On Nov 4, 12:18 am, Cameron Walsh <[EMAIL PROTECTED]> wrote:
> Tom_chicollegeboy wrote:
> > <snip!>
>
> > Here is my code:
>
> > def speed():
> > infile = open('speed.in', 'r')
> > line = infile.readline()
> > read = int(line)
> > print line
> > i = 0
> > t0 = 0
> > v = 0
>
> > while i<read:
> > line = infile.readline()
> > list = line.split()
> > s = int(list[0])
> > t1 = int(list[1])
> > t = t1- t0
> > v += s*t
> > i+=1
> > t0 = t1
> > print v
>
> > It works only for first set. How should I implement another solution
> > that would move program to read next set? I think I should implement
> > nested while look, with first that reads until -1 and under it another
> > while loop that reads n times sets. But I have no idea how. Can you
> > help me?
>
> Clues:
>
> 1.) Your program works for one block. As you suggested you now need to
> loop over some of your code until you reach an end condition.
> 2.) The end condition has been given to you already in the text and the
> file.
> 3.) This can be done with two more lines of code. One line to add a
> loop of some sort, checking for the end condition; and one line which
> brings you closer to the end condition after each block, and prepares
> you for the next block.
>
> I hope this has given you enough to go on without confusing you or
> giving you the answer outright.
>
> Now a few general pointers unrelated to your assignment:
>
> 1.) list is a keyword in python. Don't call your variables list.
> 2.) You've left the file open at the end of your program. Yes, Python
> will close it once the program has finished, but it's good practice to
> close it yourself as soon as you've finished with it. This won't be a
> problem in this assignment, but it may be in later assignments.- Hide quoted
> text -
>
> - Show quoted text -
thanks. Python actually allows to replace its built-in functions with
code defined by user inside line. I do not think list() is one of they
keyword like if or while. For example, that can be done with
reverse().
The answer what I am looking is how to make python continue to go to
next block until -1. I am not asking for code, only what algorithm
should do. But thank you anyway.
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