Python screening questions

gistfile1.py

def powers():
    return [lambda x : x ** i for i in range(3)]
print [m(5) for m in powers()]  # Produces [25, 25, 25]

# What would you change to get the expected [1, 5, 25] results?

def powers():
    for i in range(3): yield lambda x : x ** i
print [m(5) for m in powers()]