def sec_url(period):
    """ Create url link to SEC Financial Statement Data Set """
    url = "".join([
        "https://www.sec.gov/files/dera/data/financial-statement-data-sets/",
        period,
        ".zip"
    ])

    # handle weird path exception of SEC
    if period == "2020q1":
        url = "".join([
            "https://www.sec.gov/files/node/add/data_distribution/",
            period,
            ".zip"
        ])
    return url