On Thursday, June 23, 2016 at 1:20:37 AM UTC-4, DFS wrote:
> On 6/23/2016 12:17 AM, Elizabeth Weiss wrote:
>
> > CODE #1:
> >
> > i=0
> > while 1==1:
> > print(i)
> > i=i+1
> > if i>=5:
> > print("Breaking")
> > break
> >
> > ------
> > I understand that i=0 and i will only be printed if 1=1
> > The results of this is
> > 0
> > 1
> > 2
> > 3
> > 4
> > Breaking
> >
> > Why is Breaking going to be printed if i only goes up to 4? It does say if
> > i>=5? Shouldn't this mean that the results should be:
>
> i is incremented up to 5, but you're printing i before incrementing and
> evaluating it.
>
> Move i=i+1 to the end and try it again.
>
>
>
>
>
> > CODE #2:
> >
> > i=0
> > while True:
> > i=i+1
> > if i==2:
> > print("Skipping 2")
> > continue
> > if i==5:
> > print("Breaking")
> > break
> > print(i)
> >
> > ------
> >
> > Questions:
> > 1. what does the word True have to do with anything here?
>
> 'True' is the expression that's evaluated on each iteration of the While
> loop.
>
> while True:
> print('True')
>
> while 1:
> print('True')
>
> while 1==1:
> print('True')
>
> are all equivalent, and will run indefinitely, because the statements
> after the while expression do nothing to stop the loop.
>
>
>
>
> > 2. i=i+1- I never understand this. Why isn't it i=i+2?
>
> i=i+1 adds 1 to the current value of i, then assigns that value to i.
>
> You can increment i by whatever you want:
> i=i+1
> i=i+2
> i=i+35
> etc.
>
>
>
>
> > 3. Do the results not include 2 of 5 because we wrote if i==2 and if i==5?
>
> The print results don't include 2 or 5 because you said 'continue' if 2
> and 'break' if 5. So you skipped over 2, and exited at 5.
>
>
>
>
> > 4. How is i equal to 2 or 5 if i=0?
>
> i=0 before you entered the While loop. Then you increment it by one
> (i=i+1) on each iteration of the loop.
>
>
>
> > Thanks for all of your help!
>
>
> Also, there's a million python resources on the web.
>
> http://www.pythonschool.net/basics/while-loops/
Got it! Thank you!
--
https://mail.python.org/mailman/listinfo/python-list
