from dbfread import DBF
dbf_file = "/Directory/of/this/file.dbf"
table = DBF(dbf_file, load = True)

def dbf_func(value):
    '''
    Lines of Code that will look this value up in the rows
    in the dbf file, and returns a value from another column
    '''
    return column_value

dbf_func(value)

list of dbf's:
20170901.dbf
20170908.dbf
20170915.dbf
20170922.dbf

if date = 9/23/17, then load 20170922.dbf
if date = 9/14/17, then load 20170915.dbf
if date = 9/09/17, then load 20170915.dbf