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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 python_utc_datetime_to_sqlite_strftime_string( value: datetime.datetime) -> str: """ Converts a Python datetime to a string literal compatible with SQLite, including the millisecond field. """

    millisec_str = str(round(value.microsecond / 1000)).zfill(3)
    return value.strftime("%Y-%m-%d %H:%M:%S") + "." + millisec_str