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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 updateFile(cls, file_, url):
 """Check and update file compares with remote_url Args: file_: str. Local filename. Normally it's __file__ Returns: bool: file updated or not """

        def compare(s1, s2):
            return s1 == s2, len(s2) - len(s1)

        if not url or not file_:
            return False
        try:
            req = urllib.request.urlopen(url)
            raw_codes = req.read()
            with open(file_, 'rb') as f:
                current_codes = f.read().replace(b'\r', b'')
            is_same, diff = compare(current_codes, raw_codes)
            if is_same:
                cit.info("{} is already up-to-date.".format(file_))
                return False
            else:
                cit.ask("A new version is available. Update? (Diff: {})".format(diff))
                if cit.get_choice(['Yes', 'No']) == 'Yes':
                    with open(file_, 'wb') as f:
                        f.write(raw_codes)
                    cit.info("Update Success.")
                    return True
                else:
                    cit.warn("Update Canceled")
                    return False
        except Exception as e:
            cit.err("{f} update failed: {e}".format(f=file_, e=e))
            return False