Evaluate Operations

def evaluate(numbers, operators):
    ln=len(numbers); lo=len(operators) #length of list numbers operators
    answer,i,j=0,1,0 #initalize answer, index i & j to zero

#number of operations will be ln-1, so we append the list operators to match the operations
    while (ln-lo)>1: 
        operators.append(operators[j]); #append the list operators on left to right basis 
        j+=1;             #increment index j
        lo=len(operators) #update the length of operators

#perform operations left to right in the list operators
    for ops in operators:
        if ops=='+':    answer=numbers[i-1]+numbers[i]; 
        elif ops=='-':  answer=numbers[i-1]-numbers[i]; 
        elif ops=='*':  answer=numbers[i-1]*numbers[i]; 
        elif ops=='/':  answer=numbers[i-1]/numbers[i]; 
        elif ops=='%':  answer=numbers[i-1]%numbers[i]; 
        numbers[i-1]=0;         
        numbers[i]=answer;  #update the answer in the list numbers  
        i+=1;               #increment index i
    return int(numbers[-1]) #return the last element of the list numbers with final answer