[Python] Python Fibonacci Generator

I need to make a program that asks for the amount of Fibonacci numbers printed and then prints them like 0, 1, 1, 2... but I can't get it to work. My code looks the following:

a = int(raw_input('Give amount: '))

def fib():
a, b = 0, 1
while 1:
yield a
a, b = b, a + b

a = fib()
a.next()
0
for i in range(a):
print a.next(),

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