How to use the finmarketpy.util.marketcred.MarketCred.__dict__ function in finmarketpy

def __init__(self):
        try:
            from finmarketpy.util.marketcred import MarketCred
            cred_keys = MarketCred.__dict__.keys()

            for k in MarketConstants.__dict__.keys():
                if k in cred_keys and '__' not in k:
                    setattr(MarketConstants, k, getattr(MarketCred, k))
        except:
            pass