[docs] [issue35446] incorrect example

[Alistsair Lenhard]

New submission from Alistsair Lenhard <alistair.lenhard at googlemail.com>:

under: https://docs.python.org/3/tutorial/errors.html

Original it says:
"Note that if the except clauses were reversed (with except B first), it would have printed B, B, B — the first matching except clause is triggered."

It should read:
"Note that if the except clauses were reversed (with except B first), it would have printed D, D, D — the first matching except clause is triggered."
 
As D is the first expression in the print statement.
So if the expression is changed to "except B:"

class B(Exception):
    pass

class C(B):
    pass

class D(C):
    pass

for cls in [B, C, D]:
    try:
        raise cls()
    except B:
        print("D")
    except C:
        print("C")
    except B:
        print("B")

Result is:
D
D
D

----------
assignee: docs at python
components: Documentation
messages: 331428
nosy: Alistair, docs at python
priority: normal
severity: normal
status: open
title: incorrect example
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35446>
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