for i in range(1, 1000+1):
    with open('fibonacci_{0}.txt'.format(i), 'w') as f:
        a = 1
        b = 1
        while a < 10000:
            print(a, file=f)
            a, b = b, a+b


import os

vse_datoteke = os.listdir('.')
# print(vse_datoteke)
for ime in vse_datoteke:
    if ime.startswith('fibonacci_'):
        os.remove(ime)