[issue30497] Line number of docstring in AST

[Steven Myint]

Steven Myint added the comment:

I think what you guys have brought up makes sense.

Now that you mention it, I see that pyflakes gives the wrong line number if an 
escaped newline appears after the doctests. Though, it works fine if the 
escaped newline appears before it.

https://github.com/PyCQA/pyflakes/blob/1af4f14ad4675bf5c61c47bbb7c2421b50d1cba4/pyflakes/checker.py#L842

This is a non-default feature in pyflakes anyway, so we can live with it.

Thanks

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[issue30497] Line number of docstring in AST

[Steven Myint]

New submission from Steven Myint:

Since #29463, it is no longer obvious how to get the line number of a docstring 
in the AST:

import ast

x = ast.parse('''\
def foo():
"""This is a docstring."""
''')

# In Python 3.6, the docstring and line number would be:
print(x.body[0].body[0].value.s)
print(x.body[0].body[0].value.lineno)

# In Python 3.7, I don't know what the equivalent would be.
print(x.body[0].docstring)
# Line number?

We use this feature in pyflakes (https://github.com/PyCQA/pyflakes/issues/271).

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components: Interpreter Core
messages: 294654
nosy: myint
priority: normal
severity: normal
status: open
title: Line number of docstring in AST
versions: Python 3.7

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[issue8296] multiprocessing.Pool hangs when issuing KeyboardInterrupt

[Steven Myint]

Changes by Steven Myint c...@stevenmyint.com:


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[issue21540] PEP 8 should recommend is not and not in

[Steven Myint]

Changes by Steven Myint c...@stevenmyint.com:


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[issue20980] In multiprocessing.pool, ExceptionWithTraceback should derive from Exception

[Steven Myint]

Steven Myint added the comment:

This bug was introduced in #13831.

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versions: +Python 3.5

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[issue20980] In multiprocessing.pool, ExceptionWithTraceback should derive from Exception

[Steven Myint]

New submission from Steven Myint:

In multiprocessing.pool, ExceptionWithTraceback is not derived from Exception. 
Thus when it is raised, we get the exception, TypeError: exceptions must 
derive from BaseException. Attached is a patch that fixes this.

See below example traceback that prompted me to notice this:

Traceback (most recent call last):
  File /Users/myint/Library/Python/3.4/bin/yolk, line 9, in module
load_entry_point('yolk3k==0.7.3', 'console_scripts', 'yolk')()
  File /Users/myint/Library/Python/3.4/lib/python/site-packages/yolk/cli.py, 
line 1123, in main
my_yolk.run()
  File /Users/myint/Library/Python/3.4/lib/python/site-packages/yolk/cli.py, 
line 208, in run
return getattr(self, action)()
  File /Users/myint/Library/Python/3.4/lib/python/site-packages/yolk/cli.py, 
line 240, in show_updates
for (project_name, version, newest) in _updates(pkg_list, self.pypi):
  File /Users/myint/Library/Python/3.4/lib/python/site-packages/yolk/cli.py, 
line 1104, in _updates
names):
  File 
/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/pool.py,
 line 255, in map
return self._map_async(func, iterable, mapstar, chunksize).get()
  File 
/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/pool.py,
 line 594, in get
raise self._value
TypeError: exceptions must derive from BaseException

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components: Library (Lib)
files: exception_with_traceback.diff
keywords: patch
messages: 214101
nosy: myint
priority: normal
severity: normal
status: open
title: In multiprocessing.pool, ExceptionWithTraceback should derive from 
Exception
type: behavior
versions: Python 3.4
Added file: http://bugs.python.org/file34518/exception_with_traceback.diff

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[issue20980] In multiprocessing.pool, ExceptionWithTraceback should derive from Exception

[Steven Myint]

Steven Myint added the comment:

I didn't quite understand the multiprocessing test cases, but attached is a 
standalone test case that reproduces the problem. The problem only shows up 
when using ThreadPool.

$ python thread_pool_exception_test.py
Traceback (most recent call last):
  File thread_pool_exception_test.py, line 7, in module
pool.map(exception, [1])
  File 
/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/pool.py,
 line 255, in map
return self._map_async(func, iterable, mapstar, chunksize).get()
  File 
/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/pool.py,
 line 594, in get
raise self._value
TypeError: exceptions must derive from BaseException

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Added file: http://bugs.python.org/file34520/thread_pool_exception_test.py

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