upstream/ipython Files · IPython/utils/codeutil.py

DEV: Separate FileCheckpointManager and GenericFileCheckpointManager....

DEV: Separate FileCheckpointManager and GenericFileCheckpointManager. - Adds a `GenericCheckpointMixin` as a helper for implementing the two boundary-traversing Checkpoint API methods, `create_checkpoint` and `restore_checkpoint`. - `GenericFileCheckpointManager` is implemented as a subclass of `FileCheckpointManager` using `GenericCheckpointMixin`. Note that this is the safe subtyping relationship because of method signature *contra*variance: `FileCheckpointManager` accepts `FileContentsManager` in its method signatures type, whereas `GenericFileCheckpointManager` accepts any `ContentsManager`. - Moved Checkpoint-related classes to their own files.

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             codeutil.py
        
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      # encoding: utf-8

      """Utilities to enable code objects to be pickled.

      Any process that import this module will be able to pickle code objects.  This

      includes the func_code attribute of any function.  Once unpickled, new

      functions can be built using new.function(code, globals()).  Eventually

      we need to automate all of this so that functions themselves can be pickled.

      Reference: A. Tremols, P Cogolo, "Python Cookbook," p 302-305

      """

      # Copyright (c) IPython Development Team.

      # Distributed under the terms of the Modified BSD License.

      import sys

      import types

      try:

          import copyreg  # Py 3

      except ImportError:

          import copy_reg as copyreg  # Py 2

      def code_ctor(*args):

          return types.CodeType(*args)

      def reduce_code(co):

          args =  [co.co_argcount, co.co_nlocals, co.co_stacksize,

                  co.co_flags, co.co_code, co.co_consts, co.co_names,

                  co.co_varnames, co.co_filename, co.co_name, co.co_firstlineno,

                  co.co_lnotab, co.co_freevars, co.co_cellvars]

          if sys.version_info[0] >= 3:

              args.insert(1, co.co_kwonlyargcount)

          return code_ctor, tuple(args)

      copyreg.pickle(types.CodeType, reduce_code)

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				# encoding: utf-8

				"""Utilities to enable code objects to be pickled.

				Any process that import this module will be able to pickle code objects. This
				includes the func_code attribute of any function. Once unpickled, new
				functions can be built using new.function(code, globals()). Eventually
				we need to automate all of this so that functions themselves can be pickled.

				Reference: A. Tremols, P Cogolo, "Python Cookbook," p 302-305
				"""

				# Copyright (c) IPython Development Team.
				# Distributed under the terms of the Modified BSD License.

				import sys
				import types
				try:
				import copyreg # Py 3
				except ImportError:
				import copy_reg as copyreg # Py 2

				def code_ctor(*args):
				return types.CodeType(*args)

				def reduce_code(co):
				args = [co.co_argcount, co.co_nlocals, co.co_stacksize,
				co.co_flags, co.co_code, co.co_consts, co.co_names,
				co.co_varnames, co.co_filename, co.co_name, co.co_firstlineno,
				co.co_lnotab, co.co_freevars, co.co_cellvars]
				if sys.version_info[0] >= 3:
				args.insert(1, co.co_kwonlyargcount)
				return code_ctor, tuple(args)

				copyreg.pickle(types.CodeType, reduce_code)