Fabian Braennstroem wrote:
> I would like to delete a region on a log file which has this
> kind of structure:
>
>
> #------flutest------------------------------------------------------------
> 498 1.0086e-03 2.4608e-04 9.8589e-05 1.4908e-04
> 8.3956e-04 3.8560e-03 4.8384e-02 11:40:01 499
> 499 1.0086e-03 2.4608e-04 9.8589e-05 1.4908e-04
> 8.3956e-04 3.8560e-03 4.8384e-02 11:40:01 499
> reversed flow in 1 faces on pressure-outlet 35.
>
> Writing
> "/home/gcae504/SCR1/Solververgleich/Klimakruemmer_AK/CAD/Daimler/fluent-0500.cas"...
> 5429199 mixed cells, zone 29, binary.
> 11187656 mixed interior faces, zone 30, binary.
> 20004 triangular wall faces, zone 31, binary.
> 1104 mixed velocity-inlet faces, zone 32, binary.
> 133638 triangular wall faces, zone 33, binary.
> 14529 triangular wall faces, zone 34, binary.
> 1350 mixed pressure-outlet faces, zone 35, binary.
> 11714 mixed wall faces, zone 36, binary.
> 1232141 nodes, binary.
> 1232141 node flags, binary.
> Done.
>
>
> Writing
> "/home/gcae504/SCR1/Solververgleich/Klimakruemmer_AK/CAD/Daimler/fluent-0500.dat"...
> Done.
>
> 500 1.0049e-03 2.4630e-04 9.8395e-05 1.4865e-04
> 8.3913e-04 3.8545e-03 1.3315e-01 11:14:10 500
>
> reversed flow in 2 faces on pressure-outlet 35.
> 501 1.0086e-03 2.4608e-04 9.8589e-05 1.4908e-04
> 8.3956e-04 3.8560e-03 4.8384e-02 11:40:01 499
>
> #------------------------------------------------------------------
>
> I have a small script, which removes lines starting with
> '(re)versed', '(i)teration' and '(t)urbulent' and put the
> rest into an array:
>
> # -- plot residuals ----------------------------------------
> import re
> filename="flutest"
> reversed_flow=re.compile('^\ re')
> turbulent_viscosity_ratio=re.compile('^\ tu')
> iteration=re.compile('^\ \ i')
>
> begin_of_res=re.compile('>\ \ \ i')
> end_of_res=re.compile('^\ ad')
The following regular expressions have some extra backslashes
which change their meaning:
> begin_of_writing=re.compile('^\Writing')
> end_of_writing=re.compile('^\Done')
But I don't think you need regular expressions at all.
Also, it's better to iterate over the file just once because
you don't need to remember the position of regions to be skipped.
Here's a simplified demo:
def skip_region(items, start, end):
items = iter(items)
while 1:
for line in items:
if start(line):
break
yield line
else:
break
for line in items:
if end(line):
break
else:
break
def begin(line):
return line.strip() == "Writing"
def end(line):
return line.strip() == "Done."
# --- begin demo setup (remove to test with real data) ---
def open(filename):
from StringIO import StringIO
return StringIO("""\
iteration # to be ignored
alpha
beta
reversed # to be ignored
Writing
to
be
ignored
Done.
gamma
delta
""")
# --- end demo setup ---
if __name__ == "__main__":
filename = "fluetest"
for line in skip_region(open(filename), begin, end):
line = line.strip()
if line and not line.startswith(("reversed", "iteration")):
print line
skip_region() takes a file (or any iterable) and two functions
that test for the begin/end of the region to be skipped.
You can nest skip_region() calls if you have regions with different
start/end conditions.
Peter
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