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dictionary unpacking treated as syntax error

See original GitHub issue

The parser from lib2to3 doesn’t appear to support the ** operator.

Windows 7 64 bit, Python 3.5.1 64 bit.

Minimal example:

v1={1:2,3:4}
v2={**v1,5:6}
print(v2)

It works as expected:

bash-4.3$ python example.py
{1: 2, 3: 4, 5: 6}

but it crashes yapf:

bash-4.3$ yapf example.py
Traceback (most recent call last):
  File "c:\python35\lib\site-packages\yapf\yapflib\pytree_utils.py", line 100, in ParseCodeToTree
    tree = parser_driver.parse_string(code, debug=False)
  File "c:\python35\lib\lib2to3\pgen2\driver.py", line 106, in parse_string
    return self.parse_tokens(tokens, debug)
  File "c:\python35\lib\lib2to3\pgen2\driver.py", line 71, in parse_tokens
    if p.addtoken(type, value, (prefix, start)):
  File "c:\python35\lib\lib2to3\pgen2\parse.py", line 159, in addtoken
    raise ParseError("bad input", type, value, context)
lib2to3.pgen2.parse.ParseError: bad input: type=36, value='**', context=('', (2, 4))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\python35\lib\runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Python35\Scripts\yapf.exe\__main__.py", line 9, in <module>
  File "c:\python35\lib\site-packages\yapf\__init__.py", line 250, in run_main
    sys.exit(main(sys.argv))
  File "c:\python35\lib\site-packages\yapf\__init__.py", line 168, in main
    verify=args.verify)
  File "c:\python35\lib\site-packages\yapf\__init__.py", line 212, in FormatFiles
    logger=logging.warning)
  File "c:\python35\lib\site-packages\yapf\yapflib\yapf_api.py", line 90, in FormatFile
    verify=verify)
  File "c:\python35\lib\site-packages\yapf\yapflib\yapf_api.py", line 123, in FormatCode
    tree = pytree_utils.ParseCodeToTree(unformatted_source)
  File "c:\python35\lib\site-packages\yapf\yapflib\pytree_utils.py", line 106, in ParseCodeToTree
    tree = parser_driver.parse_string(code, debug=False)
  File "c:\python35\lib\lib2to3\pgen2\driver.py", line 106, in parse_string
    return self.parse_tokens(tokens, debug)
  File "c:\python35\lib\lib2to3\pgen2\driver.py", line 71, in parse_tokens
    if p.addtoken(type, value, (prefix, start)):
  File "c:\python35\lib\lib2to3\pgen2\parse.py", line 159, in addtoken
    raise ParseError("bad input", type, value, context)
lib2to3.pgen2.parse.ParseError: bad input: type=36, value='**', context=('', (2, 4))
bash-4.3$

Issue Analytics

State:
Created 8 years ago
Reactions:2
Comments:7 (3 by maintainers)

Top GitHub Comments

2reactions

lorenzogatticommented, Mar 14, 2016

Indeed, there are Python issues about this problem.

0reactions

deterralbacommented, Jan 12, 2018

For my fellow Googlers: I had the same error: lib2to3.pgen2.parse.ParseError: bad input: type=36, value='**', with python 3.5.2 on ubuntu.

I installed 3.6.4 on a virtualenv and it fixed the issue.

PS: hey the dev team, yapf is awesome and you should feel awesome 👍

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