スコープテスト

lua result

% lua scope.lua  
1
2
3

python result

% python scope.py
Traceback (most recent call last):
  File "scope.py", line 9, in <module>
    print(c())
  File "scope.py", line 4, in _counter
    _count = _count + 1
UnboundLocalError: local variable '_count' referenced before assignment

scope.py

def counter():
	_count = 0
	def _counter():
		_count = _count + 1
		return _count
	return _counter

c = counter()
print(c())
print(c())
print(c())

scopy.lua

function counter()
	local _count = 0
	return function()
		_count = _count + 1
		return _count
	end
end

local c = counter()
print(c())
print(c())
print(c())

http://morchin.sakura.ne.jp/effective_python/scope.html