Don't allow Jedi to go to v1.18.0

This addresses issue https://github.com/ipython/ipython/issues/12740, where autocomplete breaks with the latest version of Jedi (1.18.0)

setup.py

@@ -1,263 +1,263 b''
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Setup script for IPython.
 
 Under Posix environments it works like a typical setup.py script.
 Under Windows, the command sdist is not supported, since IPython
 requires utilities which are not available under Windows."""
 
 #-----------------------------------------------------------------------------
 #  Copyright (c) 2008-2011, IPython Development Team.
 #  Copyright (c) 2001-2007, Fernando Perez <[e-mail]>
 #  Copyright (c) 2001, Janko Hauser <[e-mail]>
 #  Copyright (c) 2001, Nathaniel Gray <[e-mail]>
 #
 #  Distributed under the terms of the Modified BSD License.
 #
 #  The full license is in the file COPYING.rst, distributed with this software.
 #-----------------------------------------------------------------------------
 
 import os
 import sys
 from pathlib import Path
 
 # **Python version check**
 #
 # This check is also made in IPython/__init__, don't forget to update both when
 # changing Python version requirements.
 if sys.version_info < (3, 7):
     pip_message = 'This may be due to an out of date pip. Make sure you have pip >= 9.0.1.'
     try:
         import pip
         pip_version = tuple([int(x) for x in pip.__version__.split('.')[:3]])
         if pip_version < (9, 0, 1) :
             pip_message = 'Your pip version is out of date, please install pip >= 9.0.1. '\
             'pip {} detected.'.format(pip.__version__)
         else:
             # pip is new enough - it must be something else
             pip_message = ''
     except Exception:
         pass
 
 
     error = """
 IPython 7.17+ supports Python 3.7 and above, following NEP 29.
 When using Python 2.7, please install IPython 5.x LTS Long Term Support version.
 Python 3.3 and 3.4 were supported up to IPython 6.x.
 Python 3.5 was supported with IPython 7.0 to 7.9.
 Python 3.6 was supported with IPython up to 7.16.
 
 See IPython `README.rst` file for more information:
 
     https://github.com/ipython/ipython/blob/master/README.rst
 
 Python {py} detected.
 {pip}
 """.format(py=sys.version_info, pip=pip_message )
 
     print(error, file=sys.stderr)
     sys.exit(1)
 
 # At least we're on the python version we need, move on.
 
 # BEFORE importing distutils, remove MANIFEST. distutils doesn't properly
 # update it when the contents of directories change.
 if Path("MANIFEST").exists():
     Path("MANIFEST").unlink()
 
 from distutils.core import setup
 
 # Our own imports
 from setupbase import target_update
 
 from setupbase import (
     setup_args,
     find_packages,
     find_package_data,
     check_package_data_first,
     find_entry_points,
     build_scripts_entrypt,
     find_data_files,
     git_prebuild,
     install_symlinked,
     install_lib_symlink,
     install_scripts_for_symlink,
     unsymlink,
 )
 
 #-------------------------------------------------------------------------------
 # Handle OS specific things
 #-------------------------------------------------------------------------------
 
 if os.name in ('nt','dos'):
     os_name = 'windows'
 else:
     os_name = os.name
 
 # Under Windows, 'sdist' has not been supported.  Now that the docs build with
 # Sphinx it might work, but let's not turn it on until someone confirms that it
 # actually works.
 if os_name == 'windows' and 'sdist' in sys.argv:
     print('The sdist command is not available under Windows.  Exiting.')
     sys.exit(1)
 
 
 #-------------------------------------------------------------------------------
 # Things related to the IPython documentation
 #-------------------------------------------------------------------------------
 
 # update the manuals when building a source dist
 if len(sys.argv) >= 2 and sys.argv[1] in ('sdist','bdist_rpm'):
 
     # List of things to be updated. Each entry is a triplet of args for
     # target_update()
     to_update = [
                  ('docs/man/ipython.1.gz',
                   ['docs/man/ipython.1'],
                   'cd docs/man && gzip -9c ipython.1 > ipython.1.gz'),
                  ]
 
 
     [ target_update(*t) for t in to_update ]
 
 #---------------------------------------------------------------------------
 # Find all the packages, package data, and data_files
 #---------------------------------------------------------------------------
 
 packages = find_packages()
 package_data = find_package_data()
 
 data_files = find_data_files()
 
 setup_args['packages'] = packages
 setup_args['package_data'] = package_data
 setup_args['data_files'] = data_files
 
 #---------------------------------------------------------------------------
 # custom distutils commands
 #---------------------------------------------------------------------------
 # imports here, so they are after setuptools import if there was one
 from distutils.command.sdist import sdist
 
 setup_args['cmdclass'] = {
     'build_py': \
             check_package_data_first(git_prebuild('IPython')),
     'sdist' : git_prebuild('IPython', sdist),
     'symlink': install_symlinked,
     'install_lib_symlink': install_lib_symlink,
     'install_scripts_sym': install_scripts_for_symlink,
     'unsymlink': unsymlink,
 }
 
 
 #---------------------------------------------------------------------------
 # Handle scripts, dependencies, and setuptools specific things
 #---------------------------------------------------------------------------
 
 # For some commands, use setuptools.  Note that we do NOT list install here!
 # If you want a setuptools-enhanced install, just run 'setupegg.py install'
 needs_setuptools = {'develop', 'release', 'bdist_egg', 'bdist_rpm',
            'bdist', 'bdist_dumb', 'bdist_wininst', 'bdist_wheel',
            'egg_info', 'easy_install', 'upload', 'install_egg_info',
           }
 
 if len(needs_setuptools.intersection(sys.argv)) > 0:
     import setuptools
 
 # This dict is used for passing extra arguments that are setuptools
 # specific to setup
 setuptools_extra_args = {}
 
 # setuptools requirements
 
 extras_require = dict(
     parallel = ['ipyparallel'],
     qtconsole = ['qtconsole'],
     doc = ['Sphinx>=1.3'],
     test = ['nose>=0.10.1', 'requests', 'testpath', 'pygments', 'nbformat', 'ipykernel', 'numpy>=1.14'],
     terminal = [],
     kernel = ['ipykernel'],
     nbformat = ['nbformat'],
     notebook = ['notebook', 'ipywidgets'],
     nbconvert = ['nbconvert'],
 )
 
 install_requires = [
     'setuptools>=18.5',
-    'jedi>=0.16',
+    'jedi>=0.16,<0.18.0',
     'decorator',
     'pickleshare',
     'traitlets>=4.2',
     'prompt_toolkit>=2.0.0,<3.1.0,!=3.0.0,!=3.0.1',
     'pygments',
     'backcall',
     'stack_data',
 ]
 
 # Platform-specific dependencies:
 # This is the correct way to specify these,
 # but requires pip >= 6. pip < 6 ignores these.
 
 extras_require.update(
     {
         ':sys_platform != "win32"': ["pexpect>4.3"],
         ':sys_platform == "darwin"': ["appnope"],
         ':sys_platform == "win32"': ["colorama"],
     }
 )
 # FIXME: re-specify above platform dependencies for pip < 6
 # These would result in non-portable bdists.
 if not any(arg.startswith('bdist') for arg in sys.argv):
     if sys.platform == 'darwin':
         install_requires.extend(['appnope'])
 
     if not sys.platform.startswith("win"):
         install_requires.append("pexpect>4.3")
 
     # workaround pypa/setuptools#147, where setuptools misspells
     # platform_python_implementation as python_implementation
     if 'setuptools' in sys.modules:
         for key in list(extras_require):
             if 'platform_python_implementation' in key:
                 new_key = key.replace('platform_python_implementation', 'python_implementation')
                 extras_require[new_key] = extras_require.pop(key)
 
 everything = set()
 for key, deps in extras_require.items():
     if ':' not in key:
         everything.update(deps)
 extras_require['all'] = list(sorted(everything))
 
 if 'setuptools' in sys.modules:
     setuptools_extra_args['python_requires'] = '>=3.7'
     setuptools_extra_args['zip_safe'] = False
     setuptools_extra_args['entry_points'] = {
         'console_scripts': find_entry_points(),
         'pygments.lexers': [
             'ipythonconsole = IPython.lib.lexers:IPythonConsoleLexer',
             'ipython = IPython.lib.lexers:IPythonLexer',
             'ipython3 = IPython.lib.lexers:IPython3Lexer',
         ],
     }
     setup_args['extras_require'] = extras_require
     setup_args['install_requires'] = install_requires
 
 else:
     # scripts has to be a non-empty list, or install_scripts isn't called
     setup_args['scripts'] = [e.split('=')[0].strip() for e in find_entry_points()]
 
     setup_args['cmdclass']['build_scripts'] = build_scripts_entrypt
 
 #---------------------------------------------------------------------------
 # Do the actual setup now
 #---------------------------------------------------------------------------
 
 setup_args.update(setuptools_extra_args)
 
 
 
 def main():
     setup(**setup_args)
 
 if __name__ == '__main__':
     main()