I know what this does (makes k refer to then actual value instead of last value) but what is this syntax called?
Comes from https://stackoverflow.com/a/215326/2375119
funcs = []
for k in range(10):
funcs.append(lambda k = k: k)
>>> funcs[7]()
7 # not 9
The syntax has no name in particular. It's one of the ways of binding closures to their arguments; Python closures are late binding.
That syntax is a way of strapping the current iteratee value to each lambda by passing it as a default argument when creating the lambda. Since default arguments are evaluated when the function is created, the value sticks to the function.
