Day 13: Listing again!

 

# Write a program that takes a list of numbers (for example, a = [5, 10, 15, 20, 25])
# and makes a new list of only the first and last elements of the given list.
# For practice, write this code inside a function.

import random


def mainstart():
    testing = int(input("Enter the length of the array: "))
    input_array(testing)


def input_array(testing):
    a = [random.randint(0, 100) for i in range(testing)]
    print("Array: "  + str(a))
    # take_array(a)
    printfirstandlast(testing, a)


def printfirstandlast(testing, a):
    c = []
    for i in range(testing):
        b = a[0]
        c.append(b)
        b = a[-1]
        c.append(b)
        break

    print(c)


mainstart()

Lessons Learned:

1. I need to start practicing regularly. I’m forgetting what I’m learning.
2. If you slice a list and append it, then list of list will be formed and not a simple one. [[num1], [num2]] – Wrong
   Instead [num1, num2] – Correct
3. I was getting continuous error on runtime when I tried running the code only to realise that my last function printfirstandlast I was passing the incorrect variable. So in short when I had to pass two variables, I was only passing one (only the array) and even in my range function I had passed the incorrect variable (the array instead of the length).