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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 update(self, context):
 """Updates all references in the cached representation of the module with their latest code from the specified source code string that was extracted from the emacs buffer. :arg context: the buffer context information. """

        #Get a list of all the operations that need to be performed and then
        #execute them.
        self._operations = self._get_operations(context)

        for i in range(len(self._operations)):
            self._operations[i].handle()
            self.update_extent(self._operations[i])

        #Last of all, we update the string content of the cached version of
        #the module to have the latest source code.
        if len(self._operations) > 0:
            context.module.update_refstring(context.refstring)