"""Rewrite .py files so they are pure ASCII (non-ASCII characters become \\u / \\U escapes)."""
import glob, sys
for f in sys.argv[1:] or glob.glob("*.py"):
    s = open(f, encoding="utf-8").read()
    if all(ord(c) < 128 for c in s):
        continue
    out = "".join(c if ord(c) < 128 else ("\\u%04x" % ord(c) if ord(c) <= 0xFFFF else "\\U%08x" % ord(c)) for c in s)
    open(f, "w", encoding="ascii").write(out)
    print("escaped", f)