The problem seemed to be because I was rebinding result inside
executor. Can someone explain why it works below but not in the first
one?
Also why is it if I set tmp as a global and don't pass it as a
paremeter to the various functions as per the OP that I get an
"UnboundLocalError: local variable 'tmp' referenced before assignment"?
def execute_once(fn):
print "in execute_once"
result = {}
def executor(*args, **kwargs):
if fn not in result:
result[fn] = fn(*args, **kwargs)
return result[fn]
return executor
@execute_once
def execute(tmp):
print "in execute"
tmp = tmp+1
return tmp
def func1(tmp):
return execute(tmp)
def func2(tmp):
return execute(tmp)
tmp = 0
print 'init tmp:', tmp
tmp = func1(tmp)
print 'ran func1 tmp:', tmp
tmp = func2(tmp)
print 'ran func2 tmp:', tmp
tmp = func1(tmp)
print 'ran func1 tmp:', tmp
OUTPUT:
in execute_once
init tmp: 0
in execute
ran func1 tmp: 1
ran func2 tmp: 1
ran func1 tmp: 1
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