In python 3 map is a generator, list() it!

[theengineear]

In python 2, you typically get list objects. For efficiency (AFAIK) in
python 3 you’ll get a generator. Note that you can’t iterate through
a generator more than once though!

[theengineear]

@Kully you had a spent generator. This is a tricky issue between Python 2 and Python 3--good we have tests ;)

The problem is that when a generator is iterated over to completion, you typically can't iterate over it again. Many of the functions in Python 2 return lists whereas these same functions return generators in Python 3.

Hope this helps! Feel free to merge it in if you'd like. It's setup to be merged into your branch. It will just add one commit to your PR.

[theengineear]

@Kully, as a heads up, please delete branches you've merged after your finished with them (i.e., after you've merged them). Otherwise they'll stick around in https://github.com/plotly/plotly.py/branches forever 😸