Ошибка сегментирования (стек памяти сброшен на диск)

import csv
from xlsxwriter import Workbook as excel
from math import ceil
from datetime import datetime as dt
from random import randint as rnd
import os
 
#from os import nice as proc_load
#load = min(100, int(20 * int(input('Proc%: ')) / 100))
#proc_load(load)
 
#raise DocumentTooLarge(
#pymongo.errors.DocumentTooLarge: BSON document too large (49304358 bytes) - the connected server supports BSON document sizes up to 16793598 bytes.
 
file_type = 'excel' #input('csv / excel')
file_name = 'report'
max_rows = int(input('Max rows(50000)')) or 50000
rows = int(input('Rows(100000)')) or 100000
 
ff = './{}-{}/{}'.format("111", "reports", "Task_test")
True if os.path.exists('./reports/') else os.makedirs('./reports/')
 
data = {}
 
data['Columns'] = [1,2,3,4,5,6,7,8]
data['Data'] = [521538, '2022-09-11', '00:12:01', 31, 5, 8243.0, 82.43, 8325.43] * rows
 
start = dt.now()
if file_type == 'csv':
    # pythonworld.ru/moduli/modul-csv.htm
    with open(f"{file_name}.csv", 'w', newline='', encoding='utf-8') as file:
        w = csv.writer(file, delimiter=',', quoting=csv.QUOTE_MINIMAL)
        #w.writerow(data['Columns'])
        for d in data['Data']:
            w.writerow(d)
 
elif file_type == 'excel':
    lencolumns = lambda s: 0 if s == None else len(str(s))
    parts = ceil(len(data['Data']) / max_rows)
    gendata = (d for d in data['Data'])
    for part in range(1,  parts + 1):
        with excel("./reports/{}{}.xlsx".format(file_name, f'-{part}' if parts > 1 else '')) as file:
            file.set_properties({
                'title': f'{file_name}', 'subject': 'dates', 'keywords': 'Sample, Example, Properties', 'category': 'Example spreadsheets', 'comments': f'Part: {part} / {parts}',
                'author': 'Reports Builder', 'company': 'FinComp', 'manager':'Data analyst',
                })
                #file.set_custom_property('Checked by', 'Andrey')
                #file.read_only_recommended()
            sheet = file.add_worksheet()
            first_row = 0
##            if 0:
##                sheet.merge_range(0, 0, 0, len(data['Columns']) - 1 if 0 else 25, data['Heading'])
##                row_format = file.add_format({'align': 'left', 'valign': 'vcenter', 'indent': 1, 'bold': True, 'fg_color': '#6A5ACD', 'font_size': 20}) # 'border': 1
##                sheet.set_row(0, None, row_format)
##                first_row = 1
##
            lens = map(lencolumns, data['Columns'])
            sheet.write_row(first_row, 0, data['Columns'])
            row_format = file.add_format({'align': 'center', 'valign': 'vcenter', 'border': 0, 'bold': True, 'fg_color': '#696969', 'font_size': 14})
            sheet.set_row(first_row, None, row_format)
            first_row +=1
 
            row_format = file.add_format({'border': 0, 'valign': 'vcenter', 'fg_color': '#D3D3D3'})
            for r in range(first_row, first_row + max_rows):
                try:
                    d = next(gendata)
                    sheet.write_row(r, 0, d)
                    sheet.set_row(r, None, None if r % 2 else row_format)
                    row = list(map(lencolumns, d))
                    lens = map(max, zip(lens, row))
                except:
                    pass
            for i, w in enumerate(lens):
                sheet.set_column(i, i, w + 1)
                print(part, parts, list(lens))
 
    print(dt.now() - start)

lens = map(max, zip(lens, row))

lens = list(map(max, zip(lens, row)))