Pickle-standard free download

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Check it for free with Typograph. Most popular fonts. Hide Show Add to Favorite Download. A wrapper for a buffer representing picklable data. PickleBuffer is itself a buffer provider, therefore it is possible to pass it to other APIs expecting a buffer-providing object, such as memoryview. PickleBuffer objects can only be serialized using pickle protocol 5 or higher.

They are eligible for out-of-band serialization. Return a memoryview of the memory area underlying this buffer. The returned object is a one-dimensional, C-contiguous memoryview with format B unsigned bytes.

BufferError is raised if the buffer is neither C- nor Fortran-contiguous. None , True , and False. Attempts to pickle unpicklable objects will raise the PicklingError exception; when this happens, an unspecified number of bytes may have already been written to the underlying file. Trying to pickle a highly recursive data structure may exceed the maximum recursion depth, a RecursionError will be raised in this case.

You can carefully raise this limit with sys. Thus the defining module must be importable in the unpickling environment, and the module must contain the named object, otherwise an exception will be raised. Similarly, classes are pickled by named reference, so the same restrictions in the unpickling environment apply. These restrictions are why picklable functions and classes must be defined in the top level of a module.

Only the instance data are pickled. This is done on purpose, so you can fix bugs in a class or add methods to the class and still load objects that were created with an earlier version of the class. In this section, we describe the general mechanisms available to you to define, customize, and control how class instances are pickled and unpickled. In most cases, no additional code is needed to make instances picklable.

By default, pickle will retrieve the class and the attributes of an instance via introspection. The default behaviour first creates an uninitialized instance and then restores the saved attributes. The following code shows an implementation of this behaviour:. The method must return a pair args, kwargs where args is a tuple of positional arguments and kwargs a dictionary of named arguments for constructing the object.

In that case, there is no requirement for the state object to be a dictionary. As we shall see, pickle does not use directly the methods described above. The copy protocol provides a unified interface for retrieving the data necessary for pickling and copying objects. For this reason, class designers should use the high-level interface i. The interface is currently defined as follows.

If a string is returned, the string should be interpreted as the name of a global variable. This behaviour is typically useful for singletons. When a tuple is returned, it must be between two and six items long. Optional items can either be omitted, or None can be provided as their value.

The semantics of each item are in order:. A tuple of arguments for the callable object. An empty tuple must be given if the callable does not accept any argument. Optionally, an iterator and not a sequence yielding successive items. These items will be appended to the object either using obj. This is primarily used for list subclasses, but may be used by other classes as long as they have append and extend methods with the appropriate signature. Whether append or extend is used depends on which pickle protocol version is used as well as the number of items to append, so both must be supported.

Optionally, an iterator not a sequence yielding successive key-value pairs. Optionally, a callable with a obj, state signature. New in version 3. The only difference is this method should take a single integer argument, the protocol version. The main use for this method is to provide backwards-compatible reduce values for older Python releases.

For the benefit of object persistence, the pickle module supports the notion of a reference to an object outside the pickled data stream. Such objects are referenced by a persistent ID, which should be either a string of alphanumeric characters for protocol 0 5 or just an arbitrary object for any newer protocol.

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