how do you form the largest number possible in python code example

Example 1: Largest number python

# This program will find out the greater number in the arguments

def larger_number(x, y):
    if x > y:
        print(x, "is greater")
    else:
        print(y, 'is greater')

larger_number(12, 31)

Example 2: how to write program in python to get the largest nuber

def max_num_in_list( list ):
    max = list[ 0 ]
    for a in list:
        if a > max:
            max = a
    return max
print(max_num_in_list([1, 2, -8, 0]))