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It depends, someone finds Lua is easier for a beginner, the others prefer Python. I’d like to share some of my experience as a glance.

Lua and Python in common:

1. Both are scripting, dynamic typed, weak typed. Pro: there’s no complex compiling pipeline, it is often just one click to launch a new program; Con: it doesn’t check variable types before running, so you have to keep in mind which variables are for what, but good naming would help.
2. The languages themselves do not offer the ability to create a game directly, Lua is often embedded in integrated development kits, Python can import game creation libs.

Differences:

1. Lua is prototype-based, Python is class-based. Someone find class-based is more intuitive than prototype-based to understand, but once you get the idea of prototype, in my personal opinion, it is more elegant for game development.
2. Because of its embedded nature, installing a Lua-based development kit is often simpler than Python.

Finally I recommend you to try them both, for example the Love2d or my Bitty Engine (trial on steam), and pygame, try reading and modifying some example code, evaluate the documents and communities, make some short programs by your own, then choose the more comfortable and easier to understand one. If you feel difficult to get into it after attempts, just switch to another. And once you get used to one of them, it will be simpler to either dive further or switch to another. Overall I recommend them both than other languages (JavaScript, C#, C++, etc) for beginners.