import json
import urllib.request
email = input("Почту введи\n")
val = json.dumps({'email':email})
url = 'http://mom-kebab.herokuapp.com/slack/invite'
reg = urllib.request.Request(url, method='POST')
reg.add_header('Content-Type', 'application/json')
reg.data = val.encode('utf8')

try:
    response = urllib.request.urlopen(reg)
except Exception as error:
    print(error)