In [2]: import plotly. 
Traceback (most recent call last):
 File "/home/emma/sandbox/venv_new/bin/ipython3", line 10, in <module>
 sys.exit(start_ipython())
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/__init__.py", line 126, in start_ipython
 return launch_new_instance(argv=argv, **kwargs)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/traitlets/config/application.py", line 664, in launch_instance
 app.start()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/terminal/ipapp.py", line 356, in start
 self.shell.mainloop()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 558, in mainloop
 self.interact()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 541, in interact
 code = self.prompt_for_code()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 469, in prompt_for_code
 **self._extra_prompt_options())
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 994, in prompt
 return self.app.run(set_exception_handler=set_exception_handler)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 812, in run
 self.run_async(pre_run=pre_run, set_exception_handler=set_exception_handler)
 File "/usr/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
 return future.result()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 778, in run_async
 return await _run_async2()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 766, in _run_async2
 await self.cancel_and_wait_for_background_tasks()
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 867, in cancel_and_wait_for_background_tasks
 await task
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1854, in new_coroutine
 await coroutine(*a, **kw)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1684, in async_completer
 document, complete_event
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/completion/base.py", line 270, in get_completions_async
 document, complete_event
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/prompt_toolkit/completion/base.py", line 196, in get_completions_async
 for item in self.get_completions(document, complete_event):
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/terminal/ptutils.py", line 92, in get_completions
 yield from self._get_completions(body, offset, cursor_position, self.ipy_completer)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/terminal/ptutils.py", line 102, in _get_completions
 for c in completions:
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completer.py", line 438, in _deduplicate_completions
 completions = list(completions)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completer.py", line 1819, in completions
 for c in self._completions(text, offset, _timeout=self.jedi_compute_type_timeout/1000):
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completer.py", line 1863, in _completions
 full_text=full_text, cursor_line=cursor_line, cursor_pos=cursor_column)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completer.py", line 2060, in _complete
 custom_res = [(m, 'custom') for m in self.dispatch_custom_completer(text) or []]
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completer.py", line 1747, in dispatch_custom_completer
 res = c(event)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completerlib.py", line 256, in module_completer
 return module_completion(event.line)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completerlib.py", line 233, in module_completion
 completion_list = try_import('.'.join(mod[:-1]), True)
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completerlib.py", line 172, in try_import
 completions.extend( [attr for attr in dir(m) if
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completerlib.py", line 173, in <listcomp>
 is_importable(m, attr, only_modules)])
 File "/home/emma/sandbox/venv_new/lib/python3.7/site-packages/IPython/core/completerlib.py", line 153, in is_importable
 return inspect.ismodule(getattr(module, attr))
 File "/home/emma/code/plotly.py/packages/python/plotly/_plotly_utils/importers.py", line 29, in __getattr__
 return importlib.import_module(rel_import, parent_name)
 File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
 return _bootstrap._gcd_import(name[level:], package, level)
 File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
 File "<frozen importlib._bootstrap>", line 983, in _find_and_load
 File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
 File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
 File "<frozen importlib._bootstrap_external>", line 728, in exec_module
 File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
 File "/home/emma/code/plotly.py/packages/python/plotly/plotly/express/__init__.py", line 12, in <module>
 Plotly express requires pandas to be installed."""
ImportError: Plotly express requires pandas to be installed.
If you suspect this is an IPython 7.13.0 bug, please report it at:
 https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@python.org
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