old_contents: ##########################################################################
  #  
  #  Copyright (c) 2011-2012, John Haddon. All rights reserved.
  #  
  #  Redistribution and use in source and binary forms, with or without
  #  modification, are permitted provided that the following conditions are
  #  met:
  #  
  #      * Redistributions of source code must retain the above
  #        copyright notice, this list of conditions and the following
  #        disclaimer.
  #  
  #      * Redistributions in binary form must reproduce the above
  #        copyright notice, this list of conditions and the following
  #        disclaimer in the documentation and/or other materials provided with
  #        the distribution.
  #  
  #      * Neither the name of John Haddon nor the names of
  #        any other contributors to this software may be used to endorse or
  #        promote products derived from this software without specific prior
  #        written permission.
  #  
  #  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  #  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  #  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  #  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  #  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  #  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  #  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  #  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  #  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  #  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  #  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  #  
  ##########################################################################
  
  import traceback
  import IECore
  import Gaffer
  
  class python( Gaffer.Application ) :
  
  	def __init__( self ) :
  	
  		Gaffer.Application.__init__( self )
  		
  		self.parameters().addParameters(
  		
  			[
  				
  				IECore.FileNameParameter(
  					name = "file",
  					description = "The python script to execute",
  					defaultValue = "",
  					extensions = "py",
  					allowEmptyString = False,
  					check = IECore.FileNameParameter.CheckType.MustExist,
  				),
  				
  				IECore.StringVectorParameter(
  					name = "arguments",
  					description = "An arbitrary list of arguments which will be provided to "
  						"the python script in a variable called argv.",
  					defaultValue = IECore.StringVectorData(),
  				),
  				
  			]
  		
  		)
  		
  		self.parameters().userData()["parser"] = IECore.CompoundObject(
  			{
  				"flagless" : IECore.StringVectorData( [ "file", "arguments" ] )
  			}
  		)
  		
  	def _run( self, args ) :
  
  		try :
  			execfile( args["file"].value, { "argv" : args["arguments"] } )
  			return 0
  		except :
  			traceback.print_exc()
  			return 1
  
  IECore.registerRunTimeTyped( python )
  
new_contents: ##########################################################################
  #  
  #  Copyright (c) 2011-2012, John Haddon. All rights reserved.
  #  
  #  Redistribution and use in source and binary forms, with or without
  #  modification, are permitted provided that the following conditions are
  #  met:
  #  
  #      * Redistributions of source code must retain the above
  #        copyright notice, this list of conditions and the following
  #        disclaimer.
  #  
  #      * Redistributions in binary form must reproduce the above
  #        copyright notice, this list of conditions and the following
  #        disclaimer in the documentation and/or other materials provided with
  #        the distribution.
  #  
  #      * Neither the name of John Haddon nor the names of
  #        any other contributors to this software may be used to endorse or
  #        promote products derived from this software without specific prior
  #        written permission.
  #  
  #  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  #  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  #  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  #  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  #  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  #  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  #  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  #  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  #  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  #  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  #  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  #  
  ##########################################################################
  
  import traceback
  import IECore
  import Gaffer
  
  class python( Gaffer.Application ) :
  
  	def __init__( self ) :
  	
  		Gaffer.Application.__init__( self )
  		
  		self.parameters().addParameters(
  		
  			[
  				
  				IECore.FileNameParameter(
  					name = "file",
  					description = "The python script to execute",
  					defaultValue = "",
  					allowEmptyString = False,
  					check = IECore.FileNameParameter.CheckType.MustExist,
  				),
  				
  				IECore.StringVectorParameter(
  					name = "arguments",
  					description = "An arbitrary list of arguments which will be provided to "
  						"the python script in a variable called argv.",
  					defaultValue = IECore.StringVectorData(),
  				),
  				
  			]
  		
  		)
  		
  		self.parameters().userData()["parser"] = IECore.CompoundObject(
  			{
  				"flagless" : IECore.StringVectorData( [ "file", "arguments" ] )
  			}
  		)
  		
  	def _run( self, args ) :
  
  		try :
  			execfile( args["file"].value, { "argv" : args["arguments"] } )
  			return 0
  		except :
  			traceback.print_exc()
  			return 1
  
  IECore.registerRunTimeTyped( python )
  
subject: Support for arbitrary file extensions