A little gist that will comment out all but a single wpa config in a wpa_supplicant.conf (pass part of the SSID as an arg to the script)

gistfile1.txt

#!/usr/bin/env python
lines = open('/etc/wpa_supplicant/wpa_supplicant.conf').readlines()
groups = [[]]
for line in lines:
    if line[0] != '#':
        line = '#' + line
    groups[-1] += [ line ]
    if '}' in line:
        groups += [[]]
groups += [[]]
import sys, itertools
for net in groups:
   if sys.argv[1] in ''.join(net):
    groups.remove(net)
    for line in net:
        while line[0] == '#':
            line = line[1:]
        groups[-1] += [line]
    print(''.join(groups[-1]))
with open('/etc/wpa_supplicant/wpa_supplicant.conf','w') as w:
  w.writelines(itertools.chain(*groups))