[issue6849] Tutorial changes

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

In addition section 8.3 of the tutorial references the .message
attribute which is now deprecated.

But use of .args is discouraged. Instead, the preferred use is to pass a
single argument to an exception (which can be a tuple if multiple
arguments are needed) and have it bound to the message attribute. One
may also instantiate an exception first before raising it and add any
attributes to it as desired.

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