/usr/lib/python3/dist-packages/Cython/Build/IpythonMagic.py is in cython3 0.25.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
=====================
Cython related magics
=====================
Magic command interface for interactive work with Cython
.. note::
The ``Cython`` package needs to be installed separately. It
can be obtained using ``easy_install`` or ``pip``.
Usage
=====
To enable the magics below, execute ``%load_ext cythonmagic``.
``%%cython``
{CYTHON_DOC}
``%%cython_inline``
{CYTHON_INLINE_DOC}
``%%cython_pyximport``
{CYTHON_PYXIMPORT_DOC}
Author:
* Brian Granger
Code moved from IPython and adapted by:
* Martín Gaitán
Parts of this code were taken from Cython.inline.
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2010-2011, IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file ipython-COPYING.rst, distributed with this software.
#-----------------------------------------------------------------------------
from __future__ import absolute_import, print_function
import imp
import io
import os
import re
import sys
import time
try:
reload
except NameError: # Python 3
from imp import reload
try:
import hashlib
except ImportError:
import md5 as hashlib
from distutils.core import Distribution, Extension
from distutils.command.build_ext import build_ext
from IPython.core import display
from IPython.core import magic_arguments
from IPython.core.magic import Magics, magics_class, cell_magic
from IPython.utils import py3compat
try:
from IPython.paths import get_ipython_cache_dir
except ImportError:
# older IPython version
from IPython.utils.path import get_ipython_cache_dir
from IPython.utils.text import dedent
from ..Shadow import __version__ as cython_version
from ..Compiler.Errors import CompileError
from .Inline import cython_inline
from .Dependencies import cythonize
@magics_class
class CythonMagics(Magics):
def __init__(self, shell):
super(CythonMagics,self).__init__(shell)
self._reloads = {}
self._code_cache = {}
self._pyximport_installed = False
def _import_all(self, module):
for k,v in module.__dict__.items():
if not k.startswith('__'):
self.shell.push({k:v})
@cell_magic
def cython_inline(self, line, cell):
"""Compile and run a Cython code cell using Cython.inline.
This magic simply passes the body of the cell to Cython.inline
and returns the result. If the variables `a` and `b` are defined
in the user's namespace, here is a simple example that returns
their sum::
%%cython_inline
return a+b
For most purposes, we recommend the usage of the `%%cython` magic.
"""
locs = self.shell.user_global_ns
globs = self.shell.user_ns
return cython_inline(cell, locals=locs, globals=globs)
@cell_magic
def cython_pyximport(self, line, cell):
"""Compile and import a Cython code cell using pyximport.
The contents of the cell are written to a `.pyx` file in the current
working directory, which is then imported using `pyximport`. This
magic requires a module name to be passed::
%%cython_pyximport modulename
def f(x):
return 2.0*x
The compiled module is then imported and all of its symbols are
injected into the user's namespace. For most purposes, we recommend
the usage of the `%%cython` magic.
"""
module_name = line.strip()
if not module_name:
raise ValueError('module name must be given')
fname = module_name + '.pyx'
with io.open(fname, 'w', encoding='utf-8') as f:
f.write(cell)
if 'pyximport' not in sys.modules or not self._pyximport_installed:
import pyximport
pyximport.install(reload_support=True)
self._pyximport_installed = True
if module_name in self._reloads:
module = self._reloads[module_name]
reload(module)
else:
__import__(module_name)
module = sys.modules[module_name]
self._reloads[module_name] = module
self._import_all(module)
@magic_arguments.magic_arguments()
@magic_arguments.argument(
'-3', dest='language_level', action='store_const', const=3, default=None,
help="Select Python 3 syntax."
)
@magic_arguments.argument(
'-2', dest='language_level', action='store_const', const=2, default=None,
help="Select Python 2 syntax."
)
@magic_arguments.argument(
'-c', '--compile-args', action='append', default=[],
help="Extra flags to pass to compiler via the `extra_compile_args` "
"Extension flag (can be specified multiple times)."
)
@magic_arguments.argument(
'--link-args', action='append', default=[],
help="Extra flags to pass to linker via the `extra_link_args` "
"Extension flag (can be specified multiple times)."
)
@magic_arguments.argument(
'-l', '--lib', action='append', default=[],
help="Add a library to link the extension against (can be specified "
"multiple times)."
)
@magic_arguments.argument(
'-n', '--name',
help="Specify a name for the Cython module."
)
@magic_arguments.argument(
'-L', dest='library_dirs', metavar='dir', action='append', default=[],
help="Add a path to the list of library directories (can be specified "
"multiple times)."
)
@magic_arguments.argument(
'-I', '--include', action='append', default=[],
help="Add a path to the list of include directories (can be specified "
"multiple times)."
)
@magic_arguments.argument(
'-+', '--cplus', action='store_true', default=False,
help="Output a C++ rather than C file."
)
@magic_arguments.argument(
'-f', '--force', action='store_true', default=False,
help="Force the compilation of a new module, even if the source has been "
"previously compiled."
)
@magic_arguments.argument(
'-a', '--annotate', action='store_true', default=False,
help="Produce a colorized HTML version of the source."
)
@cell_magic
def cython(self, line, cell):
"""Compile and import everything from a Cython code cell.
The contents of the cell are written to a `.pyx` file in the
directory `IPYTHONDIR/cython` using a filename with the hash of the
code. This file is then cythonized and compiled. The resulting module
is imported and all of its symbols are injected into the user's
namespace. The usage is similar to that of `%%cython_pyximport` but
you don't have to pass a module name::
%%cython
def f(x):
return 2.0*x
To compile OpenMP codes, pass the required `--compile-args`
and `--link-args`. For example with gcc::
%%cython --compile-args=-fopenmp --link-args=-fopenmp
...
"""
args = magic_arguments.parse_argstring(self.cython, line)
code = cell if cell.endswith('\n') else cell+'\n'
lib_dir = os.path.join(get_ipython_cache_dir(), 'cython')
quiet = True
key = code, line, sys.version_info, sys.executable, cython_version
if not os.path.exists(lib_dir):
os.makedirs(lib_dir)
if args.force:
# Force a new module name by adding the current time to the
# key which is hashed to determine the module name.
key += time.time(),
if args.name:
module_name = py3compat.unicode_to_str(args.name)
else:
module_name = "_cython_magic_" + hashlib.md5(str(key).encode('utf-8')).hexdigest()
module_path = os.path.join(lib_dir, module_name + self.so_ext)
have_module = os.path.isfile(module_path)
need_cythonize = not have_module
if args.annotate:
html_file = os.path.join(lib_dir, module_name + '.html')
if not os.path.isfile(html_file):
need_cythonize = True
if need_cythonize:
c_include_dirs = args.include
if 'numpy' in code:
import numpy
c_include_dirs.append(numpy.get_include())
pyx_file = os.path.join(lib_dir, module_name + '.pyx')
pyx_file = py3compat.cast_bytes_py2(pyx_file, encoding=sys.getfilesystemencoding())
with io.open(pyx_file, 'w', encoding='utf-8') as f:
f.write(code)
extension = Extension(
name = module_name,
sources = [pyx_file],
include_dirs = c_include_dirs,
library_dirs = args.library_dirs,
extra_compile_args = args.compile_args,
extra_link_args = args.link_args,
libraries = args.lib,
language = 'c++' if args.cplus else 'c',
)
build_extension = self._get_build_extension()
try:
opts = dict(
quiet=quiet,
annotate=args.annotate,
force=True,
)
if args.language_level is not None:
assert args.language_level in (2, 3)
opts['language_level'] = args.language_level
elif sys.version_info[0] > 2:
opts['language_level'] = 3
build_extension.extensions = cythonize([extension], **opts)
except CompileError:
return
if not have_module:
build_extension.build_temp = os.path.dirname(pyx_file)
build_extension.build_lib = lib_dir
build_extension.run()
self._code_cache[key] = module_name
module = imp.load_dynamic(module_name, module_path)
self._import_all(module)
if args.annotate:
try:
with io.open(html_file, encoding='utf-8') as f:
annotated_html = f.read()
except IOError as e:
# File could not be opened. Most likely the user has a version
# of Cython before 0.15.1 (when `cythonize` learned the
# `force` keyword argument) and has already compiled this
# exact source without annotation.
print('Cython completed successfully but the annotated '
'source could not be read.', file=sys.stderr)
print(e, file=sys.stderr)
else:
return display.HTML(self.clean_annotated_html(annotated_html))
@property
def so_ext(self):
"""The extension suffix for compiled modules."""
try:
return self._so_ext
except AttributeError:
self._so_ext = self._get_build_extension().get_ext_filename('')
return self._so_ext
def _clear_distutils_mkpath_cache(self):
"""clear distutils mkpath cache
prevents distutils from skipping re-creation of dirs that have been removed
"""
try:
from distutils.dir_util import _path_created
except ImportError:
pass
else:
_path_created.clear()
def _get_build_extension(self):
self._clear_distutils_mkpath_cache()
dist = Distribution()
config_files = dist.find_config_files()
try:
config_files.remove('setup.cfg')
except ValueError:
pass
dist.parse_config_files(config_files)
build_extension = build_ext(dist)
build_extension.finalize_options()
return build_extension
@staticmethod
def clean_annotated_html(html):
"""Clean up the annotated HTML source.
Strips the link to the generated C or C++ file, which we do not
present to the user.
"""
r = re.compile('<p>Raw output: <a href="(.*)">(.*)</a>')
html = '\n'.join(l for l in html.splitlines() if not r.match(l))
return html
__doc__ = __doc__.format(
# rST doesn't see the -+ flag as part of an option list, so we
# hide it from the module-level docstring.
CYTHON_DOC = dedent(CythonMagics.cython.__doc__\
.replace('-+, --cplus','--cplus ')),
CYTHON_INLINE_DOC = dedent(CythonMagics.cython_inline.__doc__),
CYTHON_PYXIMPORT_DOC = dedent(CythonMagics.cython_pyximport.__doc__),
)
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