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%i string format breaks for large floats (incomplete int conversion) #46218

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goodger opened this issue Jan 24, 2008 · 2 comments
Closed

%i string format breaks for large floats (incomplete int conversion) #46218

goodger opened this issue Jan 24, 2008 · 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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@goodger
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goodger commented Jan 24, 2008

BPO 1924
Nosy @goodger, @facundobatista

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 2008-01-24.16:23:17.307>
created_at = <Date 2008-01-24.16:14:49.396>
labels = ['interpreter-core', 'type-bug']
title = '%i string format breaks for large floats (incomplete int conversion)'
updated_at = <Date 2008-01-24.16:23:17.299>
user = 'https://github.com/goodger'

bugs.python.org fields:

activity = <Date 2008-01-24.16:23:17.299>
actor = 'facundobatista'
assignee = 'none'
closed = True
closed_date = <Date 2008-01-24.16:23:17.307>
closer = 'facundobatista'
components = ['Interpreter Core']
creation = <Date 2008-01-24.16:14:49.396>
creator = 'goodger'
dependencies = []
files = []
hgrepos = []
issue_num = 1924
keywords = []
message_count = 2.0
messages = ['61635', '61637']
nosy_count = 2.0
nosy_names = ['goodger', 'facundobatista']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue1924'
versions = ['Python 2.6', 'Python 2.5', 'Python 2.4', 'Python 2.3']
@goodger
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goodger commented Jan 24, 2008

I ran across this bug in some legacy production code when numbers got high:

>>> '%i' % 2e9
'2000000000'
>>> '%i' % 3e9
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: int argument required

It looks like the float is being automatically converted to an int, but
floats > sys.maxint cause an error. However,

>>> int(3e9)
3000000000L

So the implicit float-to-int conversion is imperfect; large floats are
not being converted to long ints.

Same error in Python 2.3 through 2.6a0 (as of 2007-12-28).

In Python 2.1.3 & 2.2.3 the error is "OverflowError: float too large to
convert". The same error is triggered by int(3e9) though.

While it's arguably not-quite-sane to have code that triggers this
error, the inconsistency is what concerns me.

@goodger goodger added interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error labels Jan 24, 2008
@facundobatista
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Duplicates bpo-1742669 (copied this text to there)

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