A sequence is called Fibonacci sequence if each number is the sum of the two preceding ones, starting from 0 and 1.

Steps followed:
1. take length of fibonacci series as input from user
2. validate user input by converting to integer
3. print fibonacci series using for loop

Program

#python program to print fibonacci series of given length

#take length of fibonacci series as input from user

length=input("length of fibonacci series: ")

try:

    length=int(length)

    i = 0

    j = 1

    print(i, end = " ")

    print(j, end = " ")

    

    #print fibonacci series

    for x in range(0,length-2):

        step = i + j

        print(step, end = " ")

        i = j

        j = step

        

except:

    print("---error---")

    print("please enter a valid length")

Output

length of fibonacci series: 10

0 1 1 2 3 5 8 13 21 34

 

length of fibonacci series: 20

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181

► Python program to print fibonacci series of given length