fibonacci_sequence.py

import sys

def main():

    line = sys.stdin.readline()
    printFibonacci(line)


def printFibonacci(memberCount):

    if isInt(memberCount):

        memberCount = int(memberCount)
        previous = 0
        current = 1
        tmp = 0

        for i in range(0, memberCount, 1):
            print(previous)
            tmp = previous
            previous = current
            current = previous + tmp

    else:
        print("Not a valid input!")


def isInt(x):
    try:
        int(x)
        return True
    except ValueError:
        return False



if __name__ == '__main__':
    main()