$ ipython
Python 3.6.4 (default, Mar 22 2018, 14:11:17) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.0.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import os
Traceback (most recent call last):
  File "/Users/brettmz/.virtualenvs/dsfe/bin/ipython", line 11, in <module>
    sys.exit(start_ipython())
  File "/Users/brettmz/.virtualenvs/dsfe/lib/python3.6/site-packages/IPython/__init__.py", line 125, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/Users/brettmz/.virtualenvs/dsfe/lib/python3.6/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/Users/brettmz/.virtualenvs/dsfe/lib/python3.6/site-packages/IPython/terminal/ipapp.py", line 356, in start
    self.shell.mainloop()
  File "/Users/brettmz/dev_trees/rlipython/rlipython/shell.py", line 454, in mainloop
    self.interact(display_banner=display_banner)
  File "/Users/brettmz/dev_trees/rlipython/rlipython/shell.py", line 571, in interact
    self.input_splitter.push(line)
AttributeError: 'TransformerManager' object has no attribute 'push'

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at [email protected]

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True