What does this print?

funcs = []
for i in range(3):
    funcs.append(lambda x: x * i)
print([f(10) for f in funcs])
# [20, 20, 20]

The lambdas do not capture the value of i. They capture the variable. By the time they are called, the loop has finished and i is 2 for all of them. This is called late binding.

• Bind the current value as a default argument, which is evaluated right when the function is created.
• Call a factory function, so each closure gets its own variable.

def times(n):
    return lambda x: x * n

Comprehensions behave the same way, since each lambda still looks up the name when called.

Fix make_multipliers(n) so it returns a list of n functions where the function at position i multiplies its argument by i.

The explanation opens here once every check passes.