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Syntax Error on leading 0 in integer tokens #77485

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jackb mannequin opened this issue Apr 18, 2018 · 3 comments
Closed

Syntax Error on leading 0 in integer tokens #77485

jackb mannequin opened this issue Apr 18, 2018 · 3 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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@jackb
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jackb mannequin commented Apr 18, 2018

BPO 33304
Nosy @stevendaprano

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 2018-04-18.01:25:39.376>
created_at = <Date 2018-04-18.01:11:07.224>
labels = ['interpreter-core', 'type-bug', 'invalid']
title = 'Syntax Error on leading 0 in integer tokens'
updated_at = <Date 2018-04-18.01:48:19.620>
user = 'https://bugs.python.org/jackb'

bugs.python.org fields:

activity = <Date 2018-04-18.01:48:19.620>
actor = 'steven.daprano'
assignee = 'none'
closed = True
closed_date = <Date 2018-04-18.01:25:39.376>
closer = 'steven.daprano'
components = ['Interpreter Core']
creation = <Date 2018-04-18.01:11:07.224>
creator = 'jackb'
dependencies = []
files = []
hgrepos = []
issue_num = 33304
keywords = []
message_count = 3.0
messages = ['315429', '315430', '315432']
nosy_count = 2.0
nosy_names = ['steven.daprano', 'jackb']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33304'
versions = ['Python 3.4']
@jackb
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jackb mannequin commented Apr 18, 2018

Entering 007 gives a syntax error. Should return 7.
00 correctly returns 0.
007. correctly returns 7.0.

@jackb jackb mannequin added interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error labels Apr 18, 2018
@stevendaprano
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This is not a bug, it is intentional.

In Python 2, numbers with a leading zero are interpreted as octal, leading to surprising results:

py> 015
13

In Python 3, we use 0o15 to get octal, and 015 becomes a syntax error.

@stevendaprano
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I've opened an issue to improve the error message: bpo-33305

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error
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