Do you use software design patterns?

Answer 1

for bigger projects for sure

Answer 2

Yes, I do. As Java developer I use pattern both directly (code that I write) and indirectly (third party code that I use). Many frameworks are built using dp and to exploit them it is useful to know dp.

Answer 3

As a Python (amateur) developer, nope. Some are features of the language, and some I just don't care about...

Answer 4

Mostly third party code used.