I m a beginning python programmer, and I d like someone to clarify the following behavior.
I have the following code:
env = lambda id: -1
def add(id, val, myenv):
return lambda x: val if x == id else myenv(id)
test_env = add("a", 1, env)
test_env_2 = add("b", 2, test_env)
When I look up "a" in test_env, it functions correctly, but when I look it up in test_env_2 it seems to have been clobbered by "b". At least, "b" is all I can retrieve from test_env_2.
So, I have already read Scope of python lambda functions and their parameters et al and understand that closures operate on references rather than values, but I believe this is not the exact same case since I am using string literals. Can someone explain to me what is going on under the hood here?
(And yes, I know that Python isn t intended as a functional language. This is just research.)