small bug in tutorial.ipynb

[erensunerr]

Intro

Hi!

I am an undergrad at University of Toronto, I'm just learning Mujoco.

My setup

I'm running the tutorial in google colab. From the documentation's python - tutorial notebook section.

What's happening? What did you expect?

I get TypeError: object of type 'list_iterator' has no len() in analysis of contact forces section.

Steps for reproduction

Run the tutorial up to an including the analysis of contact forces.

Minimal model for reproduction

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Code required for reproduction

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Confirmations

• I searched the latest documentation thoroughly before posting.
• I searched previous Issues and Discussions, I am certain this has not been raised before.

[erensunerr]

I can deal with this if you assign it to me :)