Notebook: Jupyter notebook breaks at start on MacOSX with Python 3.7

[remyleone]

# sieben @ sieben-macbook in ~ [15:26:04]
$ python3 --version
Python 3.7.2

# sieben @ sieben-macbook in ~ [15:26:11]
$ jupyter --version
4.4.0

# sieben @ sieben-macbook in ~ [15:26:16]
$ python3 -m jupyter notebook --version
5.7.4

# sieben @ sieben-macbook in ~ [15:26:25]
$ jupyter notebook
Traceback (most recent call last):
  File "/Users/sieben/Library/Python/3.7/bin/jupyter-notebook", line 10, in <module>
    sys.exit(main())
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/jupyter_core/application.py", line 266, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/traitlets/config/application.py", line 657, in launch_instance
    app.initialize(argv)
  File "<decorator-gen-7>", line 2, in initialize
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/traitlets/config/application.py", line 87, in catch_config_error
    return method(app, *args, **kwargs)
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/notebook/notebookapp.py", line 1628, in initialize
    self.init_webapp()
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/notebook/notebookapp.py", line 1378, in init_webapp
    self.jinja_environment_options,
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/notebook/notebookapp.py", line 159, in __init__
    default_url, settings_overrides, jinja_env_options)
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/notebook/notebookapp.py", line 271, in init_settings
    nbextensions_path=jupyter_app.nbextensions_path,
  File "/Users/sieben/Library/Python/3.7/lib/python/site-packages/notebook/notebookapp.py", line 1061, in nbextensions_path
    from IPython.paths import get_ipython_dir
  File "/usr/local/lib/python3.7/site-packages/IPython/__init__.py", line 48, in <module>
    from .core.application import Application
  File "/usr/local/lib/python3.7/site-packages/IPython/core/application.py", line 25, in <module>
    from IPython.core import release, crashhandler
  File "/usr/local/lib/python3.7/site-packages/IPython/core/crashhandler.py", line 28, in <module>
    from IPython.core import ultratb
  File "/usr/local/lib/python3.7/site-packages/IPython/core/ultratb.py", line 124, in <module>
    from IPython.utils import path as util_path
  File "/usr/local/lib/python3.7/site-packages/IPython/utils/path.py", line 18, in <module>
    from IPython.utils.process import system
  File "/usr/local/lib/python3.7/site-packages/IPython/utils/process.py", line 19, in <module>
    from ._process_posix import system, getoutput, arg_split, check_pid
  File "/usr/local/lib/python3.7/site-packages/IPython/utils/_process_posix.py", line 24, in <module>
    import pexpect
  File "/usr/local/lib/python3.7/site-packages/pexpect/__init__.py", line 75, in <module>
    from .pty_spawn import spawn, spawnu
  File "/usr/local/lib/python3.7/site-packages/pexpect/pty_spawn.py", line 14, in <module>
    from .spawnbase import SpawnBase
  File "/usr/local/lib/python3.7/site-packages/pexpect/spawnbase.py", line 224
    def expect(self, pattern, timeout=-1, searchwindowsize=-1, async=False):
                                                                   ^
SyntaxError: invalid syntax

[liujl93]

Try
$pip uninstall pexpect
$pip install pexpect

[remyleone]

It worked. Thank you very much :D

[majidam20]

@liujl93 Thank so much for your help. i really appreciate man
this works
Try
$pip uninstall pexpect
$pip install -U pexpect

[mitulmandaliya]

Thanks a lot. It worked. Can you let us know what caused the error? @liujl93