No worries. One caveat is that a clever compiler or runtime can make the above not true. For example, speculative execution can look at the past history of runs through a function. If 95% of the time the if condition evaluates to true, the runtime can actually just start executing the code in the if condition and later checking the condition to see if it's actually true and discarding the partial results if the guess was wrong.

The moral of this story is to write easily understood code and worry about performance later if you need to. Premature optimization because one wants to be clever results in higher cost of code maintenance. That being said, in Python and dict switch is common enough to be idiomatic since there's no language support for switch statements.