2_star_q8.py

def do_it(x,y,z):
    # To Do : for x in z: replace x by y,again and again
    # 1st step: if x appears in z 
    # 2nd step: then replce x by y
    
    for i in range(len(z)-3):
        
        if z[i:i+3]==x:        # I cannot understand why this is not working , I set 
            z=z[:i]+y+z[i+3:]  # the condition that if x is in z then modify z as follows
            i=0                # and then I set i as 0 , and go over the loop again, 
                               # find another instance where x is in z and do all of it again, but apparently this 
                               # isn't working ,it should return just 'ab' , but it returns 'aaaaabaaaaa' What am I    .                              # doing wrong here?
    return z
            
            
            
         
        
print do_it('aba','b','aaaaaabaaaaaa')
# >>> ab