Python Program to Print Fibonacci Series
mediumLoopsPython
In the Fibonacci series each term is the sum of the two before it: 0, 1, 1, 2, 3, 5, 8 …
The question
Read n and print the first n terms of the Fibonacci series, starting 0 1 1 2 3 …, on one line separated by spaces.
The code
program.py
n = int(input())
a, b = 0, 1
for _ in range(n):
print(a, end=" ")
a, b = b, a + b
print()Input
10
Output
0 1 1 2 3 5 8 13 21 34
How it works
- 1Keep the last two terms in a and b, starting with 0 and 1.
- 2Print a, then move forward with a, b = b, a + b — both values change at the same moment.
- 3end=" " keeps all the terms on one line; the final print() ends that line.
Common mistakes
- Updating in two lines (a = b then b = a + b) — a has already changed, so the series goes wrong.
- Starting from 1 1 when the question starts the series at 0.
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