Traceback (most recent call last):


 "./thumbor", line 7, in <module>

from thumbor.server import main


 "/srv/zulip-venv-cache/05ed90ee0fa406871033375ce03c74a9f4b4917a/zulip-thumbor-venv/local/lib/python2.7/site-packages/thumbor/server.py", line 20, in <module>

from tornado.httpserver import HTTPServer


 "/srv/zulip-venv-cache/05ed90ee0fa406871033375ce03c74a9f4b4917a/zulip-thumbor-venv/local/lib/python2.7/site-packages/tornado/httpserver.py", line 34, in <module>

from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters


 "/srv/zulip-venv-cache/05ed90ee0fa406871033375ce03c74a9f4b4917a/zulip-thumbor-venv/local/lib/python2.7/site-packages/tornado/http1connection.py", line 28, in <module>

from tornado import gen


 "/srv/zulip-venv-cache/05ed90ee0fa406871033375ce03c74a9f4b4917a/zulip-thumbor-venv/local/lib/python2.7/site-packages/tornado/gen.py", line 99, in <module>

from singledispatch import singledispatch
# backport
ImportError: No module named singledispatch

Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "/home/user/.virtualenvs/toolbox/lib/python3.7/site-packages/nubia/__init__.py", line 12, in <module>

from .internal.deprecation import deprecated


 "/home/user/.virtualenvs/toolbox/lib/python3.7/site-packages/nubia/internal/deprecation.py", line 15, in <module>

from nubia.internal.typing import inspect_object


 "/home/user/.virtualenvs/toolbox/lib/python3.7/site-packages/nubia/internal/typing/__init__.py", line 68, in <module>

from nubia.internal.helpers import (


 "/home/user/.virtualenvs/toolbox/lib/python3.7/site-packages/nubia/internal/helpers.py", line 17, in <module>

from typing import _Union, Any, Iterable
# noqa T484
ImportError: cannot import name '_Union' from 'typing' (/usr/lib/python3.7/typing.py)
