[New-bugs-announce] [issue33899] Tokenize module does not mirror "end-of-input" is newline behavior

Ammar Askar report at bugs.python.org
Tue Jun 19 03:41:52 EDT 2018


New submission from Ammar Askar <ammar at ammaraskar.com>:

As was pointed out in https://bugs.python.org/issue33766 there is an edge case in the tokenizer whereby it will implicitly treat the end of input as a newline. The tokenize module in stdlib does not mirror the C code's behavior in this case.

tokenizer.c:

  ~/cpython $ echo -n 'x' | ./python
  ----------
  NAME ("x")
  NEWLINE
  ENDMARKER

tokenize module:

  ~/cpython $ echo -n 'x' | ./python -m tokenize
  1,0-1,1:            NAME           'x'            
  2,0-2,0:            ENDMARKER      ''

The instrumentation to have the C tokenizer dump out its tokens is mine, can provide a diff to produce that output if needed.

----------
assignee: ammar2
components: Library (Lib)
messages: 319934
nosy: ammar2
priority: normal
severity: normal
status: open
title: Tokenize module does not mirror "end-of-input" is newline behavior
type: behavior
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33899>
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