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

A number of changes to how traitlets and components work....

A number of changes to how traitlets and components work. * Classes can be given as strings, like 'foo.bar.Bar' in the Type and Instance traitlets as well as the get_instances method of Component. This is done to allow for forward declarations. * New IPython.utils.importstring that imports a class from a string, like 'foo.bar.Bar'.

Brian Granger - - Load All Authors

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             importstring.py
        
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      #!/usr/bin/env python

      # encoding: utf-8

      """

      A simple utility to import something by its string name.

      Authors:

      * Brian Granger

      """

      #-----------------------------------------------------------------------------

      #  Copyright (C) 2008-2009  The IPython Development Team

      #

      #  Distributed under the terms of the BSD License.  The full license is in

      #  the file COPYING, distributed as part of this software.

      #-----------------------------------------------------------------------------

      #-----------------------------------------------------------------------------

      # Functions and classes

      #-----------------------------------------------------------------------------

      def import_item(name):

          """Import and return bar given the string foo.bar."""

          package = '.'.join(name.split('.')[0:-1])

          obj = name.split('.')[-1]

          execString = 'from %s import %s' % (package, obj)

          try:

              exec execString

          except SyntaxError:

              raise ImportError("Invalid class specification: %s" % name)

          exec 'temp = %s' % obj

          return temp

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				#!/usr/bin/env python
				# encoding: utf-8
				"""
				A simple utility to import something by its string name.

				Authors:

				* Brian Granger
				"""

				#-----------------------------------------------------------------------------
				# Copyright (C) 2008-2009 The IPython Development Team
				#
				# Distributed under the terms of the BSD License. The full license is in
				# the file COPYING, distributed as part of this software.
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Functions and classes
				#-----------------------------------------------------------------------------

				def import_item(name):
				"""Import and return bar given the string foo.bar."""
				package = '.'.join(name.split('.')[0:-1])
				obj = name.split('.')[-1]
				execString = 'from %s import %s' % (package, obj)
				try:
				exec execString
				except SyntaxError:
				raise ImportError("Invalid class specification: %s" % name)
				exec 'temp = %s' % obj
				return temp