'a %s b' % op, {'a': a, 'b': b})
else:
self.assertEquals(format_result(res),
format_result(eval('a %s b' % op)),
'%s %s %s == %s failed' % (a, op, b, res))
try:
z = copy.copy(a)
except copy.Error:
z = a # assume it has no inplace ops
if ires is TE:
try:
exec 'z %s= b' % op
except TypeError:
pass
else:
self.fail("TypeError not raised")
else:
exec('z %s= b' % op)
self.assertEquals(ires, z)
def test_prefix_binops(self):
for ia, a in enumerate(candidates):
for ib, b in enumerate(candidates):
for op in prefix_binops:
res = prefix_results[ia][ib]
if res is TE:
self.assertRaises(TypeError, eval,
'%s(a, b)' % op, {'a': a, 'b': b})
else:
self.assertEquals(format_result(res),
format_result(eval('%s(a, b)' % op)),
'%s(%s, %s) == %s failed' % (op, a, b, res))
def test_cmptypes(self):
# Built-in tp_compare slots expect their arguments to have the
# same type, but a user-defined __coerce__ doesn't have to obey.
# SF #980352
evil_coercer = CoerceTo(42)
# Make sure these don't crash any more
self.assertNotEquals(cmp(u'fish', evil_coercer), 0)
self.assertNotEquals(cmp(slice(1), evil_coercer), 0)
# ...but that this still works
class WackyComparer(object):
def __cmp__(slf, other):
self.assert_(other == 42, 'expected evil_coercer, got %r' % other)
return 0
self.assertEquals(cmp(WackyComparer(), evil_coercer), 0)
# ...and classic classes too, since that code path is a little different
class ClassicWackyComparer:
def __cmp__(slf, other):
self.assert_(other == 42, 'expected evil_coercer, got %r' % other)
return 0
self.assertEquals(cmp(ClassicWackyComparer(), evil_coercer), 0)
def test_main():
warnings.filterwarnings("ignore",
r'complex divmod\(\), // and % are deprecated',
DeprecationWarning,
r'test.test_coercion$')
run_unittest(CoercionTest)
if __name__ == "__main__":
test_main()
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