Sphinx: Error when running sphinx-quickstart future = tasks.async(future, loop=self) invalid syntax

[sevaho]

When installing sphinx and running sphinx-quickstart I get the following error:

Traceback (most recent call last):
  File "/usr/sbin/sphinx-quickstart", line 11, in <module>
    load_entry_point('Sphinx==2.0.1', 'console_scripts', 'sphinx-quickstart')()
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 489, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2843, in load_entry_point
    return ep.load()
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2434, in load
    return self.resolve()
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2440, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python3.7/site-packages/sphinx/cmd/quickstart.py", line 43, in <module>
    from sphinx.util.template import SphinxRenderer
  File "/usr/lib/python3.7/site-packages/sphinx/util/template.py", line 13, in <module>
    from jinja2.sandbox import SandboxedEnvironment
  File "/usr/lib/python3.7/site-packages/jinja2/__init__.py", line 82, in <module>
    _patch_async()
  File "/usr/lib/python3.7/site-packages/jinja2/__init__.py", line 78, in _patch_async
    from jinja2.asyncsupport import patch_all
  File "/usr/lib/python3.7/site-packages/jinja2/asyncsupport.py", line 13, in <module>
    import asyncio
  File "/home/sevaho/.local/lib/python3.7/site-packages/asyncio/__init__.py", line 21, in <module>
    from .base_events import *
  File "/home/sevaho/.local/lib/python3.7/site-packages/asyncio/base_events.py", line 296
    future = tasks.async(future, loop=self)
                       ^
SyntaxError: invalid syntax

I ran it in a pipenv environment so it should be isolated :/

Environment info*

• OS: [e.g. Linux]
• Python version: [e.g. 3.7.3]
• Sphinx version: [e.g. 2.1]

[tk0miya]

This is very strange situation. It seems your PC contains "3rd party" asyncio module... And it is not compatible with python 3.7.

  File "/home/sevaho/.local/lib/python3.7/site-packages/asyncio/__init__.py", line 21, in <module>
    from .base_events import *
  File "/home/sevaho/.local/lib/python3.7/site-packages/asyncio/base_events.py", line 296
    future = tasks.async(future, loop=self)
                       ^
SyntaxError: invalid syntax

I don't know why asyncio package is installed. It is no longer needed for python3.7. It was merged into python-core in 3.4.
https://pypi.org/project/asyncio/

Please check why such package is installed and try again after removal of it.

[sevaho]

You are totally right, my bad. Thank you!