Question

Im supposed to create a function

arg1 arg2

def compare_back(('c', 'u', 'p', 'b', 'o', 'a', 'r', 'd'),('b', 'u', 'c', 'k', 'b', 'o', 'a', 'r', 'd')):

we can compare either 2 strings, 2 tuples or 2 lists

and the function is supposed to return the number of characters that are in both parameters but we stop the counter when we get to a specific character and do the comparison and the other tuple isnt the same

so like for this example we would return 5 because we start from index -1 and go in descending order and so we see d vs d, r vs r, a vs a until we get to k vs p which is viewing index -6 on both strings and everything else is indentical so we would return 5

another example

arg1 = 'Hello world!'
arg2 = 'Hello world!  This is an interesting string.'

with those two strings it should return 12 thats including the space as a character in between Hello and World

Answer 1

code:

def compare_back(param1,param2):

count = 0

j = len(param1)-1

for i in range(len(param2)-1,-1,-1):

#check whether the characters are same or not

if param2[i] == param1[j]:

#increment the count

count +=1

#decrement first param index as well

j -=1

else:

#if the characters are not same and count is not 0 we can stop comparing

if count!=0:

break

return count

print(compare_back(('c', 'u', 'p', 'b', 'o', 'a', 'r', 'd'),('b', 'u', 'c', 'k', 'b', 'o', 'a', 'r', 'd')))

print(compare_back( 'Hello world!', 'Hello world! This is an interesting string.'))