[Tutor] How do I create a "loop until" looping structure?

[Wolfgang Maier]

On 21.05.2014 12:32, 1 2 wrote:
> Hi there,
>    As shown in the codes below, I want to end the loop until the s is no
> greater than -5 but I found there is no "do... loop until..." like C so
> what should I do? I will write it in C's style
>
> s,n = 0,1
> do:
>      import math
>      s=s+(math.log((n+1)/(n+2))/math.log(2))
> loop until s < -5
> print(s)
>

Hi,
there's no do .. until in Python, but while exists.
So just invert your condition and use it at the top of a while loop (as 
you could do in C as well).
Note also that your importing math inside the loop doesn't make sense. 
You want to import the module once in the beginning instead.
Best,
Wolfgang