我可以使用eval重新创建代码，它会提高性能吗？

Question

I have an infinite loop using while true in this loop end, I always check if this is the first iteration of the loop if this is the first iteration continue, if this is the second and on sleep(1200)

I wonder what is the best way to avoid checking each iteration the if condition? that condition is true only once and I will run the loop for 10^10000 times.

Is there a performance benefit from using eval as so:

crazy = r""" crazy = "sleep(120)" """

while True:
    // do some code
    eval(crazy)

This will rewrite crazy var at first loop, later will execute the sleep only. I know it is unsafe, but one day smart code will be a code that write it self.

Answer 1

I doubt eval is going to be any more efficient than if .

If you want to avoid an 'if' then the following code will work.

n=0
while True:
    // do some code
    sleep(n)
    n=1200

Or to remove that line entirely

doSomeCode()
while True:
    doSomeCode()
    sleep(1200)

But to be honest, unless you know you have a specific performance problem, that's not masked by the fact you're looping only once every 20 minute, you're probably optimising prematurely.