Calling a function for multiple times in Python (II)

Certainly, you can find more than one way to run a function for multiple times to perform a task in Python (and other languages). Here I am just going to use the same approach as in [Calling a function for multiple times in Python (I)] (https://hhsieh.github.io/calling-function-multiple-times/).

Let’s start with a question.

You have a series of numbers: 3, 4, 5, 7, 9, 12, 15… What will be the Nth number (N >= 1)?

Carefully looking at the series of the numbers, you may find it increases in the pattern 1, 1, 2, 2, 3, 3, …., in each step. we can write a function to reflect this pattern and find the value of the Nth number.

def series(N):
    if N % 2 == 0:
        print 3 + (1 + N / 2) * (N / 2) - (N /2)
    else:
        print 3 + (1 + N / 2) * (N / 2)

Now, assume we need to find the 48th number. We simply do

seris(48)

It will give us 579.

We can ask for the values of a sequence, for instance, from the 60th to the 84th numbers.

for N in range(60, 85):
    series(N)

It gives us:

Written on November 25, 2016