[issue25474] Weird behavior when setting f_trace in a context manager

2015-10-25 Thread Fred Gansevles

New submission from Fred Gansevles:

I'm playing with the idea of making a DSL based on anonynous code blocks

I discovered that the behaviour of the context manager is different in some 
cases if there are line-continuations in the 'with' command

I've attached a script that reproduces this behaviour.

With both Python 2.7.6 and Python 3.4.3 I get the same results.


Fred.

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files: as_context.py
messages: 253426
nosy: Fred Gansevles
priority: normal
severity: normal
status: open
title: Weird behavior when setting f_trace in a context manager
type: behavior
Added file: http://bugs.python.org/file40858/as_context.py

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[issue25474] Weird behavior when setting f_trace in a context manager

2015-11-02 Thread Fred Gansevles

Fred Gansevles added the comment:

Xavier, thanks for looking at my post.
But, since all six invocations of the context manager are the same
- I did an 'ast.parse' and 'ast.dump' and the the six calls were *exactly* the 
same (save lineno and col_offset) - why does 'zero', 'one', 'four' and 'five' 
get assigned but 'two' and 'three' not ?

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[issue25474] Weird behavior when setting f_trace in a context manager

2015-11-02 Thread Fred Gansevles

Fred Gansevles added the comment:

Xavier, thanks! you found it.
If I look the code again, I see that with zero, one, four and five
the context-manager (i.e. Context()) and the target (one .. five) are on
the same code-line
In the case of two and three they are on a different line.

Now, with the dependency of the trace function on the *physical line* it all 
make sense.

Fred.

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status: open -> closed

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