Running a Python file

[Jim Byrnes]

I have been teaching myself Python.  Running some of my programs and 
others examples I noticed that some I could run by double-clicking them 
and others I could not.  Looking at the file permissions I saw that they 
were different.  Then I noticed that all the ones I could not run were 
ones I gone into Properties-->Permissions and check execute as a 
program.  Once I unchecked it they worked.

This seems backwards to me.  Could someone tell me why this works this way?

Thanks,  Jim