title: TabError in Python 3 function
body: <p>Im writing a new program for my friend,
   and in a function I have a try and an except but if i run it, it gives me<br>
   an error :"File "main.py", line 19
      try:
         ^
  TabError: inconsistent use of tabs and spaces in indentation"
   Im trying everything to fix it but it doesn't work...</p>