234 lines
6.1 KiB
Python
234 lines
6.1 KiB
Python
# Tests for rich comparisons
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from test_support import TestFailed, verify, verbose
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class Number:
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def __init__(self, x):
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self.x = x
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def __lt__(self, other):
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return self.x < other
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def __le__(self, other):
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return self.x <= other
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def __eq__(self, other):
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return self.x == other
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def __ne__(self, other):
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return self.x != other
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def __gt__(self, other):
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return self.x > other
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def __ge__(self, other):
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return self.x >= other
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def __cmp__(self, other):
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raise TestFailed, "Number.__cmp__() should not be called"
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def __repr__(self):
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return "Number(%s)" % repr(self.x)
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class Vector:
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def __init__(self, data):
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self.data = data
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def __len__(self):
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return len(self.data)
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def __getitem__(self, i):
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return self.data[i]
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def __setitem__(self, i, v):
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self.data[i] = v
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def __hash__(self):
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raise TypeError, "Vectors cannot be hashed"
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def __nonzero__(self):
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raise TypeError, "Vectors cannot be used in Boolean contexts"
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def __cmp__(self, other):
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raise TestFailed, "Vector.__cmp__() should not be called"
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def __repr__(self):
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return "Vector(%s)" % repr(self.data)
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def __lt__(self, other):
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return Vector([a < b for a, b in zip(self.data, self.__cast(other))])
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def __le__(self, other):
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return Vector([a <= b for a, b in zip(self.data, self.__cast(other))])
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def __eq__(self, other):
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return Vector([a == b for a, b in zip(self.data, self.__cast(other))])
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def __ne__(self, other):
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return Vector([a != b for a, b in zip(self.data, self.__cast(other))])
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def __gt__(self, other):
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return Vector([a > b for a, b in zip(self.data, self.__cast(other))])
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def __ge__(self, other):
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return Vector([a >= b for a, b in zip(self.data, self.__cast(other))])
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def __cast(self, other):
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if isinstance(other, Vector):
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other = other.data
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if len(self.data) != len(other):
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raise ValueError, "Cannot compare vectors of different length"
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return other
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operators = "<", "<=", "==", "!=", ">", ">="
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opmap = {}
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for op in operators:
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opmap[op] = eval("lambda a, b: a %s b" % op)
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def testvector():
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a = Vector(range(2))
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b = Vector(range(3))
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for op in operators:
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try:
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opmap[op](a, b)
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except ValueError:
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pass
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else:
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raise TestFailed, "a %s b for different length should fail" % op
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a = Vector(range(5))
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b = Vector(5 * [2])
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for op in operators:
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print "%23s %-2s %-23s -> %s" % (a, op, b, opmap[op](a, b))
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print "%23s %-2s %-23s -> %s" % (a, op, b.data, opmap[op](a, b.data))
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print "%23s %-2s %-23s -> %s" % (a.data, op, b, opmap[op](a.data, b))
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try:
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if opmap[op](a, b):
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raise TestFailed, "a %s b shouldn't be true" % op
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else:
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raise TestFailed, "a %s b shouldn't be false" % op
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except TypeError:
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pass
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def testop(a, b, op):
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try:
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ax = a.x
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except AttributeError:
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ax = a
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try:
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bx = b.x
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except AttributeError:
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bx = b
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opfunc = opmap[op]
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realoutcome = opfunc(ax, bx)
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testoutcome = opfunc(a, b)
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if realoutcome != testoutcome:
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print "Error for", a, op, b, ": expected", realoutcome,
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print "but got", testoutcome
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## else:
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## print a, op, b, "-->", testoutcome # and "true" or "false"
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def testit(a, b):
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testop(a, b, "<")
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testop(a, b, "<=")
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testop(a, b, "==")
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testop(a, b, "!=")
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testop(a, b, ">")
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testop(a, b, ">=")
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def basic():
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for a in range(3):
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for b in range(3):
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testit(Number(a), Number(b))
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testit(a, Number(b))
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testit(Number(a), b)
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def tabulate(c1=Number, c2=Number):
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for op in operators:
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opfunc = opmap[op]
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print
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print "operator:", op
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print
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print "%9s" % "",
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for b in range(3):
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b = c2(b)
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print "| %9s" % b,
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print "|"
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print '----------+-' * 4
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for a in range(3):
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a = c1(a)
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print "%9s" % a,
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for b in range(3):
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b = c2(b)
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print "| %9s" % opfunc(a, b),
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print "|"
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print '----------+-' * 4
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print
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print '*' * 50
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def misbehavin():
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class Misb:
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def __lt__(self, other): return 0
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def __gt__(self, other): return 0
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def __eq__(self, other): return 0
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def __le__(self, other): raise TestFailed, "This shouldn't happen"
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def __ge__(self, other): raise TestFailed, "This shouldn't happen"
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def __ne__(self, other): raise TestFailed, "This shouldn't happen"
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def __cmp__(self, other): raise RuntimeError, "expected"
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a = Misb()
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b = Misb()
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verify((a<b) == 0)
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verify((a==b) == 0)
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verify((a>b) == 0)
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try:
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print cmp(a, b)
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except RuntimeError:
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pass
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else:
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raise TestFailed, "cmp(Misb(), Misb()) didn't raise RuntimeError"
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def recursion():
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from UserList import UserList
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a = UserList(); a.append(a)
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b = UserList(); b.append(b)
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def check(s, a=a, b=b):
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if verbose:
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print "check", s
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try:
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if not eval(s):
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raise TestFailed, s + " was false but expected to be true"
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except RuntimeError, msg:
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raise TestFailed, str(msg)
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if verbose:
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print "recursion tests: a=%s, b=%s" % (a, b)
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check('a==b')
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check('not a!=b')
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a.append(1)
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if verbose:
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print "recursion tests: a=%s, b=%s" % (a, b)
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check('a!=b')
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check('not a==b')
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b.append(0)
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if verbose:
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print "recursion tests: a=%s, b=%s" % (a, b)
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check('a!=b')
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check('not a==b')
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a[1] = -1
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if verbose:
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print "recursion tests: a=%s, b=%s" % (a, b)
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check('a!=b')
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check('not a==b')
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if verbose: print "recursion tests ok"
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def main():
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basic()
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tabulate()
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tabulate(c1=int)
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tabulate(c2=int)
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testvector()
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misbehavin()
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recursion()
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main()
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