subtraction is giving me a syntax error

[MRAB]

Joel Pendery wrote:
> So I am trying to write a bit of code and a simple numerical
> subtraction
> 
> y_diff = y_diff-H
> 
> is giving me the error
> 
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
> 
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
> 
> Thanks in advance

Character '\x96' is an en-dash, which looks like a hyphen/minus sign
'-', but isn't.