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Although it is not usually necessary, a class can implement customized copy methods by implementing the methods _ _copy_ _(self) and _ _deepcopy_ _(self, visit), which implement the shallow and deep copy operations respectivelyThe _ _deepcopy_ _() method must accept a dictionary, visit, which is used to keep track of previously encountered objects during the copy process It s not necessary for _ _deepcopy_ _() to do anything with visit other than pass it to other deepcopy() operations carried out in the implementation (if any) If a class implements the methods _ _getstate_ _() and _ _setstate_ _() that are used by the pickle module, they will be used by the copy module to create copies
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This module can be used with simple types such as integers and strings, but there s little need to do so The copy functions don t work with modules, class objects, functions, methods, tracebacks, stack frames, files, sockets, and other similar typesWhen an object can t be copied, the copyerror exception is raised
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The gc module provides an interface for controlling the garbage collector used to collect cycles in objects such as lists, tuples, dictionaries, and instances As various types of container objects are created, they re placed on a list that s internal to the interpreter Whenever container objects are deallocated, they re removed from this list If the number of allocations exceeds the number of deallocations by a user-definable threshold value, the garbage collector is invokedThe garbage collector works by scanning this list and identifying collections of objects that are no longer being used but haven t been deallocated due to circular dependencies In addition, the garbage collector uses a threelevel generational scheme in which objects that survive the initial garbage-collection step are placed onto lists of objects that are checked less frequentlyThis provides better performance for programs that have a large number of long-lived objects
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collect([generation])
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Runs a full garbage collectionThis function checks all generations and returns the number of unreachable objects found generation is an optional integer in the range 0 - 2 that specifies the generation to collect
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Disables garbage collection
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A variable containing a read-only list of user-defined instances that are no longer in use, but which cannot be garbage collected because they are involved in a reference cycle and they define a _ _del_ _() method Such objects cannot be garbage-collected because in order to break the reference cycle, the interpreter must arbitrarily destroy
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one of the objects first However, there is no way to know if the _ _del_ _() method of the remaining objects in the cycle needs to perform critical operations on the object that was just destroyed
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get_objects()
Returns a list of all objects being tracked by the garbage collector Does not include the returned list
get_referrers(obj1, obj2, )
Returns a list of all objects that directly refer to the objects obj1, obj2, and so onThe returned list may include objects that have not yet been garbage-collected as well as partially constructed objects
get_referents(obj1, obj2, )
Returns a list of objects that the objects obj1, obj2, and so on refer to For example, if obj1 is a container, this would return a list of the objects in the container
get_threshold()
Returns the current collection threshold as a tuple
isenabled()
Returns True if garbage collection is enabled
set_debug(flags)
Sets the garbage-collection debugging flags, which can be used to debug the behavior of the garbage collector flags is the bitwise OR of the constants DEBUG_STATS, DEBUG_COLLECTABLE, DEBUG_UNCOLLECTABLE, DEBUG_INSTANCES, DEBUG_OBJECTS, DEBUG_SAVEALL, and DEBUG_LEAKThe DEBUG_LEAK flag is probably the most useful because it will have the collector print information useful for debugging programs with memory leaks
set_threshold(threshold0 [, threshold1[, threshold2]])
Sets the collection frequency of garbage collection Objects are classified into three generations, where generation 0 contains the youngest objects and generation 2 contains the oldest objects Objects that survive a garbage-collection step are moved to the nextoldest generation Once an object reaches generation 2, it stays in that generation threshold0 is the difference between the number of allocations and deallocations that must be reached before garbage collection occurs in generation 0 threshold1 is the number of collections of generation 0 that must occur before generation 1 is scanned threshold2 is the number of collections that must occur in generation 1 before generation 2 is collectedThe default threshold is currently set to (700,10,10) Setting threshold0 to 0 disables garbage collection