iso8583sim

pip install iso8583sim

from iso8583sim.core.builder import ISO8583Builder
from iso8583sim.core.parser import ISO8583Parser
from iso8583sim.core.samples import sample_message

# A VISA authorization request for 25.00
raw = ISO8583Builder().build(sample_message(amount_minor_units=2500))

message = ISO8583Parser().parse(raw)
print(message.mti, message.network, message.fields[4])
# 0100 CardNetwork.VISA 000000002500