Hi, Travis,
Thanks very much for your help. Since each day, my mail box is flooded with
python forum email. I simply overlooked your email, eventhough I am desperately
waiting for the help. Today when I googled the topic and found your reply.
I am sorry that I send a similar help request to the forum today.
Frank
Date: Tue, 23 Oct 2007 10:08:28 -0400From: [EMAIL PROTECTED]: [EMAIL
PROTECTED]: Re: parsing the output from matlab
On 10/22/07, wang frank <[EMAIL PROTECTED]> wrote
I have a big log file generated from matlabe, for each variable, it print the
name of the variable and an empty line and then the value. such as: x1 =
0.1 y = 7 z = 6.7 x1 = 0.5 I want to use python to parse the file and
selectively print out the vairable and its value. For example, I want to print
out all the value related with x1, so the output will be x1 = 0.1x1 = 0.5.
Here is a fairly naive version with re named groups that should handle the
example you pasted.
In [62]: import re
In [63]: px = re.compile('(?P<variable>\w+)\s=\s+(?P<value>\d.*\d*)')
In [64]: for var in px.finditer(s):
print "%s = %s" %(var.group('variable'), var.group('value'))
....:
....:
a = 0.1
y = 7
z = 6.7
x1 = 0.5
To filter for only the x1's just test for the group named 'variable':
In [66]: for var in px.finditer(s):
....: if var.group('variable')=='x1':
....: print "%s = %s" %(var.group('variable'), var.group('value'))
....:
....:
x1 = 0.5
But I'm betting these files get more complex than just the snippet you
included, in which case it's probably worth looking at pyparsing
http://pyparsing.wikispaces.com/ and regular expressions.
-- Travis Bradyhttp://travisbrady.com/
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