golden hour

/usr/lib/python3/dist-packages/setuptools/command

File/Folder	Size	Actions
__init__.py	568 B
__pycache__	-
alias.py	2.37 KB
bdist_egg.py	17.76 KB
bdist_rpm.py	1.47 KB
bdist_wininst.py	637 B
build_clib.py	4.31 KB
build_ext.py	12.74 KB
build_py.py	9.37 KB
develop.py	8 KB
dist_info.py	960 B
easy_install.py	87.75 KB
egg_info.py	24.96 KB
install.py	4.59 KB
install_egg_info.py	3.12 KB
install_lib.py	4.92 KB
install_scripts.py	2.46 KB
launcher manifest.xml	628 B
py36compat.py	4.88 KB
register.py	468 B
rotate.py	2.11 KB
saveopts.py	658 B
sdist.py	7.9 KB
setopt.py	4.97 KB
test.py	9.4 KB
upload.py	462 B
upload_docs.py	7.14 KB

Edit: build_py.py

from glob import glob
from distutils.util import convert_path
import distutils.command.build_py as orig
import os
import fnmatch
import textwrap
import io
import distutils.errors
import itertools

from setuptools.extern import six
from setuptools.extern.six.moves import map, filter, filterfalse

try:
    from setuptools.lib2to3_ex import Mixin2to3
except ImportError:

class Mixin2to3:
        def run_2to3(self, files, doctests=True):
            "do nothing"

class build_py(orig.build_py, Mixin2to3):
    """Enhanced 'build_py' command that includes data files with packages

The data files are specified via a 'package_data' argument to 'setup()'.
    See 'setuptools.dist.Distribution' for more details.

Also, this version of the 'build_py' command allows you to specify both
    'py_modules' and 'packages' in the same setup operation.
    """

def finalize_options(self):
        orig.build_py.finalize_options(self)
        self.package_data = self.distribution.package_data
        self.exclude_package_data = (self.distribution.exclude_package_data or
                                     {})
        if 'data_files' in self.__dict__:
            del self.__dict__['data_files']
        self.__updated_files = []
        self.__doctests_2to3 = []

def run(self):
        """Build modules, packages, and copy data files to build directory"""
        if not self.py_modules and not self.packages:
            return

if self.py_modules:
            self.build_modules()

if self.packages:
            self.build_packages()
            self.build_package_data()

self.run_2to3(self.__updated_files, False)
        self.run_2to3(self.__updated_files, True)
        self.run_2to3(self.__doctests_2to3, True)

# Only compile actual .py files, using our base class' idea of what our
        # output files are.
        self.byte_compile(orig.build_py.get_outputs(self, include_bytecode=0))

def __getattr__(self, attr):
        "lazily compute data files"
        if attr == 'data_files':
            self.data_files = self._get_data_files()
            return self.data_files
        return orig.build_py.__getattr__(self, attr)

def build_module(self, module, module_file, package):
        if six.PY2 and isinstance(package, six.string_types):
            # avoid errors on Python 2 when unicode is passed (#190)
            package = package.split('.')
        outfile, copied = orig.build_py.build_module(self, module, module_file,
                                                     package)
        if copied:
            self.__updated_files.append(outfile)
        return outfile, copied

def _get_data_files(self):
        """Generate list of '(package,src_dir,build_dir,filenames)' tuples"""
        self.analyze_manifest()
        return list(map(self._get_pkg_data_files, self.packages or ()))

def _get_pkg_data_files(self, package):
        # Locate package source directory
        src_dir = self.get_package_dir(package)

# Compute package build directory
        build_dir = os.path.join(*([self.build_lib] + package.split('.')))

# Strip directory from globbed filenames
        filenames = [
            os.path.relpath(file, src_dir)
            for file in self.find_data_files(package, src_dir)
        ]
        return package, src_dir, build_dir, filenames

def find_data_files(self, package, src_dir):
        """Return filenames for package's data files in 'src_dir'"""
        patterns = self._get_platform_patterns(
            self.package_data,
            package,
            src_dir,
        )
        globs_expanded = map(glob, patterns)
        # flatten the expanded globs into an iterable of matches
        globs_matches = itertools.chain.from_iterable(globs_expanded)
        glob_files = filter(os.path.isfile, globs_matches)
        files = itertools.chain(
            self.manifest_files.get(package, []),
            glob_files,
        )
        return self.exclude_data_files(package, src_dir, files)

def build_package_data(self):
        """Copy data files into build directory"""
        for package, src_dir, build_dir, filenames in self.data_files:
            for filename in filenames:
                target = os.path.join(build_dir, filename)
                self.mkpath(os.path.dirname(target))
                srcfile = os.path.join(src_dir, filename)
                outf, copied = self.copy_file(srcfile, target)
                srcfile = os.path.abspath(srcfile)
                if (copied and
                        srcfile in self.distribution.convert_2to3_doctests):
                    self.__doctests_2to3.append(outf)

def analyze_manifest(self):
        self.manifest_files = mf = {}
        if not self.distribution.include_package_data:
            return
        src_dirs = {}
        for package in self.packages or ():
            # Locate package source directory
            src_dirs[assert_relative(self.get_package_dir(package))] = package

self.run_command('egg_info')
        ei_cmd = self.get_finalized_command('egg_info')
        for path in ei_cmd.filelist.files:
            d, f = os.path.split(assert_relative(path))
            prev = None
            oldf = f
            while d and d != prev and d not in src_dirs:
                prev = d
                d, df = os.path.split(d)
                f = os.path.join(df, f)
            if d in src_dirs:
                if path.endswith('.py') and f == oldf:
                    continue  # it's a module, not data
                mf.setdefault(src_dirs[d], []).append(path)

def get_data_files(self):
        pass  # Lazily compute data files in _get_data_files() function.

def check_package(self, package, package_dir):
        """Check namespace packages' __init__ for declare_namespace"""
        try:
            return self.packages_checked[package]
        except KeyError:
            pass

init_py = orig.build_py.check_package(self, package, package_dir)
        self.packages_checked[package] = init_py

if not init_py or not self.distribution.namespace_packages:
            return init_py

for pkg in self.distribution.namespace_packages:
            if pkg == package or pkg.startswith(package + '.'):
                break
        else:
            return init_py

with io.open(init_py, 'rb') as f:
            contents = f.read()
        if b'declare_namespace' not in contents:
            raise distutils.errors.DistutilsError(
                "Namespace package problem: %s is a namespace package, but "
                "its\n__init__.py does not call declare_namespace()! Please "
                'fix it.\n(See the setuptools manual under '
                '"Namespace Packages" for details.)\n"' % (package,)
            )
        return init_py

def initialize_options(self):
        self.packages_checked = {}
        orig.build_py.initialize_options(self)

def get_package_dir(self, package):
        res = orig.build_py.get_package_dir(self, package)
        if self.distribution.src_root is not None:
            return os.path.join(self.distribution.src_root, res)
        return res

def exclude_data_files(self, package, src_dir, files):
        """Filter filenames for package's data files in 'src_dir'"""
        files = list(files)
        patterns = self._get_platform_patterns(
            self.exclude_package_data,
            package,
            src_dir,
        )
        match_groups = (
            fnmatch.filter(files, pattern)
            for pattern in patterns
        )
        # flatten the groups of matches into an iterable of matches
        matches = itertools.chain.from_iterable(match_groups)
        bad = set(matches)
        keepers = (
            fn
            for fn in files
            if fn not in bad
        )
        # ditch dupes
        return list(_unique_everseen(keepers))

@staticmethod
    def _get_platform_patterns(spec, package, src_dir):
        """
        yield platform-specific path patterns (suitable for glob
        or fn_match) from a glob-based spec (such as
        self.package_data or self.exclude_package_data)
        matching package in src_dir.
        """
        raw_patterns = itertools.chain(
            spec.get('', []),
            spec.get(package, []),
        )
        return (
            # Each pattern has to be converted to a platform-specific path
            os.path.join(src_dir, convert_path(pattern))
            for pattern in raw_patterns
        )

# from Python docs
def _unique_everseen(iterable, key=None):
    "List unique elements, preserving order. Remember all elements ever seen."
    # unique_everseen('AAAABBBCCDAABBB') --> A B C D
    # unique_everseen('ABBCcAD', str.lower) --> A B C D
    seen = set()
    seen_add = seen.add
    if key is None:
        for element in filterfalse(seen.__contains__, iterable):
            seen_add(element)
            yield element
    else:
        for element in iterable:
            k = key(element)
            if k not in seen:
                seen_add(k)
                yield element

def assert_relative(path):
    if not os.path.isabs(path):
        return path
    from distutils.errors import DistutilsSetupError

msg = textwrap.dedent("""
        Error: setup script specifies an absolute path:

setup() arguments must *always* be /-separated paths relative to the
        setup.py directory, *never* absolute paths.
        """).lstrip() % path
    raise DistutilsSetupError(msg)