[Python] How to solve telegram invalid token due to additional newline character?

I have a project with python-telegram-bot where I'm encountering some error. My develop environment is centos7 and python3.6.8

Below contents is code where the errors occure:

import telegram
from telegram.ext import Updater
from telegram.ext import CommandHandler
from telegram.ext import MessageHandler, Filters
from main import *

with open(r"/home/inseo/바탕화면/weather_report/telegram_key.txt","r") as file:
token = file.readline()


wp = Weather_Report()

updater = Updater(token=token, use_context=True)
dispatcher = updater.dispatcher


The file telegram_api.txt contains the api key that I was given by telegram_chatbot. This code is executing normally in windows10, but when I'm going to run this code in linux(centos7) errors occure like below:

[root@localhost weather_report]# python3 message.py
Traceback (most recent call last):
File "message.py", line 13, in <module>
updater = Updater(token=token, use_context=True)
File "/root/.local/lib/python3.6/site-packages/telegram/ext/updater.py", line 290, in __init__
else arbitrary_callback_data
File "/root/.local/lib/python3.6/site-packages/telegram/ext/extbot.py", line 103, in __init__
private_key_password=private_key_password,
File "/root/.local/lib/python3.6/site-packages/telegram/bot.py", line 191, in __init__
self.token = self._validate_token(token)
File "/root/.local/lib/python3.6/site-packages/telegram/bot.py", line 347, in _validate_token
raise InvalidToken()
telegram.error.InvalidToken: Invalid token


I checked that the api key is right, but it doesn't work well. How to solve this problem?

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