Lines Matching full:copy

1 :mod:`copy` --- Shallow and deep copy operations
4 .. module:: copy
5    :synopsis: Shallow and deep copy operations.
7 **Source code:** :source:`Lib/copy.py`
11 Assignment statements in Python do not copy objects, they create bindings
13 mutable items, a copy is sometimes needed so one can change one copy without
14 changing the other. This module provides generic shallow and deep copy
20 .. function:: copy(x)
22    Return a shallow copy of *x*.
27    Return a deep copy of *x*.
39 * A *shallow copy* constructs a new compound object and then (to the extent
42 * A *deep copy* constructs a new compound object and then, recursively, inserts
45 Two problems often exist with deep copy operations that don't exist with shallow
46 copy operations:
51 * Because deep copy copies everything it may copy too much, such as data
62 This module does not copy types like module, method, stack trace, stack frame,
63 file, socket, window, or any similar types.  It does "copy" functions and
67 Shallow copies of dictionaries can be made using :meth:`dict.copy`, and
75 methods.  In fact, the :mod:`copy` module uses the registered
79    single: __copy__() (copy protocol)
80    single: __deepcopy__() (copy protocol)
82 In order for a class to define its own copy implementation, it can define
84 to implement the shallow copy operation; no additional arguments are passed.
85 The latter is called to implement the deep copy operation; it is passed one
87 to make a deep copy of a component, it should call the :func:`deepcopy` function