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- # Tests for rich comparisons
-
- from test_support import TestFailed, verify, verbose
-
- class Number:
-
- def __init__(self, x):
- self.x = x
-
- def __lt__(self, other):
- return self.x < other
-
- def __le__(self, other):
- return self.x <= other
-
- def __eq__(self, other):
- return self.x == other
-
- def __ne__(self, other):
- return self.x != other
-
- def __gt__(self, other):
- return self.x > other
-
- def __ge__(self, other):
- return self.x >= other
-
- def __cmp__(self, other):
- raise TestFailed, "Number.__cmp__() should not be called"
-
- def __repr__(self):
- return "Number(%s)" % repr(self.x)
-
- class Vector:
-
- def __init__(self, data):
- self.data = data
-
- def __len__(self):
- return len(self.data)
-
- def __getitem__(self, i):
- return self.data[i]
-
- def __setitem__(self, i, v):
- self.data[i] = v
-
- def __hash__(self):
- raise TypeError, "Vectors cannot be hashed"
-
- def __nonzero__(self):
- raise TypeError, "Vectors cannot be used in Boolean contexts"
-
- def __cmp__(self, other):
- raise TestFailed, "Vector.__cmp__() should not be called"
-
- def __repr__(self):
- return "Vector(%s)" % repr(self.data)
-
- def __lt__(self, other):
- return Vector([a < b for a, b in zip(self.data, self.__cast(other))])
-
- def __le__(self, other):
- return Vector([a <= b for a, b in zip(self.data, self.__cast(other))])
-
- def __eq__(self, other):
- return Vector([a == b for a, b in zip(self.data, self.__cast(other))])
-
- def __ne__(self, other):
- return Vector([a != b for a, b in zip(self.data, self.__cast(other))])
-
- def __gt__(self, other):
- return Vector([a > b for a, b in zip(self.data, self.__cast(other))])
-
- def __ge__(self, other):
- return Vector([a >= b for a, b in zip(self.data, self.__cast(other))])
-
- def __cast(self, other):
- if isinstance(other, Vector):
- other = other.data
- if len(self.data) != len(other):
- raise ValueError, "Cannot compare vectors of different length"
- return other
-
- operators = "<", "<=", "==", "!=", ">", ">="
- opmap = {}
- for op in operators:
- opmap[op] = eval("lambda a, b: a %s b" % op)
-
- def testvector():
- a = Vector(range(2))
- b = Vector(range(3))
- for op in operators:
- try:
- opmap[op](a, b)
- except ValueError:
- pass
- else:
- raise TestFailed, "a %s b for different length should fail" % op
- a = Vector(range(5))
- b = Vector(5 * [2])
- for op in operators:
- print "%23s %-2s %-23s -> %s" % (a, op, b, opmap[op](a, b))
- print "%23s %-2s %-23s -> %s" % (a, op, b.data, opmap[op](a, b.data))
- print "%23s %-2s %-23s -> %s" % (a.data, op, b, opmap[op](a.data, b))
- try:
- if opmap[op](a, b):
- raise TestFailed, "a %s b shouldn't be true" % op
- else:
- raise TestFailed, "a %s b shouldn't be false" % op
- except TypeError:
- pass
-
- def testop(a, b, op):
- try:
- ax = a.x
- except AttributeError:
- ax = a
- try:
- bx = b.x
- except AttributeError:
- bx = b
- opfunc = opmap[op]
- realoutcome = opfunc(ax, bx)
- testoutcome = opfunc(a, b)
- if realoutcome != testoutcome:
- print "Error for", a, op, b, ": expected", realoutcome,
- print "but got", testoutcome
- ## else:
- ## print a, op, b, "-->", testoutcome # and "true" or "false"
-
- def testit(a, b):
- testop(a, b, "<")
- testop(a, b, "<=")
- testop(a, b, "==")
- testop(a, b, "!=")
- testop(a, b, ">")
- testop(a, b, ">=")
-
- def basic():
- for a in range(3):
- for b in range(3):
- testit(Number(a), Number(b))
- testit(a, Number(b))
- testit(Number(a), b)
-
- def tabulate(c1=Number, c2=Number):
- for op in operators:
- opfunc = opmap[op]
- print
- print "operator:", op
- print
- print "%9s" % "",
- for b in range(3):
- b = c2(b)
- print "| %9s" % b,
- print "|"
- print '----------+-' * 4
- for a in range(3):
- a = c1(a)
- print "%9s" % a,
- for b in range(3):
- b = c2(b)
- print "| %9s" % opfunc(a, b),
- print "|"
- print '----------+-' * 4
- print
- print '*' * 50
-
- def misbehavin():
- class Misb:
- def __lt__(self, other): return 0
- def __gt__(self, other): return 0
- def __eq__(self, other): return 0
- def __le__(self, other): raise TestFailed, "This shouldn't happen"
- def __ge__(self, other): raise TestFailed, "This shouldn't happen"
- def __ne__(self, other): raise TestFailed, "This shouldn't happen"
- def __cmp__(self, other): raise RuntimeError, "expected"
- a = Misb()
- b = Misb()
- verify((a<b) == 0)
- verify((a==b) == 0)
- verify((a>b) == 0)
- try:
- print cmp(a, b)
- except RuntimeError:
- pass
- else:
- raise TestFailed, "cmp(Misb(), Misb()) didn't raise RuntimeError"
-
- def recursion():
- from UserList import UserList
- a = UserList(); a.append(a)
- b = UserList(); b.append(b)
- def check(s, a=a, b=b):
- if verbose:
- print "check", s
- try:
- if not eval(s):
- raise TestFailed, s + " was false but expected to be true"
- except RuntimeError, msg:
- raise TestFailed, str(msg)
- if verbose:
- print "recursion tests: a=%s, b=%s" % (a, b)
- check('a==b')
- check('not a!=b')
- a.append(1)
- if verbose:
- print "recursion tests: a=%s, b=%s" % (a, b)
- check('a!=b')
- check('not a==b')
- b.append(0)
- if verbose:
- print "recursion tests: a=%s, b=%s" % (a, b)
- check('a!=b')
- check('not a==b')
- a[1] = -1
- if verbose:
- print "recursion tests: a=%s, b=%s" % (a, b)
- check('a!=b')
- check('not a==b')
- if verbose: print "recursion tests ok"
-
- def dicts():
- # Verify that __eq__ and __ne__ work for dicts even if the keys and
- # values don't support anything other than __eq__ and __ne__. Complex
- # numbers are a fine example of that.
- import random
- imag1a = {}
- for i in range(50):
- imag1a[random.randrange(100)*1j] = random.randrange(100)*1j
- items = imag1a.items()
- random.shuffle(items)
- imag1b = {}
- for k, v in items:
- imag1b[k] = v
- imag2 = imag1b.copy()
- imag2[k] = v + 1.0
- verify(imag1a == imag1a, "imag1a == imag1a should have worked")
- verify(imag1a == imag1b, "imag1a == imag1b should have worked")
- verify(imag2 == imag2, "imag2 == imag2 should have worked")
- verify(imag1a != imag2, "imag1a != imag2 should have worked")
- for op in "<", "<=", ">", ">=":
- try:
- eval("imag1a %s imag2" % op)
- except TypeError:
- pass
- else:
- raise TestFailed("expected TypeError from imag1a %s imag2" % op)
-
- def main():
- basic()
- tabulate()
- tabulate(c1=int)
- tabulate(c2=int)
- testvector()
- misbehavin()
- recursion()
- dicts()
-
- main()
-