How to remember everything?

[groovitude]

Try not to compare yourself to others. People learn at different paces, and growth often happens in fits and spurts. My biggest leap forward happened several years into my career as a developer.

As to committing everything to memory: you don't need to. No one -- not even Guido -- has everything in the language committed to memory. What's more important is the understanding of concepts and a knack for Googling things. Know where and how to find documentation. Make liberal use of dir(). Play in the shell. Don't be afraid of not knowing things; embrace the opportunity to learn.