#NEWLINE# def check_call( self , command , * args , **kwargs ) : #NEWLINE# #INDENT# 'Simulates a call to check_call but executes the command in the\n        running docker image\n\n        ' #NEWLINE# if self . popen ( command ) . returncode : #NEWLINE# #INDENT# raise errors . Error ( '{0} exited with a nonzero value' . format ( self ) )