switch notebooks to be python 2 and 3 compatible?

[chriddyp]

seems like there is some confusion that our library might not be python 3 compatible because our docs are written in python 2

[cldougl]

@chriddyp do you have the specific tutorial this is referring to? I think this user may actually be referring to the plotly.py version in each notebook.

[chriddyp]

I don't. Here's the full thread where I saw this: https://twitter.com/koehrsen_will/status/1083021973414907906

Looks like some notebooks have plotly.__version__ and others have print plotly.__version__. I think he's referring to the latter (where in Python 3 it's print(plotly.__version))

[cldougl]

@priyatharsan instead of printing the version the version check should be:

to avoid any python 2 vs 3 confusion.

[nicolaskruchten]

Took me a while to catch the distinction! basically we want to avoid print altogether?

[cldougl]

@nicolaskruchten in this context I guess so since it seems to confuse some users and is not necessary to display the version.

[chriddyp]

print(plotly.__version__) is also python 2 & python 3 compatible

[cldougl]

we can use that for necessary print statements throughout other docs but since most pages call plotly.__verison__ at this point anyway I think it will be easier to move toward using that syntax consistently