Python to lua converter

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Simple python to lua translator.

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dmitrii-eremin/python-lua

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README.md

Python 3 to lua translator

Python version: 3.5
Lua version: 5.2

I want to know more about FEATURES!

As a standalone application

usage: python-lua [-h] [--show-ast] [--only-lua-init] [--no-lua-init] [IF] Python to lua translator. positional arguments: IF A python script filename to translate it. optional arguments: -h, --help show this help message and exit --show-ast Print python ast tree before code. --only-lua-init Print only lua initialization code. --no-lua-init Print lua code without lua init code. 

For example: python3 __main__py tests/iterlist.py

from pythonlua.translator import Translator . translator = Translator() lua_code = translator.translate(python_code) 

For example see runtests.py .

This translator defines some python functions in lua ( len , range , enumerate , list , dict and other). For list and dict it also defines most methods like append() for list and items() for dict . You can find this definitions in the file pythonlua/luainit.lua. Also this definitions will be in the output, when you run translator as a standalone application.

(venv) ******@****:~/Projects/python/python-lua$ python3 __main__.py tests/del.py local string_meta = getmetatable("") string_meta.__add = function(v1, v2) if type(v1) == "string" and type(v2) == "string" then return v1 .. v2 end return v1 + v2 end local str = tostring local int = tonumber local function len(t) return #t end local function range(from, to, step) assert(from ~= nil) if to == nil then to = from from = 1 end if step == nil then step = to > from and 1 or -1 end local i = from return function() ret = i if (step > 0 and i > to) or (step < 0 and i < to) then return nil end i = i + step return ret end end local function list(t) local methods = <>methods.append = function(value) table.insert(t, value) end local iterator_index = nil setmetatable(t, < __index = function(self, index) if type(index) == "number" and index < 0 then return rawget(t, #t + index + 1) end return methods[index] end, __call = function(self, _, idx) if idx == nil and iterator_index ~= nil then iterator_index = nil end local v = nil iterator_index, v = next(t, iterator_index) return v end, >) return t end function dict(t) local methods = <> methods.items = function() return pairs(t) end local key_index = nil setmetatable(t, < __index = methods, __call = function(self, _, idx) if idx == nil and key_index ~= nil then key_index = nil end key_index, _ = next(t, key_index) return key_index end, >) return t end function enumerate(t, start) start = start or 1 local i, v = next(t, nil) return function() local index, value = i, v i, v = next(t, i) if index == nil then return nil end return index + start - 1, value end end local a, b, c = 1, 2, 3 print(a, b, c) a, b = nil, nil print(a, b, c) c = nil print(a, b, c) 

Insert lua code in the python

You can start your string with the tag [[luacode]] to simply insert lua code in the python. For example,

def get_summ(a, b): return a + b print(get_summ(3, 5)) """[[luacode]] local c = 45 print(c) """ 

local function get_summ(a, b) return (a + b) end print(get_summ(3, 5)) local c = 45 print(c) 

print(5 + 3) print(18 - 2) print(5 * 5) print(64 / 2) print(11 ** 2) print(11 // 2) print(11 / 2) print(((5 + 34) ** 2 / 53) * (24 - 6 * 3)) 

print((5 + 3)) print((18 - 2)) print((5 * 5)) print((64 / 2)) print((math.pow(11, 2))) print((math.floor(11 / 2))) print((11 / 2)) print((((math.pow((5 + 34), 2)) / 53) * (24 - (6 * 3)))) 

a = 0xFA23423 b = 0xAC23BD2 c = 0x548034D print(a & b) print((a & b) | c) print(~((a & b) | c)) 

local a = 262288419 local b = 180501458 local c = 88605517 print((bit32.band(a, b))) print((bit32.bor((bit32.band(a, b)), c))) print(bit32.bnot((bit32.bor((bit32.band(a, b)), c)))) 

Function definitions with variable arguments number and default arguments

def hello(name, age=20, nickname="", *args): print("Hello, my name is " + name + " and I'm " + str(age)) print("My nickname is " + nickname) print(*args) hello("John", 12, "antikiller") hello("Josh", 45) hello("Jane") 

local function hello(name, age, nickname, . ) age = age or 20 nickname = nickname or "" local args = list print(((("Hello, my name is " + name) + " and I'm ") + str(age))) print(("My nickname is " + nickname)) print(unpack(args)) end hello("John", 12, "antikiller") hello("Josh", 45) hello("Jane") 

def strong(old_fun): def wrapper(*args): s = "" + old_fun(*args) + "" return s return wrapper def italic(old_fun): def wrapper(*args): s = "" + old_fun(*args) + "" return s return wrapper @italic @strong def hello(name): return "Hello, " + name + "!" print(hello("John")) 

local function strong(old_fun) local function wrapper(. ) local args = list local s = (("" + old_fun(unpack(args))) + "") return s end return wrapper end local function italic(old_fun) local function wrapper(. ) local args = list local s = (("" + old_fun(unpack(args))) + "") return s end return wrapper end local function hello(name) return (("Hello, " + name) + "!") end hello = strong(hello) hello = italic(hello) print(hello("John")) 

If/elif/else, for and while loops

a = 45 b = 0 if a > 5 and b < 34: print("a >5") if a >= 45: print("a >= 45") else: print("a < 45") elif a < 5: print("a < 5") else: print("a == 5") if a == 45: print("a == 45") x = 100 if 50 < x < 150: print("50 < x < 150") else: print("Something wrong.") i = 10 while i >0: print(i) i -= 1 

local b = 0 if ((a > 5) and (b < 34)) then print("a >5") if (a >= 45) then print("a >= 45") else print("a < 45") end elseif (a < 5) then print("a < 5") else print("a == 5") end if (a == 45) then print("a == 45") end local x = 100 if (50 < x and x < 150) then print("50 < x < 150") else print("Something wrong.") end local i = 10 while (i >0) do print(i) i = (i - 1) end 

def factorial(value): return 1 if value == 0 else value * factorial(value - 1) print(factorial(5)) print(factorial(10)) print(factorial(3)) print(factorial(0)) 

local function factorial(value) return (value == 0) and 1 or (value * factorial((value - 1))) end print(factorial(5)) print(factorial(10)) print(factorial(3)) print(factorial(0)) 

a = [1, 2, 5] b = [ [1, 2, 3], [4, 5, 6], [7, 8, 9], ] c = < "firstname": "John", "lastname": "Doe", "age": 42, "children": [ < "name": "Sara", "age": 4, >, ], > print(a[2]) print(b[1][2]) print(c["firstname"], c["lastname"]) ch = c["children"][1] print(ch["name"], ch["age"]) 

local a = list local b = list , list , list > local c = dict >> print(a[2]) print(b[1][2]) print(c["firstname"], c["lastname"]) local ch = c["children"][1] print(ch["name"], ch["age"]) 

import foo.bar import bar as bar_ex 

local bar = require "foo.bar" local bar_ex = require "bar" 

sqr = lambda x: x * x print(sqr(2)) print(sqr(8)) 

local sqr = function(x) return (x * x) end print(sqr(2)) print(sqr(8)) 

a, b, c = 1, 2, 3 print(a, b, c) del a, b print(a, b, c) del c print(a, b, c) 

local a, b, c = 1, 2, 3 print(a, b, c) a, b = nil, nil print(a, b, c) c = nil print(a, b, c) 

Python list and dictionary comprehensions

a = [i * j for i in range(5) for j in range(3) if i * j % 2 == 0 and i > 0 and j > 0] for item in a: print(item) b = for k, v in b.items(): print(k, v) 

local a = (function() local result = list <> for i in range(5) do for j in range(3) do if (((math.fmod((i * j), 2)) == 0) and (i > 0)) then result.append((i * j)) end end end return result end)() for item in a do print(item) ::loop_label_1:: end local b = (function() local result = dict <> for i in range(5) do result[i] = (math.pow(i, 2)) end return result end)() for k, v in b.items() do print(k, v) ::loop_label_2:: end 

class Animal: PLANET = "Earth" def __init__(self, name): self.name = name def say_hello(self): print("Hello, my name is: " + self.name + "!") class Dog(Animal): def say_hello(self): print("Hello, my name is: " + self.name + "!") self.bark() def bark(self): print("Bark! Bark! Bark!") sparky = Animal("Sparky") barky = Dog("Barky") sparky.say_hello() barky.say_hello() barky.bark() print("Animal.PLANET = ", Animal.PLANET) print("sparky.PLANET = ", sparky.PLANET) print("barky.PLANET = ", barky.PLANET) Animal.PLANET = "Mars" print("Animal.PLANET = ", Animal.PLANET) print("sparky.PLANET auto">Lua code:
 ) local Dog = class(function(Dog) function Dog.say_hello(self) print((("Hello, my name is: " + self.name) + "!")) self.bark() end function Dog.bark(self) print("Bark! Bark! Bark!") end return Dog end, ) local sparky = Animal("Sparky") local barky = Dog("Barky") sparky.say_hello() barky.say_hello() barky.bark() print("Animal.PLANET = ", Animal.PLANET) print("sparky.PLANET = ", sparky.PLANET) print("barky.PLANET = ", barky.PLANET) Animal.PLANET = "Mars" print("Animal.PLANET = ", Animal.PLANET) print("sparky.PLANET = ", sparky.PLANET)">
local Animal = class(function(Animal) Animal.PLANET = "Earth" function Animal.__init__(self, name) self.name = name end function Animal.say_hello(self) print((("Hello, my name is: " + self.name) + "!")) end return Animal end, <>) local Dog = class(function(Dog) function Dog.say_hello(self) print((("Hello, my name is: " + self.name) + "!")) self.bark() end function Dog.bark(self) print("Bark! Bark! Bark!") end return Dog end, ) local sparky = Animal("Sparky") local barky = Dog("Barky") sparky.say_hello() barky.say_hello() barky.bark() print("Animal.PLANET = ", Animal.PLANET) print("sparky.PLANET = ", sparky.PLANET) print("barky.PLANET = ", barky.PLANET) Animal.PLANET = "Mars" print("Animal.PLANET = ", Animal.PLANET) print("sparky.PLANET -1" dir="auto"> Loops continue statement 
Python code:
 
for i in range(10): if i == 5: continue for j in range(10): if j == 7: continue print(i, " * ", j, " auto">Lua code:
 
for i in range(10) do if (i == 5) then goto loop_label_1 end for j in range(10) do if (j == 7) then goto loop_label_2 end print(i, " * ", j, " -1" dir="auto"> Operators in and not in 
Python code:
 c = "Hello, world!" if 2 < 3: print("2 < 3") print(1 in a) print(2 in a) print(5 in a) print("name" in b) print("surname" in b) print("Hell" in c) print("world" in c) print("Foo" in c) print("Hells" not in c)">
a = [1, 2, 3, 4] b = < "name": "John", "age": 42, >c = "Hello, world!" if 2 < 3: print("2 < 3") print(1 in a) print(2 in a) print(5 in a) print("name" in b) print("surname" in b) print("Hell" in c) print("world" in c) print("Foo" in c) print("Hells" not in c) 
 
local a = list local b = dict local c = "Hello, world!" if (2 < 3) then print("2 < 3") end print((operator_in(1, a))) print((operator_in(2, a))) print((operator_in(5, a))) print((operator_in("name", b))) print((operator_in("surname", b))) print((operator_in("Hell", c))) print((operator_in("world", c))) print((operator_in("Foo", c))) print((not operator_in("Hells", c))) 
 
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Python to lua converter
 
This free online converter lets you convert code from Python to Lua in a click of a button. To use this converter, take the following steps -
 
 
Type or paste your Python code in the input box.
 
Click the convert button.
 
The resulting Lua code from the conversion will be displayed in the output box.
 
 
Key differences between Python and Lua
 
 
 
Characteristic
 
Python
 
Lua
 
  
 
 
Syntax
 
Python has a simple and easy-to-learn syntax that emphasizes readability and reduces the cost of program maintenance. It uses indentation to create blocks and does not require semicolons to end statements.
 
Lua has a simple and flexible syntax that is easy to learn. It uses keywords and punctuation marks to structure code and has a C-like syntax.
 
 
 
Paradigm
 
Python supports multiple programming paradigms, including object-oriented, imperative, and functional programming.
 
Lua is a multi-paradigm language that supports procedural, functional, and object-oriented programming.
 
 
 
Typing
 
Python is dynamically typed, which means that variable types are determined at runtime.
 
Lua is dynamically typed, which means that variable types are determined at runtime.
 
 
 
Performance
 
Python is an interpreted language and is generally slower than compiled languages. However, it has a large number of libraries and frameworks that can help improve performance.
 
Lua is a lightweight language that is designed for performance. It is often used in embedded systems and video games.
 
 
 
Libraries and frameworks
 
Python has a large number of libraries and frameworks for a wide range of applications, including web development, scientific computing, and machine learning.
 
Lua has a smaller number of libraries and frameworks compared to Python, but it has a strong focus on game development and embedded systems.
 
 
 
Community and support
 
Python has a large and active community of developers and users, which means that there is a lot of support available online.
 
Lua has a smaller community compared to Python, but it is still active and has a number of dedicated users and developers.
 
 
 
Learning curve
 
Python has a relatively easy learning curve, especially for beginners. Its simple syntax and large number of libraries and frameworks make it a popular choice for new programmers.
 
Lua has a relatively easy learning curve, but it may be more challenging for beginners due to its focus on game development and embedded systems.
 
 
 
 
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