Chris Hengge wrote:
> I thought my solution was the easiest.. but I guess everyone skipped it =P
No, we didn't skip it,
but as we're all programmers here, we showed alternate ways that it
could be done.
Your post is the one that sparked the whole 'garbage collection' thing,
you'll notice.
Now, I don't want to be left out of the loop on this,
and the first thing I thought of when I read his question about how to
read the last line was:
Well, what if he wants to read the last line of 100 20 mb files?
Does he really want to read all of these into memory just to get the
last line?
I wouldn't think so!
So I've made an alternate solution using seek.
The last line can't be more than 1000 chars long, or whatever the Python
maximum recursion depth happens to be at runtime,
but you could easily change this into a non-recursive implementation if
you so desired.
I just wanted to be cool :)
#read_last_line.py
f = file('wii.txt','r')
f.seek(-1,2)#start at end of file.
if f.read(1) == '\n':#if file ends with a newline:
f.seek(-3,1)#start at right before the newline.
else:
f.seek(-1,1)#just start at the end.
def prevchar(fileobj):
achar = fileobj.read(1)
if achar == '\n': return ''
else:
fileobj.seek(-2,1)
return prevchar(fileobj)+achar
print prevchar(f)
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