Question

A file named "numbers.txt" contains an unknown number of lines, each consisting of a single positive integer. Write some code that reads through the file and stores the largest number read in a variable named "maxvalue". Use Python

Answer 1

## ================= maxnumber.py ==============

maxvalue = -1

if __name__ == "__main__":

    with open("numbers.txt") as input_file:
        # This **will not** read whole file into memory but one line at a time. So no memory overhead as number of
        # lines in the file is unknown. When the next line is read, the previous one will be garbage collected

        for line in input_file:
            try:
                number = int(line.strip())
                if number > maxvalue:
                    maxvalue = number
            except Exception as e:
                print("Skipping line because of Exception : {}".format(e.message))

        if maxvalue != -1:
            print("Largest Number found in the file : {}".format(maxvalue))
        else:
            print("Not found !")

## =================== numbers.txt =======================

1
10
10
4
5
8
9
11
12
13
67
7

## =================== output ===================

Largest Number found in the file : 67