# now we will try to query LyX itself to find the path.
extlist = ['']
- if os.environ.has_key("PATHEXT"):
+ if "PATHEXT" in os.environ:
extlist = extlist + os.environ["PATHEXT"].split(os.pathsep)
lyx_exe, full_path = find_exe(["lyxc", "lyx"], extlist, path)
if lyx_exe == None: