"Leetcode" 415. Add Strings "E"

Given two non-negative numbers NUM1 and num2 represented as String, return the sum of NUM1 and num2.

Note:the length of both NUM1 and num2 is < 5100. Both Num1 and num2 contains only digits 0-9. Both NUM1 and num2 does not contain any leading zero. You are must not with any built-in BigInteger library or convert the inputs to integer directly.

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This is a straightforward one, and the last line of comments is a handy python integer type.
The total feeling program where write a bit ugly ~ ~ ~ ~

Class Solution (object):
    def addstrings (self, NUM1, num2):

        l1 = Len (num1)
        L2 = Len (num2)

        lmin = min (l1,l2
        Lmax = max (L1,L2)

        res = [0] * (lmax+1)
        #print res for

        i in Xrange (1,lmin+1):
            res[-i] = Int (num1[-i)) + int (num2[-i])
            #print i,res

        if L1 > L2: For
            i in Xrange (lmin+1,lmax+1):
                res[-i] = Int (num1[-i)) 
  else: For
            i-xrange (lmin+1,lmax+1):
                res[-i] = Int (num2[-i)) for

        I in Xrange (1,lmax+1):
            If Res [I] > 9:
                res[-i] =
                Res[-i-1] + = 1
        rres = ' for

        i in res:
            rres + = str (i)
        if rres[0] = = ' 0 ':
            rres = rres[1:] return
        rres


        #return str (int (NUM1) + int (num2))