Bill Burns wrote:
> Hi,
>
> I'm parsing some output from a command that I execute with os.popen.
>
> Here's the typical output from the command:
> [start output]
> TIFF Directory at offset 0x8
>
> Subfile Type: (0 = 0x0)
>
> Image Width: 12000 Image Length: 16800
>
> Resolution: 400, 400 pixels/inch
>
> Bits/Sample: 1
>
> Compression Scheme: CCITT Group 4
>
> Photometric Interpretation: min-is-white
>
> Samples/Pixel: 1
>
> Rows/Strip: 16800
>
> Planar Configuration: single image plane
>
> DocumentName: buzzsaw.com
> [end output]
>
> I need to return the size (width & length) in inches of the Tiff. So I
> need the information on lines:
>
> Image Width: 12000 Image Length: 16800
> Resolution: 400, 400 pixels/inch
>
> Example: 12000 / 400 = 30 & 16800 / 400 = 42, so the Tiff is 30" x 42".
>
> def getTiffWidthLength():
> tmp = []
> s = []
> r = []
> for line in os.popen(command).readlines():
> if line.startswith(' Image Width:') or \
> line.startswith(' Resolution:'):
> tmp.append(line.strip(' \n'))
> s.append(tmp[0])
> r.append(tmp[1])
> for wl in s:
> size = p.findall(wl)
> for i in r:
> res = p.findall(i)
> width = int(size[0]) / int(res[0])
> length = int(size[1]) / int(res[1])
> print (width, length)
>
> if __name__ == '__main__':
> getTiffWidthLength()
> [end code]
I would process the data as I find it rather than use all the helper lists. The
data format is simple enough that str.split() can be used to extract it. I used
float() instead of int() so it will get the correct answer when the dimensions
are not whole inches. Something like this:
def getTiffWidthLength():
for line in os.popen(command).readlines():
if line.startswith(' Image Width:'):
data = line.strip().split()
rawWidth = float(data[2])
rawLength = float(data[5])
elif line.startswith(' Resolution:'):
data = line.strip().split()
wRes = float(data[1][1:])
lRes = float(data[2])
width = rawWidth / wRes
length = rawLength / lRes
print width, length
Kent
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
