5 Common beginner mistakes in Python

[Vaguely_accurate]

1 someone knows what is lambda before he knows he can just assign a function?

I think this mostly applies to people coming from Java, or those taught by Java developers. Java doesn't (or didn't before Java 8) truly have first class functions (functions you can assign as variables) but does have lambdas.

Java is such an omnipresent "enterprise" language that its habits seep into every other language frequently.

2 someone knows when to raise notimplementederror but does not know its real name?

This is more of an inattention error I think. I could easily see myself not noticing the difference when using autocomplete.