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We need to make sure the function is defined before being used. We have defined the function we are calling so why the error?īecause we are calling the function calculate_nth_term before defining that same function. NameError: name 'calculate_nth_term' is not defined number_of_terms = int(input("How many terms do you want for the sequence? ")) We assign the values to the (n-2)th and (n-1)th terms so we can use them in the next iteration of the while loop to calculate the value of the nth term.
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Assign the value of the nth terms to the (n-1)th terms.Assign the value of the (n-1)th terms to the (n-2)th terms.Calculate the nth term as the sum of the (n-2)th and (n-1)th terms.Here is the meaning of the variables n1, n2 and n: Variable Meaning n nth term of the sequence n1 (n-1)th term of the sequence n2 (n-2)th term of the sequence To simplify things our Python program will print the sequence starting from the number 1. That’s pretty much everything we need to know to create a Python program that generates this sequence. The sequence starts with 0 and 1.īelow you can see the first 10 numbers in the sequence: In the Fibonacci sequence every number is the sum of the two preceding numbers in the sequence. We will go through the creation of a program that prints the Fibonacci sequence and while doing that we will see 4 different ways in which the Python NameError can appear.įirst of all, to understand the program we are creating let’s quickly introduce the Fibonacci sequence. Conclusion A Simple Program to Print the Fibonacci Sequence.Order Really Counts in a Python Program.A Simple Program to Print the Fibonacci Sequence.