def get_month_number(value: str) -> int:
    """

    Parameters
    ----------
    value: string containing short or full month name - min 3 chars long

    Returns
    -------
    int representing month number
    """
    return {'jan': 1,
            'feb': 2,
            'mar': 3,
            'apr': 4,
            'may': 5,
            'jun': 6,
            'jul': 7,
            'aug': 8,
            'sep': 9,
            'oct': 10,
            'nov': 11,
            'dec': 12
            }[value[:3].lower()]