SyntaxError regarding async when attempting to run Jupyter in Python 3.7

For me, it was conflicting with apt-get installed python3, so I had to first uninstall it/them:

sudo apt-get remove python-pexpect python3-pexpect

And then

sudo pip3.7 install --upgrade pexpect

Download pexpect4.6 source code from https://github.com/pexpect/pexpect/releases/tag/4.6

Extract the source code, get into the folder and install the pexpect by:

sudo python3.7 setup.py install

This should solve your problem. :)

I had the same problem and the following steps worked for me.

I went to /usrlib/python3/dist-packages/pexpect/ and there I

• renamed async.py to _async.py
• opened spawn.py and made these replacements:

  'async=' -> 'async_='
  'async:'-> 'async_:'
  '.async' -> '._async'
  

Hope it helps someone else, too.