Python: weird SyntaxError: invalid syntax

The code was apparently normal:

def myFunctionTestOK():
   return "hi there ok"

def myFunctionTestFail():
   return "hi there fail"

and the error was:

Traceback (most recent call last):  

  File "C:\mytest.py", line 5

    return "hi there fail"

                          ^

SyntaxError: invalid syntax

I was using the Pydev Eclipse Plugin. After a lot of time trying to identify the error I decide to open the file using Notepad ++ http://notepad-plus-plus.org/

clicking in the 'show all characters' button:

I found out that there was missing a (LF) just after the line return "hi there fail":

so I put the cursor just after "hi there fail" and pressed enter:

And finally deleted the line with the single (CR):

Now everything works smoothly.