Check presence of a file

[buran]

I am using 2 features that are from recent versions of python, the string interpolation f"bla bla {variable} bla bla" that you can change it to "bla bla {} bla bla".format(variable) and the new exceptions FileNotFoundError and PermissionError... if your python is too old and returns other exception, just experiment from the terminal and use the proper ones...

f-strings are 3.6+ feature, so with 3.5 you are not OK to use them