On Jul 18, 3:35 pm, Nick Dumas <[EMAIL PROTECTED]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I think you're over-complicating this. I'm assuming that you're going to > do a line graph of some sorta, and each new line of the file contains a > new set of data. > > The problem you mentioned with your regex returning a match object > rather than a string is because you're simply using a re function that > doesn't return strings. re.findall() is what you want. That being said, > here is working code to mine data from your file. > > [code] > line = 'c afrac=.7 mmom=0 sev=-9.56646 erep=0 etot=-11.020107 > mad=-3.597647 3pv=0' > > energypat = r'\betot=(-?\d*?[.]\d*)' > > #Note: To change the data grabbed from the line, you can change the > #'etot' to 'afrac' or 'emad' or anything that doesn't contain a regex > #special character. > > energypat = re.compile(energypat) > > re.findall(energypat, line)# returns a STRING containing '-12.020107' > > [/code] > > This returns a string, which is easy enough to convert to an int. After > that, you can datapoints.append() to your heart's content. Good luck > with your work. > > > > [EMAIL PROTECTED] wrote: > > Hello, > > > I am new to Python, with a background in scientific computing. I'm > > trying to write a script that will take a file with lines like > > > c afrac=.7 mmom=0 sev=-9.56646 erep=0 etot=-11.020107 emad=-3.597647 > > 3pv=0 > > > extract the values of afrac and etot and plot them. I'm really > > struggling with getting the values of efrac and etot. So far I have > > come up with (small snippet of script just to get the energy, etot): > > > def get_data_points(filename): > > file = open(filename,'r') > > data_points = [] > > while 1: > > line = file.readline() > > if not line: break > > energy = get_total_energy(line) > > data_points.append(energy) > > return data_points > > > def get_total_energy(line): > > rawstr = r"""(?P<key>.*?)=(?P<value>.*?)\s""" > > p = re.compile(rawstr) > > return p.match(line,5) > > > What is being stored in energy is '<_sre.SRE_Match object at > > 0x2a955e4ed0>', not '-11.020107'. Why? I've been struggling with > > regular expressions for two days now, with no luck. Could someone > > please put me out of my misery and give me a clue as to what's going > > on? Apologies if it's blindingly obvious or if this question has been > > asked and answered before. > > > Thanks, > > > Nicole > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (MingW32) > Comment: Using GnuPG with Mozilla -http://enigmail.mozdev.org > > iEYEARECAAYFAkiAqiAACgkQLMI5fndAv9h7HgCfU6a7v1nE5iLYcUPbXhC6sfU7 > mpkAn1Q/DyOI4Zo7QJhF9zqfqCq6boXv > =L2VZ > -----END PGP SIGNATURE-----
Thanks guys :-) -- http://mail.python.org/mailman/listinfo/python-list
