v0.0.2 cannot import name 'PlotlyScope' on Windows venv

[WEGFan]

>>> from kaleido.scopes.plotly import PlotlyScope
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "D:\My Documents\GitHub\codestats-profile-readme\venv\lib\site-packages\kaleido\scopes\plotly.py", line 4, in <module>
 from plotly.graph_objects import Figure
 File "D:\My Documents\GitHub\codestats-profile-readme\venv\lib\site-packages\plotly\__init__.py", line 34, in <module>
 from plotly import (
 File "D:\My Documents\GitHub\codestats-profile-readme\venv\lib\site-packages\plotly\io\__init__.py", line 5, in <module>
 from ._kaleido import to_image, write_image
 File "D:\My Documents\GitHub\codestats-profile-readme\venv\lib\site-packages\plotly\io\_kaleido.py", line 8, in <module>
 from kaleido.scopes.plotly import PlotlyScope
ImportError: cannot import name 'PlotlyScope'

It seems like it's a circular import problem and #18 causes it, but neither Linux with venv nor Windows without venv has this issue.
I'm using Python 3.6.8 on Windows and 3.6.2 on Linux.

[jonmmease]

Hi @WEGFan, what version of the plotly package do you have installed in each environment?

[WEGFan]

Both are 4.9.0

[WEGFan]

Oh I forgot to say I add a line in plotly/io/_kaleido.py here to find out what caused the PlotlyScopebe None

try:
 from kaleido.scopes.plotly import PlotlyScope

 scope = PlotlyScope()

 # Compute absolute path to the 'plotly/package_data/' directory
 root_dir = os.path.dirname(os.path.abspath(plotly.__file__))
 package_dir = os.path.join(root_dir, "package_data")
 scope.plotlyjs = os.path.join(package_dir, "plotly.min.js")
 scope.mathjax = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js"
except ImportError:
 raise # here
 PlotlyScope = None
 scope = None

[jonmmease]

Thanks for info the debugging @WEGFan. I'm not able to reproduce yet, but there is a circular import here that we might as well get rid of.

In kaleido/py/kaleido/scopes/plotly.py, we can move the from plotly.graph_objects import Figure related import down into the transform method.

Here is a PR that does this: #25. Could you give this a try (The change is moving a single line, so you could edit it manually as you did above).

[WEGFan]

It worked, but I still wonder why it happened only in venv...

[jonmmease]

Great! I'm also not sure what is going on with the virtual environment there.

Until we get the next release out, I'm pretty sure you wouldn't run into this issue if you could use Python 3.7+ in your venv since plotly.py imports submodules, like plotly.io, lazily in this case.

[jonmmease]

This fix has been released in version 0.0.3