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__repr__ is ignored when formatting exceptions #50132

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ellisj mannequin opened this issue Apr 29, 2009 · 2 comments
Closed

__repr__ is ignored when formatting exceptions #50132

ellisj mannequin opened this issue Apr 29, 2009 · 2 comments
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interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error

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@ellisj
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Mannequin

ellisj mannequin commented Apr 29, 2009

BPO 5882
Nosy @benjaminp

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = <Date 2009-04-29.23:47:04.338>
created_at = <Date 2009-04-29.21:36:16.350>
labels = ['interpreter-core', 'type-bug', 'invalid']
title = '__repr__ is ignored when formatting exceptions'
updated_at = <Date 2009-04-29.23:47:04.336>
user = 'https://bugs.python.org/ellisj'

bugs.python.org fields:

activity = <Date 2009-04-29.23:47:04.336>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2009-04-29.23:47:04.338>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2009-04-29.21:36:16.350>
creator = 'ellisj'
dependencies = []
files = []
hgrepos = []
issue_num = 5882
keywords = []
message_count = 2.0
messages = ['86826', '86835']
nosy_count = 2.0
nosy_names = ['ellisj', 'benjamin.peterson']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5882'
versions = ['Python 2.6', 'Python 3.0']
@ellisj
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Mannequin Author

ellisj mannequin commented Apr 29, 2009

The docs say that "If a class defines __repr__() but not __str__(), then
__repr__() is also used when an “informal” string representation of
instances of that class is required."

but, repr is ignored:
>>> class E(Exception):
...     def __repr__(self):
...         return 'fancy!'
...
>>> raise E()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.E

only str is respected:
>>> class E(Exception):
...     def __str__(self):
...         return 'fancy!'
...
>>> raise E()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.E: fancy!

@ellisj ellisj mannequin added interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error labels Apr 29, 2009
@benjaminp
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And Exception implements __str__, so it is called.

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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