skip item in list "for loop"

[Jacob Rael]

I am new to python and I love it. I am hacking a file. I want to not
print a line if it contains the word 'pmos4_highv'. I also don't want
to print the next line. The following code works but it "smells bad"
and just doesn't look right. I was reading about generators. If I was
using one, I could do a .next() after the match and get rid of the
flags. Any suggestions how I can improve this?


inPmos = False

inFile = sys.stdin
fileList = inFile.readline s()

for line in fileList:
line = line.rstrip()
# Remove PMOS definitions - typically two lines. Screwed if only
one and last inst.
if inPmos:
inPmos = False
continue
if 'pmos4_highv' in line:
inPmos = True
continue


jr

[Diez B. Roggisch]

Re: skip item in list "for loop"

Jacob Rael schrieb:[color=blue]
> I am new to python and I love it. I am hacking a file. I want to not
> print a line if it contains the word 'pmos4_highv'. I also don't want
> to print the next line. The following code works but it "smells bad"
> and just doesn't look right. I was reading about generators. If I was
> using one, I could do a .next() after the match and get rid of the
> flags. Any suggestions how I can improve this?[/color]

A generator certainly would be handy:

def read_lines(inFi le):
fg = iter(inFile)
for line in fg:
if "pmos4_high v" in line:
fg.next()
else:
yield line



lines = """a
b
c
d
pmos4_highv
no no!
e
f
g""".split("\n" )


for line in read_lines(line s):
print line


Diez

[Felipe Almeida Lessa]

Re: skip item in list "for loop"

Em Sex, 2006-04-14 às 20:33 +0200, Diez B. Roggisch escreveu:[color=blue]
> def read_lines(inFi le):
> fg = iter(inFile)
> for line in fg:
> if "pmos4_high v" in line:
> fg.next()
> else:
> yield line[/color]

Just be aware that the "fb.next()" line can raise an StopIteration
exception that would otherwise be caught by the for loop. If you have
any resources that need to be cleaned up, try...finally is you friend.

--
Felipe.

[Diez B. Roggisch]

Re: skip item in list "for loop"

Felipe Almeida Lessa schrieb:[color=blue]
> Em Sex, 2006-04-14 às 20:33 +0200, Diez B. Roggisch escreveu:[color=green]
>> def read_lines(inFi le):
>> fg = iter(inFile)
>> for line in fg:
>> if "pmos4_high v" in line:
>> fg.next()
>> else:
>> yield line[/color]
>
> Just be aware that the "fb.next()" line can raise an StopIteration
> exception that would otherwise be caught by the for loop. If you have
> any resources that need to be cleaned up, try...finally is you friend.[/color]

Actually I did that on purpose - as the StopIteration would simply end
the generator. Any clean-up - well, if that was the scope of the
generator on could add it of course, but I'd do that on the same level
the file has been opened.

Regards,

Diez

[Jacob Rael]

Re: skip item in list "for loop"

Thanks for the suggestions.
The solution I liked most was to prevent the lines from appearing in
the first place!!