from pymarc import MARCReader
from pymarc import Record, Field

with open('machiavellism_biu_2018.mrc', 'rb') as fh:
    reader = MARCReader(fh, to_unicode=True)
    # loop 1
    recnum = 0
    for record in reader:
        # loop 2
        recnum += 1
        for tield_contents in record.get_fields():
            print ('%09d' % recnum,' ',tield_contents.tag,'  ',' L',tield_contents.value())
        ## end loop 2

python pymarc_000002.py

000000001   001     L 002547390
000000001   003     L OCoLC
000000001   005     L 20181016125657.0
000000001   008     L 180214t20182018enka     b    001 0 eng
000000001   092     L 302 BER m
000000001   020     L 9781138093317
000000001   035     L (OCoLC)991673448
000000001   040     L eng rda
000000001   041     L eng
000000001   100     L Bereczkei, Tamás lat author
000000001   245     L Machiavellianism : the psychology of manipulation / Tamas Bereczkei.
000000001   264     L London : Routledge, 2018.
000000001   264     L ©2018