Wierd list comprehension and lambda

Question

The code is:

def list_func():
return [lambda x:i*x for i in range(3)]
for f in list_func():
print (f(2), end='')

So, I expect it will print out:
024 as if the list of lambda functions returned from list_func() would be [lambda x:0*x, lambda x:1*x, lambda x:2*x]
But the actual output is 444, it seems that the list of lambda functions is [lambda x:2*x, lambda x:2*x, lambda x:2*x]

The example without lambda:

def list_func():
return [i*2 for i in range(3)]

for f in list_func():
print (f, end='')

Will output 024 as expected.

Anyone could shed some light on why the first example output is 444?

Thanks!

Answer 1

Oh, I found this: https://stackoverflow.com/questions/6076270/JUMP_LINK__&&__python__&&__JUMP_LINK-lambda-function-in-list-comprehensions

Tomasz Gandor answered my question in his post. Turned out this relates to closure.