diff options
| -rw-r--r-- | Lib/copy.py | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/Lib/copy.py b/Lib/copy.py index 15e0e40..6dc781c 100644 --- a/Lib/copy.py +++ b/Lib/copy.py @@ -25,19 +25,19 @@ class instances). Two problems often exist with deep copy operations that don't exist with shallow copy operations: -(a) recursive objects (compound objects that, directly or indirectly, + a) recursive objects (compound objects that, directly or indirectly, contain a reference to themselves) may cause a recursive loop -(b) because deep copy copies *everything* it may copy too much, e.g. + b) because deep copy copies *everything* it may copy too much, e.g. administrative data structures that should be shared even between copies Python's deep copy operation avoids these problems by: -(a) keeping a table of objects already copied during the current -copying pass + a) keeping a table of objects already copied during the current + copying pass -(b) letting user-defined classes override the copying operation or the + b) letting user-defined classes override the copying operation or the set of components copied This version does not copy types like module, class, function, method, @@ -97,10 +97,7 @@ def _copy_tuple(x): d[types.TupleType] = _copy_tuple def _copy_dict(x): - y = {} - for key in x.keys(): - y[key] = x[key] - return y + return x.copy() d[types.DictionaryType] = _copy_dict def _copy_inst(x): @@ -238,7 +235,12 @@ def _test(): def __init__(self, arg=None): self.a = 1 self.arg = arg - self.fp = open('copy.py') + 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} |