why excel process stay opened after printing - python-3.7

Question

i use these packages:
openpyxl - copy excel templates, opened copied file, save data from db, print it and then delete;
pywin32 - send for printing to remote network printer by network name;
after some processes, i don't know which - excel process window still opened. (attach screenshot)
i attach the most using in my project functions.
this program it's like a web service, which listening 5000 port and print in needed template.
i delete all created files, because of no need to store all of them.
from openpyxl import load_workbook
import os
import app_config as config
import printers.printers as p
from datetime import datetime
import shutil
import time
class EditExcelTemplate:
def __init__(self, template_name):
now = datetime.now()
report_name = "_{}{}{}_{}{}{}_{}".format(now.year, now.month, now.day,
now.hour, now.minute, now.second,
now.microsecond)
self.report_path = config.EXCEL_REPORT_PATH.format(template_name +
report_name)
shutil.copy(src=config.EXCEL_TEMPLATE_PATH.format(template_name),
dst=self.report_path)
# self.wb = load_workbook(filename=config.EXCEL_TEMPLATE_PATH.format(template_name))
start_load = time.time()
self.wb = load_workbook(filename=self.report_path,
keep_links=False,
keep_vba=False,
data_only=True)
end_load = time.time()
print('LOAD WORKBOOK|{}'.format(str(end_load - start_load)))
self.ws = self.wb.active
self.answer = {'file_name': template_name.upper()}
def write_workbook(self, row_dest, column_dest, value):
c = self.ws.cell(row=row_dest, column=column_dest)
c.value = value
def save_excel(self):
self.wb.save(self.report_path)
def print_excel(self, printer_no):
p.print_excel(printer_no=printer_no, path_to_file=self.report_path)
def print_excel_file(self, printer_name):
p.print_excel_file(printer_name=printer_name, path_to_file=self.report_path)
import win32api
import app_config
import os, time
def print_excel(printer_no, path_to_file):
printer_name = app_config.PRINTER_NAMES[printer_no]
win32api.ShellExecute(
1,
'printto',
path_to_file,
'{}'.format(printer_name),
'.',
0
)
def delete_file(path_to_file, try_count=1):
if os.path.exists(path=path_to_file):
file_name = path_to_file.split('\\')[-1]
while try_count < 60:
try:
os.remove(path_to_file)
print('File {} deleted!'.format(file_name))
break
except PermissionError:
print('Can not delete file {}. Hold {} sec.'.format(file_name, try_count))
time.sleep(1.0)
try_count += 1