Python Triple Nested for Loop not Fully Iterating -


essentially happens when run code "print block[j]" section of program gets run, test code have afterwards i.e. print block[k] , print "testing code" not reached. i've been staring @ program last half hour , can't figure out why program can reach beyond 2nd nested loop not third. 

def swapii(str):    new_str = ""   letter in str:     if letter.isupper():       new_str = new_str + letter.lower()     else:       new_str = new_str + letter.upper()    new_list = new_str.split(' ')     in new_list:     block = i.split()      j in range(len(block)):         print block[j]         k in range(j+1, len(block)):             print block[k]             if block[j].isdigit() , block[k].isdigit():                 lala = block[j]                 block[j] = block[k]                 block[k] = lala                 print "testing code"        = ''.join(block)     return ' '.join(new_list)    # keep function call here   # see how enter arguments in python scroll down print swapii(raw_input())


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