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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 verify_minimum_version(self, version_str):
 """ Update version info from server and verify that at least the specified version is present. Returns True if version requirement is satisfied, False if not. """

        self.retrieve_mastodon_version()
        major, minor, patch = parse_version_string(version_str)
        if major > self.mastodon_major:
            return False
        elif major == self.mastodon_major and minor > self.mastodon_minor:
            return False
        elif major == self.mastodon_major and minor == self.mastodon_minor and patch > self.mastodon_patch:
            return False
        return True