get a list of users from active directory from police department, output to spreadsheet, order column by name

def get_police_users(department):
    import ldap
    import re
    from openpyxl import Workbook
    from openpyxl import load_workbook
    
    wb = Workbook()
    ws = wb.active
    # connect to active directory
    conn = ldap.initialize('ldap://ldap.yourdomain.com')
    # search for users in department in active directory
    results = conn.search_s('dc=yourdomain,dc=com', ldap.SCOPE_SUBTREE, "department=" + department, ['cn'])
    
    # create spreadsheet and add users in department to it
    ws.append(["Users"])
    for result in results:
        ws.append([re.findall('(?<=cn=).*', result[1]['cn'][0].decode('utf-8'))[0]])
    wb.save("output.xlsx")
    
    # open spreadsheet and sort by last name
    wb = load