Woah, very good tips presented very concisely! I am guilty of many of these.

I will immediately start using

with open(filename) as:

and using zip() to synchronize list variables.

As for PEP8… I will use four spaces for indentation if I intend to share a script with someone, but for personal scripts I always use a single space indentation and I don’t have any issues. Do pros usually stick to the four space rule in python?

I feel called out by this, though I’ve only encountered about half the things on the list. I use Python with numpy and matplotlib.pyplot for data analysis, but apparently do so terribly inefficiently.