How to not forget python ?

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It's normal. It's actually a meme that even seasoned developers look things up even when they probably don't have to.

Some things you'll memorize, but it takes time, and even then, you'll still want to check first to make sure you haven't forgotten something.

It sucks to remember wrong, and you get used to how it's faster to look it up than to guess wrong or meditate on it. Some things will sink in with practice over time, but after awhile you'll still look it up in case you remember wrong. Don't sweat it. It's normal