import json

with open(".local/share/orca/user-settings.conf", 'r') as fil:
    var = json.load(fil)

if u'Insert' in var["general"]["orcaModifierKeys"]:
    print "change!"
    var["general"]["orcaModifierKeys"] = [u'Caps_Lock']
elif u'Caps_Lock' in var["general"]["orcaModifierKeys"]:
    var["general"]["orcaModifierKeys"] = [u'Insert', u'KP_Insert']

# To verify by hand
#print var["general"]["orcaModifierKeys"]

with open("/home/ksamak/.local/share/orca/user-settings.conf", 'w') as fil:
    json.dump(var, fil, indent = 4)