from scopes import scope

before = "I'll be kept!"

with scope("keep_me", "keep_me_too"):
    keep_me = "Keep me!"
    lose_me = "Not me!"

    keep_me_too = "Also... me!"

assert "before" in locals()
assert "keep_me" in locals()
assert "keep_me_too" in locals()

assert "lose_me" not in locals()