Fibonacci sequence generator

fib.py

from optparse import OptionParser
parser = OptionParser()

parser.add_option("-c",
                  "--count",
                  dest="count",
                  help="how many?.",
                  default=10
                  )
(options, args) = parser.parse_args()

def gen_fib(limit):
    i,a,b = 0,0,1
    while i <= limit:
        yield a
        i,a,b = i+1,b,a+b
        
generator = gen_fib(options.count);
for i in generator:
    print i

fib2.py

# or you could do something like this
# source: http://stackoverflow.com/questions/3953749/python-fibonacci-generator

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

# the generator is infinite, so you can just call next()
f = genFib()
x = []
for i in range(20):
    print f.next()
    

Lessons learned about Python during a technical interview