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python-vobject doesn't support Python3:
skarim/vobject#20

avatars/index.py

@@ -41,3 +41,7 @@ def main():
   options = parser.parse_args(sys.argv[1:])
 
   _populate_index_from_vcard(sys.stdin, dry_run=options.dry_run)
+
+
+if __name__ == "__main__":
+  main()

avatars/lookup.py

@@ -16,8 +16,7 @@ def _lookup(email_address):
 
 def main():
   parser = argparse.ArgumentParser(
-    usage=("%(prog)s --pipe-mail < one_mail.mbox\n"
-           "%(prog)s --email-address FOO@EXAMPLE.COM"),
+    usage="%(prog)s [OPTIONS]",
     description=__doc__)
   parser.add_argument(
     "--pipe-mail", dest="pipe_mail",
@@ -44,4 +43,8 @@ def main():
   elif options.email_address:
     _lookup(options.email_address)
   else:
-    argparse.error("Missing argument.")
+    parser.error("Missing argument.")
+
+
+if __name__ == "__main__":
+  main()

avatars/terminal.py

@@ -17,6 +17,5 @@ def draw_image(filename):
 
     drawing = subprocess.Popen(W3MIMGDISPLAY, stdin=subprocess.PIPE)
     commands = "0;1;%s;%s;%s;%s;;;;;%s\n4;\n3;" % (x, y, w, h, filename)
-    commands = bytes(commands, encoding="utf-8")
     drawing.stdin.write(commands)
     drawing.communicate()