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authorGuido van Rossum <guido@python.org>2001-08-30 20:06:08 (GMT)
committerGuido van Rossum <guido@python.org>2001-08-30 20:06:08 (GMT)
commitcaa9f4377973afcf36265306fbe0816879802a35 (patch)
tree85b8419f3bdb9c62ba8091e85ec86a10bfff120b
parent6fb3fdec7c3aa9cbda9176f88076e5bee4743834 (diff)
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Add testcases for inheritance from tricky builtins (numbers, strings,
tuples).
-rw-r--r--Lib/test/test_descr.py74
1 files changed, 74 insertions, 0 deletions
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 54b03b2..ec966a1 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1120,6 +1120,79 @@ def supers():
verify (D().meth(4) == "D(4)C(4)B(4)A(4)")
+def inherits():
+ if verbose: print "Testing inheritance from basic types..."
+
+ class hexint(int):
+ def __repr__(self):
+ return hex(self)
+ def __add__(self, other):
+ return hexint(int.__add__(self, other))
+ # (Note that overriding __radd__ doesn't work,
+ # because the int type gets first dibs.)
+ verify(repr(hexint(7) + 9) == "0x10")
+ verify(repr(hexint(1000) + 7) == "0x3ef")
+
+ class octlong(long):
+ __slots__ = []
+ def __str__(self):
+ s = oct(self)
+ if s[-1] == 'L':
+ s = s[:-1]
+ return s
+ def __add__(self, other):
+ return self.__class__(super(octlong, self).__add__(other))
+ __radd__ = __add__
+ verify(str(octlong(3) + 5) == "010")
+ # (Note that overriding __radd__ here only seems to work
+ # because the example uses a short int left argument.)
+ verify(str(5 + octlong(3000)) == "05675")
+
+ class precfloat(float):
+ __slots__ = ['prec']
+ def __init__(self, value=0.0, prec=12):
+ self.prec = int(prec)
+ float.__init__(value)
+ def __repr__(self):
+ return "%.*g" % (self.prec, self)
+ verify(repr(precfloat(1.1)) == "1.1")
+
+ class madtuple(tuple):
+ _rev = None
+ def rev(self):
+ if self._rev is not None:
+ return self._rev
+ L = list(self)
+ L.reverse()
+ self._rev = self.__class__(L)
+ return self._rev
+ a = madtuple((1,2,3,4,5,6,7,8,9,0))
+ verify(a.rev() == madtuple((0,9,8,7,6,5,4,3,2,1)))
+ verify(a.rev().rev() == madtuple((1,2,3,4,5,6,7,8,9,0)))
+ for i in range(512):
+ t = madtuple(range(i))
+ u = t.rev()
+ v = u.rev()
+ verify(v == t)
+
+ class madstring(str):
+ _rev = None
+ def rev(self):
+ if self._rev is not None:
+ return self._rev
+ L = list(self)
+ L.reverse()
+ self._rev = self.__class__("".join(L))
+ return self._rev
+ s = madstring("abcdefghijklmnopqrstuvwxyz")
+ verify(s.rev() == madstring("zyxwvutsrqponmlkjihgfedcba"))
+ verify(s.rev().rev() == madstring("abcdefghijklmnopqrstuvwxyz"))
+ for i in range(256):
+ s = madstring("".join(map(chr, range(i))))
+ t = s.rev()
+ u = t.rev()
+ verify(u == s)
+
def all():
lists()
dicts()
@@ -1151,6 +1224,7 @@ def all():
weakrefs()
getsets()
supers()
+ inherits()
all()