Float infinity unpicklable with BINFLOAT-using protocols

[exarkun]

BPO	880990
Nosy	@tim-one

^{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 = 'https://github.com/tim-one'
closed_at = <Date 2004-01-21.01:28:31.000>
created_at = <Date 2004-01-21.00:20:07.000>
labels = ['library']
title = 'Float infinity unpicklable with BINFLOAT-using protocols'
updated_at = <Date 2004-01-21.01:28:31.000>
user = 'https://bugs.python.org/exarkun'

bugs.python.org fields:

activity = <Date 2004-01-21.01:28:31.000>
actor = 'tim.peters'
assignee = 'tim.peters'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2004-01-21.00:20:07.000>
creator = 'exarkun'
dependencies = []
files = []
hgrepos = []
issue_num = 880990
keywords = []
message_count = 2.0
messages = ['19730', '19731']
nosy_count = 2.0
nosy_names = ['tim.peters', 'exarkun']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue880990'
versions = ['Python 2.3']

[exarkun]

>>> import pickle
>>> pickle.dumps(1e100000, 2)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/pickle.py", line 1386, in dumps
    Pickler(file, protocol, bin).dump(obj)
  File "/usr/lib/python2.3/pickle.py", line 231, in dump
    self.save(obj)
  File "/usr/lib/python2.3/pickle.py", line 293, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.3/pickle.py", line 489, in
save_float
    self.write(BINFLOAT + pack('>d', obj))
SystemError: frexp() result out of range

Prior to BINFLOAT, float infinity could successfully be
pickled. The right thing to do here seems to be to
catch the exception and fall back to a FLOAT (string
representation) token.

[tim-one]

Logged In: YES
user_id=31435

Closed as Duplicate. See
<http://www.python.org/sf/445484\>. The feature request is
part of PEP-42. Python currently has no support for infinities,
NaNs, or signed zeroes in pickles; if you think you saw one of
those work now, it's a platform accident (in particular,
whether the string form of an infinity works depends entirely
on your platform C library, and such pickles are not portable).