Python string formatting: % vs concatenation

Question

I\'m developing an application in which I perform some requests to get an object id. After each one of them, I call a method (get_actor_info()) passing this id

Answer 1

Concatenation is better when it comes to performance. In your example, both concatenation and substitution are readable but when it comes to more complex templates, substitution wins the simplicity and readability race.

For example, if you have data and you want show it in html, concatenation will cause you headache, while substitution will be simple and readable.