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Bare except is very rarely the right thing
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Python 3.6 added a private API for tracing arbitrary memory allocations
so the tracemalloc module [0] can be used with numpy.
closes gh-4663
[0] https://docs.python.org/3/library/tracemalloc.html
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When a cython object contains numpy arrays the pure python allocation
hook can trigger during cythons __dealloc__ method and trigger a second
deletion of the object currently being deleted.
To minimize the probabily that that happens disable the garbage
collector during the hook.
As this involves python calls it is still possible that a double delete
occurs but chances are lowered, a proper solution would be C only hook
like python 3.4 tracemalloc module.
Closes gh-4834
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Add `print_function` to all `from __future__ import ...` statements
and use the python3 print function syntax everywhere.
Closes #3078.
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The new import `absolute_import` is added the `from __future__ import`
statement and The 2to3 `import` fixer is run to make the imports
compatible. There are several things that need to be dealt with to make
this work.
1) Files meant to be run as scripts run in a different environment than
files imported as part of a package, and so changes to those files need
to be skipped. The affected script files are:
* all setup.py files
* numpy/core/code_generators/generate_umath.py
* numpy/core/code_generators/generate_numpy_api.py
* numpy/core/code_generators/generate_ufunc_api.py
2) Some imported modules are not available as they are created during
the build process and consequently 2to3 is unable to handle them
correctly. Files that import those modules need a bit of extra work.
The affected files are:
* core/__init__.py,
* core/numeric.py,
* core/_internal.py,
* core/arrayprint.py,
* core/fromnumeric.py,
* numpy/__init__.py,
* lib/npyio.py,
* lib/function_base.py,
* fft/fftpack.py,
* random/__init__.py
Closes #3172
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This should be harmless, as we already are division clean. However,
placement of this import takes some care. In the future a script
can be used to append new features without worry, at least until
such time as it exceeds a single line. Having that ability will
make it easier to deal with absolute imports and printing updates.
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Wraps the SetHook and calls to the hook with the GIL, to prevent races.
Adds an example of using the interface for callbacks into python code.
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