[Tutor] Reading a file

[Alan Gauld]

"David Hutto" <smokefloat at gmail.com> wrote

> In the code below, I'm trying to read from a file, and print out the 
> lines.

Steven addressed that but...

> def increment():
>      for number in range(1, 500):
>          print number ++1

This function if called will print out all of the numbers at once, it 
won't return anything.
I don't think thats what you want. Maybe it was:

def increment()
     for number in range(500)
          yield number + 1       # returns the numbers 1.....500, one 
number per call.

There are better ways to do that but this was the nearest guess
I could make to your possible intent...

> readcont = linecache.getline(outputfile, increment) '''increment is

Here you pass the name of the function increment, I suspect
that you meant to do

readcont = linecache.getline(outputfile, increment() )

where increment was like the generator function above.

However even if you did want to do that using enumerate() would
probably be more effective. So slightly mofdifying Steven's code:

f = open("filename.txt")
for number, line in enumerate(f):
    print "%5d%s" % (number, line)
f.close()


Is that close?


-- 
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/