Fibonacci Sequence in Python

How to calculate Fibonacci sequence in Python.

Create a file called fib.py.

nterms = int(input("How many terms? "))
n1, n2 = 0, 1
count = 0
if nterms <= 0:
    print("Please enter a positive integer")
elif nterms == 1:
    print("Fibonacci sequence:")
    print(n1)
else:
    print("Fibonacci sequence:")
    while count < nterms:
        print(n1)
        nth = n1 + n2
        # update values
        n1 = n2
        n2 = nth
        count += 1

Run it.

$ python fib.py
How many terms? 5
Fibonacci sequence:
0
1
1
2
3

Again.

$ python fib.py
How many terms? 10
Fibonacci sequence:
0
1
1
2
3
5
8
13
21
34

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