Python string rule always returns false

Question

I have a problem with my Python code. For some reason, comparing two strings always returns False.

def checkChanged(checkURL, currentMessage):
  tempMessage = urllib.urlopen(checkURL)
  tempMessage = tempMessage.read()
  print (tempMessage + ". " + currentMessage + ".")
  if (str(tempMessage) == str(currentMessage)):
    print ("equal")
    return False
  else:
    print ("not equal")
    return True

( Assume the indentation is correct. I had to reformat when pasting here )

The problem that I think of is the instruction if, I tried many options where both lines were not enclosed in str(), I also tried isinstead ==, but that False, I printed both values ​​on the line before just checking, and they are equal. Did I miss something?