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-rw-r--r--Lib/copy.py77
1 files changed, 7 insertions, 70 deletions
diff --git a/Lib/copy.py b/Lib/copy.py
index 089d101..d96201e 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -173,8 +173,10 @@ def deepcopy(x, memo=None, _nil=[]):
"un(deep)copyable object of type %s" % cls)
y = _reconstruct(x, rv, 1, memo)
- memo[d] = y
- _keep_alive(x, memo) # Make sure x lives at least as long as d
+ # If is its own copy, don't memoize.
+ if y is not x:
+ memo[d] = y
+ _keep_alive(x, memo) # Make sure x lives at least as long as d
return y
_deepcopy_dispatch = d = {}
@@ -214,9 +216,10 @@ def _deepcopy_tuple(x, memo):
y = []
for a in x:
y.append(deepcopy(a, memo))
- d = id(x)
+ # We're not going to put the tuple in the memo, but it's still important we
+ # check for it, in case the tuple contains recursive mutable structures.
try:
- return memo[d]
+ return memo[id(x)]
except KeyError:
pass
for i in range(len(x)):
@@ -225,7 +228,6 @@ def _deepcopy_tuple(x, memo):
break
else:
y = x
- memo[d] = y
return y
d[tuple] = _deepcopy_tuple
@@ -321,68 +323,3 @@ del types
# Helper for instance creation without calling __init__
class _EmptyClass:
pass
-
-def _test():
- l = [None, 1, 2, 3.14, 'xyzzy', (1, 2), [3.14, 'abc'],
- {'abc': 'ABC'}, (), [], {}]
- l1 = copy(l)
- print(l1==l)
- l1 = map(copy, l)
- print(l1==l)
- l1 = deepcopy(l)
- print(l1==l)
- class C:
- def __init__(self, arg=None):
- self.a = 1
- self.arg = arg
- if __name__ == '__main__':
- import sys
- file = sys.argv[0]
- else:
- file = __file__
- self.fp = open(file)
- self.fp.close()
- def __getstate__(self):
- return {'a': self.a, 'arg': self.arg}
- def __setstate__(self, state):
- for key, value in state.items():
- setattr(self, key, value)
- def __deepcopy__(self, memo=None):
- new = self.__class__(deepcopy(self.arg, memo))
- new.a = self.a
- return new
- c = C('argument sketch')
- l.append(c)
- l2 = copy(l)
- print(l == l2)
- print(l)
- print(l2)
- l2 = deepcopy(l)
- print(l == l2)
- print(l)
- print(l2)
- l.append({l[1]: l, 'xyz': l[2]})
- l3 = copy(l)
- import reprlib
- print(map(reprlib.repr, l))
- print(map(reprlib.repr, l1))
- print(map(reprlib.repr, l2))
- print(map(reprlib.repr, l3))
- l3 = deepcopy(l)
- print(map(reprlib.repr, l))
- print(map(reprlib.repr, l1))
- print(map(reprlib.repr, l2))
- print(map(reprlib.repr, l3))
- class odict(dict):
- def __init__(self, d = {}):
- self.a = 99
- dict.__init__(self, d)
- def __setitem__(self, k, i):
- dict.__setitem__(self, k, i)
- self.a
- o = odict({"A" : "B"})
- x = deepcopy(o)
- print(o, x)
-
-if __name__ == '__main__':
- _test()