python def createhexfile: lines = addr = 0 byte_count = 0

while byte_count <len:
    record_data = data
    checksum =  +  + len + sum) & 0xFF
    line = f':{byte_count:02X}{addr:04X}{len:02X}{len}{":".join}{checksum:02X}'
    lines.append
    byte_count += segment_size
    addr += segment_size
lines.append
with open as f:
    f.write)

def parsehexfile: lines = with open as f: lines = f.readlines

data = 
for line in lines:
    line = line.strip
    if line != ':':
        raise Exception
    byte_count = int
    address = int
    record_type = int
    record_data = 
    checksum = int
    if byte_count != len:
        raise Exception
    calculated_checksum =  +  + record_type + sum) & 0xFF
    if calculated_checksum != checksum:
        raise Exception
    if record_type == 0:  # Data Record
        data.extend
return data