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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 _atexit_callback(cls):
 """Create Python script copies with updated baselines. For any baseline that had a miscompare, make a copy of the source file which contained the baseline and update the baseline with the new string value. :returns: record of every Python file update (key=path, value=script instance) :rtype: dict """

        updated_scripts = {}

        for baseline in cls._baselines_to_update:

            if baseline.z__path.endswith('<stdin>'):
                continue

            try:
                script = updated_scripts[baseline.z__path]
            except KeyError:
                script = Script(baseline.z__path)
                updated_scripts[baseline.z__path] = script

            script.add_update(baseline.z__linenum, baseline.z__update)

        for key in sorted(updated_scripts):
            script = updated_scripts[key]
            script.update()

        return updated_scripts