Python - 调用Lua
Python 调用Lua
lupa将Lua和LuaJIT2集成进CPython，可以在Python中执行Lua代码.
Lupa的主要特点： - separate Lua runtime states through a LuaRuntime class - Python coroutine wrapper for Lua coroutines - iteration support for Python objects in Lua and Lua objects in Python - proper encoding and decoding of strings (configurable per runtime, UTF-8 by default) - frees the GIL and supports threading in separate runtimes when calling into Lua解决了GIL问题，支持多线程 - tested with Python 2.6/3.2 and later 适用于Python 2.6/3.2以后的版本 - written for LuaJIT2 (tested with LuaJIT 2.0.2), but also works with the normal Lua interpreter (5.1 and 5.2) - easy to hack on and extend as it is written in Cython, not C 扩展性好
1. lupa安装
这里基于Ubuntu14.04. lupa官网提供的教程：
# ForDebian/Ubuntu + Lua 5.2
sudo apt-get install liblua5.2-dev # Install Lua 5.2 development package
sudo pip install lupa # Install lupa
# For Debian/Ubuntu + LuaJIT2
sudo apt-get install libluajit-5.1-dev # Install LuaJIT2 development package
sudo pip install lupa # Install lupa源码安装方式如下：
1.1 安装lua环境
curl -R -O http://www.lua.org/ftp/lua-5.3.4.tar.gz
tar zxf lua-5.3.4.tar.gz
cd lua-5.3.4
make linux test
make install注：如果遇到错误：fatal error: readline/readline.h: No such file or directory，则需要安装readline-dev：
sudo apt-get install libreadline-dev测试是否安装成功： 新建 hellolua.lua脚本，代码如下：
print("Hello Lua!")执行命令：
lua hellolua.lua安装成功，则输出：
Hello Lua!1.2 安装LuaJIT
wget -c http://luajit.org/download/LuaJIT-2.0.5.tar.gz
tar zxf LuaJIT-2.0.5.tar.gz
cd LuaJIT-2.0.5
sudo make install PREFIX=/usr/local/luajit
echo "/usr/local/luajit/lib" > /etc/ld.so.conf.d/usr_local_luajit_lib.conf
sudo ldconfig
export LUAJIT_LIB=/usr/local/luajit/lib
export LUAJIT_INC=/usr/local/luajit/include/luajit-2.01.3 lupa安装
sudo pip install lupa2. 实例
基本用法
import lupa
from lupa import LuaRuntime
lua = LuaRuntime(unpack_returned_tuples=True)
lua.eval('1+1') # output: 2
lua_func = lua.eval('function(f, n) return f(n) end')
def py_add1(n):
return n+1
lua_func(py_add1, 2) # output: 3
lua.eval('python.eval(" 2 ** 2 ")') == 4 # output: True
lua.eval('python.builtins.str(4)') == '4' # output: True
# lua_type(obj) 函数用于输出 type of a wrapped Lua object
lupa.lua_type(lua_func) # output: 'function'
lupa.lua_type(lua.eval('{}')) # output: 'table'
lupa.lua_type(123) is None # output: True
lupa.lua_type('abc') is None # output: True
lupa.lua_type({}) is None # output: True
# flag unpack_returned_tuples=True that is passed to create the Lua runtime
lua.execute('a,b,c = python.eval("(1,2)")')
g = lua.globals()
g.a # output: 1
g.b # output: 2
g.c is None # output: True
# flag unpack_returned_tuples=False, functions that return a tuple pass it through to the Lua code
non_explode_lua = lupa.LuaRuntime(unpack_returned_tuples=False)
non_explode_lua.execute('a,b,c = python.eval("(1,2)")')
g = non_explode_lua.globals()
g.a # output: (1, 2)
g.b is None # output: True
g.c is None # output: True更多用法参考lupa官网.
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