Exceptions are often associated with file handling. Why? How do you sort an error derived from a disk full condition from trying to write to a read-only file system? Why is it not advisable to use...

Exceptions are often associated with file handling. Why? How do you sort an error derived from a disk full condition from trying to write to a read-only file system? Why is it not advisable to use except: to catch all kind of exceptions, instead of using, for example, except IOError:?