json traceback on a float

[afonari]

BPO	37874
Nosy	@ericvsmith, @serhiy-storchaka, @afonari

^{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 2019-08-16.14:29:06.752>
created_at = <Date 2019-08-16.14:22:41.264>
labels = ['invalid', 'type-bug', 'library']
title = 'json traceback on a float'
updated_at = <Date 2019-08-16.15:42:21.086>
user = 'https://github.com/afonari'

bugs.python.org fields:

activity = <Date 2019-08-16.15:42:21.086>
actor = 'af'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-16.14:29:06.752>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2019-08-16.14:22:41.264>
creator = 'af'
dependencies = []
files = []
hgrepos = []
issue_num = 37874
keywords = []
message_count = 4.0
messages = ['349866', '349867', '349871', '349873']
nosy_count = 3.0
nosy_names = ['eric.smith', 'serhiy.storchaka', 'af']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37874'
versions = ['Python 3.6']

[afonari]

json.loads traceback with:

[In [16]: json.loads("[1.e-8]")
---------------------------------------------------------------------------

JSONDecodeError                           Traceback (most recent call last)
<ipython-input-16-bf0d3d6c51c5> in <module>()
----> 1 json.loads("[1.e-8]")

/scr/fonari/2019-4/internal/lib/python3.6/json/init.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
352 parse_int is None and parse_float is None and
353 parse_constant is None and object_pairs_hook is None and not kw):
--> 354 return _default_decoder.decode(s)
355 if cls is None:
356 cls = JSONDecoder

/scr/fonari/2019-4/internal/lib/python3.6/json/decoder.py in decode(self, s, _w)
337
338 """
--> 339 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
340 end = _w(s, end).end()
341 if end != len(s):

/scr/fonari/2019-4/internal/lib/python3.6/json/decoder.py in raw_decode(self, s, idx)
353 """
354 try:
--> 355 obj, end = self.scan_once(s, idx)
356 except StopIteration as err:
357 raise JSONDecodeError("Expecting value", s, err.value) from None

JSONDecodeError: Expecting ',' delimiter: line 1 column 3 (char 2)

Works with json.loads("[1.0e-8]") and json.loads("[1e-8]")

[serhiy-storchaka]

1.0e-8 is not a format for numbers in JSON. See RFC 7159 (https://tools.ietf.org/html/rfc7159.html#section-6):

      number = [ minus ] int [ frac ] [ exp ]

  decimal-point = %x2E       ; .

  digit1-9 = %x31-39         ; 1-9

  e = %x65 / %x45            ; e E

      exp = e [ minus / plus ] 1*DIGIT

      frac = decimal-point 1*DIGIT

      int = zero / ( digit1-9 *DIGIT )

  minus = %x2D               ; -

  plus = %x2B                ; +

  zero = %x30                ; 0

[ericvsmith]

I think Serhiy means 1.e-8 is not valid.

The spec says that at least one digit is required in the "frac" part, after the decimal.

[afonari]

I understand, thanks.