0x04.py

"""                                                                                                        
A palindromic number reads the same both ways.                                                             
The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.                     
Find the largest palindrome made from the product of two 3-digit numbers.                                  
"""                                                                                                        
import numpy as np                                                                                         
                                                                                                           
                                                                                                           
def rev(num):                                                                                              
    return int(num != 0) and ((num % 10) * (10 ** int(np.math.log(num, 10))) + rev(num // 10))             
                                                                                                           
                                                                                                           
def palindromicNumber():                                                                                   
    bigList = []                                                                                           
    for i in range(999, 100, -1):                                                                          
        for j in range(999, 100, -1):                                                                      
            x = i * j                                                                                      
            if x == rev(x):                                                                                
                bigList.append(x)                                                                          
                                                                                                           
    return np.max(bigList)                                                                                 
                                                                                                           
                                                                                                           
print("largest palindrome made from the product of two 3-digit number = {}".format(palindromicNumber()))