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I am new to Pythonista. I use python mainly for plotting and fitting. The problem is that whenever I try to plot something with matplotlib, pythonista just quit (or collapse) automatically. It won’t even run the example scripts downloaded with the app. Could anyone help? Thanks

Are you using Python 2 or 3? There are some known problems in the current Pythonista version, where using matplotlib in Python 2 crashes the app. Unfortunately this has not been fixed yet, so for now if you want to use matplotlib, you need to use Python 3. (The default Python version can be changed under "Default Interpreter" in the Pythonista settings.)