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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def do_update(self, subcmd, opts, *args):
 """Bring changes from the repository into the working copy. usage: If no revision given, bring working copy up-to-date with HEAD rev. Else synchronize working copy to revision given by -r. For each updated item a line will start with a character reporting the action taken. These characters have the following meaning: A Added D Deleted U Updated C Conflict G Merged A character in the first column signifies an update to the actual file, while updates to the file's properties are shown in the second column. ${cmd_option_list} """

        print "'svn %s' opts: %s" % (subcmd, opts)
        print "'svn %s' args: %s" % (subcmd, args)