copy
index
/usr/lib/python1.6/copy.py

Generic (shallow and deep) copying operations.
 
Interface summary:
 
        import copy
 
        x = copy.copy(y)        # make a shallow copy of y
        x = copy.deepcopy(y)    # make a deep copy of y
 
For module specific errors, copy.error is raised.
 
The difference between shallow and deep copying is only relevant for
compound objects (objects that contain other objects, like lists or
class instances).
 
- A shallow copy constructs a new compound object and then (to the
  extent possible) inserts *the same objects* into in that the
  original contains.
 
- A deep copy constructs a new compound object and then, recursively,
  inserts *copies* into it of the objects found in the original.
 
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,
    contain a reference to themselves) may cause a recursive loop
 
 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
 
 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,
nor stack trace, stack frame, nor file, socket, window, nor array, nor
any similar types.
 
Classes can use the same interfaces to control copying that they use
to control pickling: they can define methods called __getinitargs__(),
__getstate__() and __setstate__().  See the documentation for module
"pickle" for information on these methods.

 
Classes
            
_EmptyClass

 
class _EmptyClass
      # Helper for instance creation without calling __init__
 
  

 
Functions
            
_copy_atomic(x)
_copy_dict(x)
_copy_inst(x)
_copy_list(x)
_copy_tuple(x)
_deepcopy_atomic(x, memo)
_deepcopy_dict(x, memo)
_deepcopy_inst(x, memo)
_deepcopy_list(x, memo)
_deepcopy_tuple(x, memo)
_keep_alive(x, memo)
Keeps a reference to the object x in the memo.
 
Because we remember objects by their id, we have
to assure that possibly temporary objects are kept
alive by referencing them.
We store a reference at the id of the memo, which should
normally not be used unless someone tries to deepcopy
the memo itself...
_test()
copy(x)
Shallow copy operation on arbitrary Python objects.
 
See the module's __doc__ string for more info.
deepcopy(x, memo=None)
Deep copy operation on arbitrary Python objects.
 
See the module's __doc__ string for more info.

 
Data
             Error = 'copy.error'
__file__ = '/usr/lib/python1.6/copy.pyc'
__name__ = 'copy'
_copy_dispatch = {<type 'code'>: <function _copy_atomic at 82ff028>, <type 'class'>: <function _copy_atomic at 82ff028>, <type 'instance'>: <function _copy_inst at 82fe6b8>, <type 'float'>: <function _copy_atomic at 82ff028>, <type 'int'>: <function _copy_atomic at 82ff028>, <type 'list'>: <function _copy_list at 82fecf8>, <type 'long int'>: <function _copy_atomic at 82ff028>, <type 'dictionary'>: <function _copy_dict at 82febd8>, <type 'None'>: <function _copy_atomic at 82ff028>, <type 'string'>: <function _copy_atomic at 82ff028>, ...}
_deepcopy_dispatch = {<type 'code'>: <function _deepcopy_atomic at 82ff0a0>, <type 'instance'>: <function _deepcopy_inst at 82fef48>, <type 'float'>: <function _deepcopy_atomic at 82ff0a0>, <type 'int'>: <function _deepcopy_atomic at 82ff0a0>, <type 'list'>: <function _deepcopy_list at 82ff0c0>, <type 'long int'>: <function _deepcopy_atomic at 82ff0a0>, <type 'dictionary'>: <function _deepcopy_dict at 82fef08>, <type 'None'>: <function _deepcopy_atomic at 82ff0a0>, <type 'string'>: <function _deepcopy_atomic at 82ff0a0>, <type 'tuple'>: <function _deepcopy_tuple at 82feee8>, ...}
error = 'copy.error'