Closure Trap

The function make_multipliers(n) should return a list of n functions, where the i-th function multiplies its argument by i.

So make_multipliers(4)[2](5) should return 10 (2 × 5). But every single function in the list behaves identically — they all multiply by the same number.

This is one of Python's most infamous gotchas. The code looks right. But it isn't.

# your fix

+ must use lambda

+ must use for

hint 2after hint 1

hint 3after hint 2

solution

Read the code. Before running anything: what does the last line below give?

def make_multipliers(n):

multipliers = []

for i in range(n):

multipliers.append(lambda x: x * i)

return multipliers

>>> make_multipliers(3)[0](10)