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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 main():
basic()
tabulate()
tabulate(c1=int)
tabulate(c2=int)
testvector()
misbehavin()
recursion()
main()
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