How to run some lua from python via ctypes

luapy.py

import ctypes as ct

lua = ct.CDLL('liblua.so.5.2')
lua.luaL_newstate.restype = ct.c_void_p
lua.lua_tolstring.restype = ct.c_char_p

st = lua.luaL_newstate()

def foo(st):
    print(lua.lua_tolstring(st, 1, 0).value.decode())
    return 0
ft = ct.CFUNCTYPE(ct.c_int, ct.c_void_p)
func = ft(foo) # must not be garbage-collected

lua.lua_pushcclosure(st, func, 0)
lua.lua_setglobal(st, b'foo')

lua.luaL_loadstring(st, b'foo("Hello World!")')
lua.lua_pcallk(st, 0, -1, 0, 0, 0)