Python os.pathsep() Examples

def site_config_dirs(appname):
    """Return a list of potential user-shared config dirs for this application.

        "appname" is the name of application.

    Typical user config directories are:
        macOS:      /Library/Application Support/<AppName>/
        Unix:       /etc or $XDG_CONFIG_DIRS[i]/<AppName>/ for each value in
                    $XDG_CONFIG_DIRS
        Win XP:     C:\Documents and Settings\All Users\Application ...
                    ...Data\<AppName>\
        Vista:      (Fail! "C:\ProgramData" is a hidden *system* directory
                    on Vista.)
        Win 7:      Hidden, but writeable on Win 7:
                    C:\ProgramData\<AppName>\
    """
    if WINDOWS:
        path = os.path.normpath(_get_win_folder("CSIDL_COMMON_APPDATA"))
        pathlist = [os.path.join(path, appname)]
    elif sys.platform == 'darwin':
        pathlist = [os.path.join('/Library/Application Support', appname)]
    else:
        # try looking in $XDG_CONFIG_DIRS
        xdg_config_dirs = os.getenv('XDG_CONFIG_DIRS', '/etc/xdg')
        if xdg_config_dirs:
            pathlist = [
                os.path.join(expanduser(x), appname)
                for x in xdg_config_dirs.split(os.pathsep)
            ]
        else:
            pathlist = []

        # always look in /etc directly as well
        pathlist.append('/etc')

    return pathlist


# -- Windows support functions -- 

def _pythonpath():
    items = os.environ.get('PYTHONPATH', '').split(os.pathsep)
    return filter(None, items) 

def which(program):
    """Determines whether program exists
    """
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file
    raise 

def finalize_options(self):
        # This might be confusing: both build-clib and build-temp default
        # to build-temp as defined by the "build" command.  This is because
        # I think that C libraries are really just temporary build
        # by-products, at least from the point of view of building Python
        # extensions -- but I want to keep my options open.
        self.set_undefined_options('build',
                                   ('build_temp', 'build_clib'),
                                   ('build_temp', 'build_temp'),
                                   ('compiler', 'compiler'),
                                   ('debug', 'debug'),
                                   ('force', 'force'))

        self.libraries = self.distribution.libraries
        if self.libraries:
            self.check_library_list(self.libraries)

        if self.include_dirs is None:
            self.include_dirs = self.distribution.include_dirs or []
        if isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)

        # XXX same as for build_ext -- what about 'self.define' and
        # 'self.undef' ? 

def find_executable(executable, path=None):
    """Tries to find 'executable' in the directories listed in 'path'.

    A string listing directories separated by 'os.pathsep'; defaults to
    os.environ['PATH'].  Returns the complete filename or None if not found.
    """
    if path is None:
        path = os.environ['PATH']
    paths = path.split(os.pathsep)
    base, ext = os.path.splitext(executable)

    if (sys.platform == 'win32' or os.name == 'os2') and (ext != '.exe'):
        executable = executable + '.exe'

    if not os.path.isfile(executable):
        for p in paths:
            f = os.path.join(p, executable)
            if os.path.isfile(f):
                # the file exists, we have a shot at spawn working
                return f
        return None
    else:
        return executable 

def _iscommand(cmd):
    """Return True if cmd is executable or can be found on the executable
    search path."""
    if _isexecutable(cmd):
        return True
    path = os.environ.get("PATH")
    if not path:
        return False
    for d in path.split(os.pathsep):
        exe = os.path.join(d, cmd)
        if _isexecutable(exe):
            return True
    return False


# General parent classes 

def which(program):
    # type: (str) -> Optional[str]
    program = exename(program)
    fpath, _ = os.path.split(program)
    if fpath:
        if is_executable(program):
            return program
    else:
        for path in [os.path.abspath(os.curdir)] + os.environ['PATH'].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(unifilename(path), unifilename(program))
            if is_executable(exe_file):
                return exe_file

    return None

# ---------------------------------------------------------------------- 

def find_command(cmd, paths=None, pathext=None):
    """Searches the PATH for the given command and returns its path"""
    if paths is None:
        paths = os.environ.get('PATH', '').split(os.pathsep)
    if isinstance(paths, string_types):
        paths = [paths]
    # check if there are funny path extensions for executables, e.g. Windows
    if pathext is None:
        pathext = get_pathext()
    pathext = [ext for ext in pathext.lower().split(os.pathsep) if len(ext)]
    # don't use extensions if the command ends with one of them
    if os.path.splitext(cmd)[1].lower() in pathext:
        pathext = ['']
    # check if we find the command on PATH
    for path in paths:
        # try without extension first
        cmd_path = os.path.join(path, cmd)
        for ext in pathext:
            # then including the extension
            cmd_path_ext = cmd_path + ext
            if os.path.isfile(cmd_path_ext):
                return cmd_path_ext
        if os.path.isfile(cmd_path):
            return cmd_path
    raise BadCommand('Cannot find command %r' % cmd) 

def find_library_nt(name):
    # modified from ctypes.util
    # ctypes.util.find_library just returns first result he found
    # but we want to try them all
    # because on Windows, users may have both 32bit and 64bit version installed
    results = []
    for directory in os.environ['PATH'].split(os.pathsep):
        fname = os.path.join(directory, name)
        if os.path.isfile(fname):
            results.append(fname)
        if fname.lower().endswith(".dll"):
            continue
        fname = fname + ".dll"
        if os.path.isfile(fname):
            results.append(fname)
    return results 

def run(self):
		env = self.env
		bld = self.generator.bld
		wd = bld.bldnode.abspath()

		#add src node + bld node (for generated java code)
		srcpath = self.generator.path.abspath() + os.sep + self.generator.srcdir
		srcpath += os.pathsep
		srcpath += self.generator.path.get_bld().abspath() + os.sep + self.generator.srcdir

		classpath = env.CLASSPATH
		classpath += os.pathsep
		classpath += os.pathsep.join(self.classpath)
		classpath = "".join(classpath)

		self.last_cmd = lst = []
		lst.extend(Utils.to_list(env['JAVADOC']))
		lst.extend(['-d', self.generator.javadoc_output.abspath()])
		lst.extend(['-sourcepath', srcpath])
		lst.extend(['-classpath', classpath])
		lst.extend(['-subpackages'])
		lst.extend(self.generator.javadoc_package)
		lst = [x for x in lst if x]

		self.generator.bld.cmd_and_log(lst, cwd=wd, env=env.env or None, quiet=0) 

def configure(self):
	"""
	Detect the javac, java and jar programs
	"""
	# If JAVA_PATH is set, we prepend it to the path list
	java_path = self.environ['PATH'].split(os.pathsep)
	v = self.env

	if 'JAVA_HOME' in self.environ:
		java_path = [os.path.join(self.environ['JAVA_HOME'], 'bin')] + java_path
		self.env['JAVA_HOME'] = [self.environ['JAVA_HOME']]

	for x in 'javac java jar javadoc'.split():
		self.find_program(x, var=x.upper(), path_list=java_path)

	if 'CLASSPATH' in self.environ:
		v['CLASSPATH'] = self.environ['CLASSPATH']

	if not v['JAR']: self.fatal('jar is required for making java packages')
	if not v['JAVAC']: self.fatal('javac is required for compiling java classes')

	v['JARCREATE'] = 'cf' # can use cvf
	v['JAVACFLAGS'] = [] 

def configure(self):
	"""
	Detect the scalac program
	"""
	# If SCALA_HOME is set, we prepend it to the path list
	java_path = self.environ['PATH'].split(os.pathsep)
	v = self.env

	if 'SCALA_HOME' in self.environ:
		java_path = [os.path.join(self.environ['SCALA_HOME'], 'bin')] + java_path
		self.env['SCALA_HOME'] = [self.environ['SCALA_HOME']]

	for x in 'scalac scala'.split():
		self.find_program(x, var=x.upper(), path_list=java_path)

	if 'CLASSPATH' in self.environ:
		v['CLASSPATH'] = self.environ['CLASSPATH']

	v.SCALACFLAGS = ['-verbose']
	if not v['SCALAC']: self.fatal('scalac is required for compiling scala classes') 

def run(task):
		command = 'SAS'
		fun = sas_fun

		node = task.inputs[0]
		logfilenode = node.change_ext('.log')
		lstfilenode = node.change_ext('.lst')

		# set the cwd
		task.cwd = task.inputs[0].parent.get_src().abspath()
		Logs.debug('runner: %s on %s' % (command, node.abspath))

		SASINPUTS = node.parent.get_bld().abspath() + os.pathsep + node.parent.get_src().abspath() + os.pathsep
		task.env.env = {'SASINPUTS': SASINPUTS}

		task.env.SRCFILE = node.abspath()
		task.env.LOGFILE = logfilenode.abspath()
		task.env.LSTFILE = lstfilenode.abspath()
		ret = fun(task)
		if ret:
			Logs.error('Running %s on %r returned a non-zero exit' % (command, node))
			Logs.error('SRCFILE = %r' % node)
			Logs.error('LOGFILE = %r' % logfilenode)
			Logs.error('LSTFILE = %r' % lstfilenode)
		return ret 

def configure(self):
	"""
	Detect the javac, java and jar programs
	"""
	# If JAVA_PATH is set, we prepend it to the path list
	java_path = self.environ['PATH'].split(os.pathsep)
	v = self.env

	if 'JAVA_HOME' in self.environ:
		java_path = [os.path.join(self.environ['JAVA_HOME'], 'bin')] + java_path
		self.env['JAVA_HOME'] = [self.environ['JAVA_HOME']]

	for x in 'javac java jar javadoc'.split():
		self.find_program(x, var=x.upper(), path_list=java_path)

	if 'CLASSPATH' in self.environ:
		v['CLASSPATH'] = self.environ['CLASSPATH']

	if not v['JAR']: self.fatal('jar is required for making java packages')
	if not v['JAVAC']: self.fatal('javac is required for compiling java classes')

	v['JARCREATE'] = 'cf' # can use cvf
	v['JAVACFLAGS'] = [] 

def configure(self):
	"""
	Detect the scalac program
	"""
	# If SCALA_HOME is set, we prepend it to the path list
	java_path = self.environ['PATH'].split(os.pathsep)
	v = self.env

	if 'SCALA_HOME' in self.environ:
		java_path = [os.path.join(self.environ['SCALA_HOME'], 'bin')] + java_path
		self.env['SCALA_HOME'] = [self.environ['SCALA_HOME']]

	for x in 'scalac scala'.split():
		self.find_program(x, var=x.upper(), path_list=java_path)

	if 'CLASSPATH' in self.environ:
		v['CLASSPATH'] = self.environ['CLASSPATH']

	v.SCALACFLAGS = ['-verbose']
	if not v['SCALAC']: self.fatal('scalac is required for compiling scala classes') 

def run(task):
		command = 'SAS'
		fun = sas_fun

		node = task.inputs[0]
		logfilenode = node.change_ext('.log')
		lstfilenode = node.change_ext('.lst')

		# set the cwd
		task.cwd = task.inputs[0].parent.get_src().abspath()
		Logs.debug('runner: %s on %s' % (command, node.abspath))

		SASINPUTS = node.parent.get_bld().abspath() + os.pathsep + node.parent.get_src().abspath() + os.pathsep
		task.env.env = {'SASINPUTS': SASINPUTS}

		task.env.SRCFILE = node.abspath()
		task.env.LOGFILE = logfilenode.abspath()
		task.env.LSTFILE = lstfilenode.abspath()
		ret = fun(task)
		if ret:
			Logs.error('Running %s on %r returned a non-zero exit' % (command, node))
			Logs.error('SRCFILE = %r' % node)
			Logs.error('LOGFILE = %r' % logfilenode)
			Logs.error('LSTFILE = %r' % lstfilenode)
		return ret 

def check_exe(name, env=None):
	"""
	Ensure that a program exists

	:type name: string
	:param name: name or path to program
	:return: path of the program or None
	"""
	if not name:
		raise ValueError('Cannot execute an empty string!')
	def is_exe(fpath):
		return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

	fpath, fname = os.path.split(name)
	if fpath and is_exe(name):
		return os.path.abspath(name)
	else:
		env = env or os.environ
		for path in env["PATH"].split(os.pathsep):
			path = path.strip('"')
			exe_file = os.path.join(path, name)
			if is_exe(exe_file):
				return os.path.abspath(exe_file)
	return None 

def run(self):
		env = self.env
		bld = self.generator.bld
		wd = bld.bldnode.abspath()

		#add src node + bld node (for generated java code)
		srcpath = self.generator.path.abspath() + os.sep + self.generator.srcdir
		srcpath += os.pathsep
		srcpath += self.generator.path.get_bld().abspath() + os.sep + self.generator.srcdir

		classpath = env.CLASSPATH
		classpath += os.pathsep
		classpath += os.pathsep.join(self.classpath)
		classpath = "".join(classpath)

		self.last_cmd = lst = []
		lst.extend(Utils.to_list(env['JAVADOC']))
		lst.extend(['-d', self.generator.javadoc_output.abspath()])
		lst.extend(['-sourcepath', srcpath])
		lst.extend(['-classpath', classpath])
		lst.extend(['-subpackages'])
		lst.extend(self.generator.javadoc_package)
		lst = [x for x in lst if x]

		self.generator.bld.cmd_and_log(lst, cwd=wd, env=env.env or None, quiet=0) 

def configure(self):
	"""
	Detect the javac, java and jar programs
	"""
	# If JAVA_PATH is set, we prepend it to the path list
	java_path = self.environ['PATH'].split(os.pathsep)
	v = self.env

	if 'JAVA_HOME' in self.environ:
		java_path = [os.path.join(self.environ['JAVA_HOME'], 'bin')] + java_path
		self.env['JAVA_HOME'] = [self.environ['JAVA_HOME']]

	for x in 'javac java jar javadoc'.split():
		self.find_program(x, var=x.upper(), path_list=java_path)

	if 'CLASSPATH' in self.environ:
		v['CLASSPATH'] = self.environ['CLASSPATH']

	if not v['JAR']: self.fatal('jar is required for making java packages')
	if not v['JAVAC']: self.fatal('javac is required for compiling java classes')

	v['JARCREATE'] = 'cf' # can use cvf
	v['JAVACFLAGS'] = [] 

def check_exe(name, env=None):
	"""
	Ensure that a program exists
	:type name: string
	:param name: name or path to program
	:return: path of the program or None
	"""
	if not name:
		raise ValueError('Cannot execute an empty string!')
	def is_exe(fpath):
		return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

	fpath, fname = os.path.split(name)
	if fpath and is_exe(name):
		return os.path.abspath(name)
	else:
		env = env or os.environ
		for path in env["PATH"].split(os.pathsep):
			path = path.strip('"')
			exe_file = os.path.join(path, name)
			if is_exe(exe_file):
				return os.path.abspath(exe_file)
	return None 

def which(program):
    import os
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None
    
#source: https://stackoverflow.com/questions/3431825/generating-an-md5-checksum-of-a-file 

def find_executable(executable):
    """
    Return the path to the given executable, or None if not found.

    create_environment is used to augment PATH before searching
    for the executable.

    """

    env = create_environment()

    for base in env.get('PATH', '').split(os.pathsep):
        path = os.path.join(os.path.expanduser(base), executable)

        # On Windows, if path does not have an extension, try .exe, .cmd, .bat
        if sublime.platform() == 'windows' and not os.path.splitext(path)[1]:
            for extension in ('.exe', '.cmd', '.bat'):
                path_ext = path + extension

                if can_exec(path_ext):
                    return path_ext
        elif can_exec(path):
            return path

    return None 

def find_command(cmd, path=None, pathext=None):
    if path is None:
        path = os.environ.get('PATH', '').split(os.pathsep)
    if isinstance(path, six.string_types):
        path = [path]
    # check if there are funny path extensions for executables, e.g. Windows
    if pathext is None:
        pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD').split(os.pathsep)
    # don't use extensions if the command ends with one of them
    for ext in pathext:
        if cmd.endswith(ext):
            pathext = ['']
            break
    # check if we find the command on PATH
    for p in path:
        f = os.path.join(p, cmd)
        if os.path.isfile(f):
            return f
        for ext in pathext:
            fext = f + ext
            if os.path.isfile(fext):
                return fext
    return None 

def which1(program, pathstr=None):
    if pathstr is None:
        pathstr = os.environ["PATH"]

    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in pathstr.split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None 

def loadProjectFile(path):
	global project_data, project_path
	try:
		with open(path) as json_file: project_data = json.load(json_file)
		project_path=os.path.dirname(path) + os.sep
		com_path = project_path + "project" + os.sep + "core" + os.sep + "com"
		sys.path.append(com_path)
		
	except Exception as e: 
		print("LOAD ERROR")
		print(str(e))
		
	env_path = os.getenv("PYTHONPATH")
	if env_path:
		if not com_path in env_path:
			os.environ["PYTHONPATH"] += os.pathsep + com_path
	else:
		os.environ["PYTHONPATH"] = com_path 

def find_command(cmd, path=None, pathext=None):
    if path is None:
        path = os.environ.get('PATH', '').split(os.pathsep)
    if isinstance(path, six.string_types):
        path = [path]
    # check if there are funny path extensions for executables, e.g. Windows
    if pathext is None:
        pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD').split(os.pathsep)
    # don't use extensions if the command ends with one of them
    for ext in pathext:
        if cmd.endswith(ext):
            pathext = ['']
            break
    # check if we find the command on PATH
    for p in path:
        f = os.path.join(p, cmd)
        if os.path.isfile(f):
            return f
        for ext in pathext:
            fext = f + ext
            if os.path.isfile(fext):
                return fext
    return None 

def is_executable_available(program):
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath = os.path.dirname(program)
    if fpath:
        if is_exe(program):
            return True
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return True

    return False 

def is_executable_available(program):
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath = os.path.dirname(program)
    if fpath:
        if is_exe(program):
            return True
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return True

    return False 

def is_executable_available(program):
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath = os.path.dirname(program)
    if fpath:
        if is_exe(program):
            return True
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return True

    return False 

def find_command(cmd, paths=None, pathext=None):
    """Searches the PATH for the given command and returns its path"""
    if paths is None:
        paths = os.environ.get('PATH', '').split(os.pathsep)
    if isinstance(paths, string_types):
        paths = [paths]
    # check if there are funny path extensions for executables, e.g. Windows
    if pathext is None:
        pathext = get_pathext()
    pathext = [ext for ext in pathext.lower().split(os.pathsep) if len(ext)]
    # don't use extensions if the command ends with one of them
    if os.path.splitext(cmd)[1].lower() in pathext:
        pathext = ['']
    # check if we find the command on PATH
    for path in paths:
        # try without extension first
        cmd_path = os.path.join(path, cmd)
        for ext in pathext:
            # then including the extension
            cmd_path_ext = cmd_path + ext
            if os.path.isfile(cmd_path_ext):
                return cmd_path_ext
        if os.path.isfile(cmd_path):
            return cmd_path
    raise BadCommand('Cannot find command %r' % cmd) 

def finalize_options(self):
        # This might be confusing: both build-clib and build-temp default
        # to build-temp as defined by the "build" command.  This is because
        # I think that C libraries are really just temporary build
        # by-products, at least from the point of view of building Python
        # extensions -- but I want to keep my options open.
        self.set_undefined_options('build',
                                   ('build_temp', 'build_clib'),
                                   ('build_temp', 'build_temp'),
                                   ('compiler', 'compiler'),
                                   ('debug', 'debug'),
                                   ('force', 'force'))

        self.libraries = self.distribution.libraries
        if self.libraries:
            self.check_library_list(self.libraries)

        if self.include_dirs is None:
            self.include_dirs = self.distribution.include_dirs or []
        if isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)

        # XXX same as for build_ext -- what about 'self.define' and
        # 'self.undef' ? 

def _popen(command, args):
    import os
    path = os.environ.get("PATH", os.defpath).split(os.pathsep)
    path.extend(('/sbin', '/usr/sbin'))
    for dir in path:
        executable = os.path.join(dir, command)
        if (os.path.exists(executable) and
            os.access(executable, os.F_OK | os.X_OK) and
            not os.path.isdir(executable)):
            break
    else:
        return None
    # LC_ALL to ensure English output, 2>/dev/null to prevent output on
    # stderr (Note: we don't have an example where the words we search for
    # are actually localized, but in theory some system could do so.)
    cmd = 'LC_ALL=C %s %s 2>/dev/null' % (executable, args)
    return os.popen(cmd) 

def which(cmd):
    path = os.environ.get("PATH", os.defpath)
    if not path:
        return None
    path = [get_tools_path()] + path.split(os.pathsep) + ["."]
    if sys.platform == "win32":
        pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
        files = [cmd + ext for ext in pathext]
    else:
        files = [cmd]

    seen = set()
    for dir in path:
	normdir = os.path.normcase(dir)
	if normdir not in seen:
	    seen.add(normdir)
	    for thefile in files:
		name = os.path.join(dir, thefile)
		if os.path.exists(name):
		    return name
    return None 

def which(program):
        import os
        def is_exe(fpath):
            return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

        fpath, fname = os.path.split(program)
        if fpath:
            if is_exe(program):
                return program
        else:
            for path in os.environ["PATH"].split(os.pathsep):
                path = path.strip('"')
                exe_file = os.path.join(path, program)
                if is_exe(exe_file):
                    return exe_file

        return None 

def _build_paths(self, name, spec_path_lists, exists):
        """
        Given an environment variable name and specified paths,
        return a pathsep-separated string of paths containing
        unique, extant, directories from those paths and from
        the environment variable. Raise an error if no paths
        are resolved.
        """
        # flatten spec_path_lists
        spec_paths = itertools.chain.from_iterable(spec_path_lists)
        env_paths = safe_env.get(name, '').split(os.pathsep)
        paths = itertools.chain(spec_paths, env_paths)
        extant_paths = list(filter(os.path.isdir, paths)) if exists else paths
        if not extant_paths:
            msg = "%s environment variable is empty" % name.upper()
            raise distutils.errors.DistutilsPlatformError(msg)
        unique_paths = self._unique_everseen(extant_paths)
        return os.pathsep.join(unique_paths)

    # from Python docs 

def find_library_nt(name):
    # modified from ctypes.util
    # ctypes.util.find_library just returns first result he found
    # but we want to try them all
    # because on Windows, users may have both 32bit and 64bit version installed
    results = []
    for directory in os.environ['PATH'].split(os.pathsep):
        fname = os.path.join(directory, name)
        if os.path.isfile(fname):
            results.append(fname)
        if fname.lower().endswith(".dll"):
            continue
        fname = fname + ".dll"
        if os.path.isfile(fname):
            results.append(fname)
    return results 

def find_library_nt(name):
    # modified from ctypes.util
    # ctypes.util.find_library just returns first result he found
    # but we want to try them all
    # because on Windows, users may have both 32bit and 64bit version installed
    results = []
    for directory in os.environ['PATH'].split(os.pathsep):
        fname = os.path.join(directory, name)
        if os.path.isfile(fname):
            results.append(fname)
        if fname.lower().endswith(".dll"):
            continue
        fname = fname + ".dll"
        if os.path.isfile(fname):
            results.append(fname)
    return results 

def _build_paths(self, name, spec_path_lists, exists):
        """
        Given an environment variable name and specified paths,
        return a pathsep-separated string of paths containing
        unique, extant, directories from those paths and from
        the environment variable. Raise an error if no paths
        are resolved.
        """
        # flatten spec_path_lists
        spec_paths = itertools.chain.from_iterable(spec_path_lists)
        env_paths = safe_env.get(name, '').split(os.pathsep)
        paths = itertools.chain(spec_paths, env_paths)
        extant_paths = list(filter(os.path.isdir, paths)) if exists else paths
        if not extant_paths:
            msg = "%s environment variable is empty" % name.upper()
            raise distutils.errors.DistutilsPlatformError(msg)
        unique_paths = self._unique_everseen(extant_paths)
        return os.pathsep.join(unique_paths)

    # from Python docs 

def find_command(cmd, path=None, pathext=None):
    if path is None:
        path = os.environ.get('PATH', '').split(os.pathsep)
    if isinstance(path, six.string_types):
        path = [path]
    # check if there are funny path extensions for executables, e.g. Windows
    if pathext is None:
        pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD').split(os.pathsep)
    # don't use extensions if the command ends with one of them
    for ext in pathext:
        if cmd.endswith(ext):
            pathext = ['']
            break
    # check if we find the command on PATH
    for p in path:
        f = os.path.join(p, cmd)
        if os.path.isfile(f):
            return f
        for ext in pathext:
            fext = f + ext
            if os.path.isfile(fext):
                return fext
    return None 

def finalize_options(self):
        if self.parallel:
            try:
                self.parallel = int(self.parallel)
            except ValueError:
                raise ValueError("--parallel/-j argument must be an integer")

        # Ensure that self.include_dirs and self.distribution.include_dirs
        # refer to the same list object. finalize_options will modify
        # self.include_dirs, but self.distribution.include_dirs is used
        # during the actual build.
        # self.include_dirs is None unless paths are specified with
        # --include-dirs.
        # The include paths will be passed to the compiler in the order:
        # numpy paths, --include-dirs paths, Python include path.
        if isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)
        incl_dirs = self.include_dirs or []
        if self.distribution.include_dirs is None:
            self.distribution.include_dirs = []
        self.include_dirs = self.distribution.include_dirs
        self.include_dirs.extend(incl_dirs)

        old_build_ext.finalize_options(self)
        self.set_undefined_options('build', ('parallel', 'parallel')) 

def __init__(self,
                  default_lib_dirs=default_lib_dirs,
                  default_include_dirs=default_include_dirs,
                  verbosity=1,
                  ):
        self.__class__.info = {}
        self.local_prefixes = []
        defaults = {'library_dirs': os.pathsep.join(default_lib_dirs),
                    'include_dirs': os.pathsep.join(default_include_dirs),
                    'runtime_library_dirs': os.pathsep.join(default_runtime_dirs),
                    'rpath': '',
                    'src_dirs': os.pathsep.join(default_src_dirs),
                    'search_static_first': str(self.search_static_first),
                    'extra_compile_args': '', 'extra_link_args': ''}
        self.cp = ConfigParser(defaults)
        self.files = []
        self.files.extend(get_standard_file('.numpy-site.cfg'))
        self.files.extend(get_standard_file('site.cfg'))
        self.parse_config_files()
        if self.section is not None:
            self.search_static_first = self.cp.getboolean(
                self.section, 'search_static_first')
        assert isinstance(self.search_static_first, int) 

def path(klass):
        return os.environ['PATH'].split(os.pathsep) 

def _pythonpath():
    items = os.environ.get('PYTHONPATH', '').split(os.pathsep)
    return filter(None, items) 

def finalize_options (self):
            if self.library_dirs is None:
                self.library_dirs = []
            elif isinstance(self.library_dirs, basestring):
                self.library_dirs = self.library_dirs.split(os.pathsep)
            
            self.library_dirs.insert(0, os.path.join(sys.real_prefix, "Libs"))
            old_build_ext.finalize_options(self) 

def find_program(paths, name):
    """
        Find a file within the paths array and returns its path.
    """
    for path in paths.split(os.pathsep):
        prg = os.path.join(path, name)
        if os.path.isfile(prg):
            return prg
    return None 

def site_config_dirs(appname):
    """Return a list of potential user-shared config dirs for this application.

        "appname" is the name of application.

    Typical user config directories are:
        macOS:      /Library/Application Support/<AppName>/
        Unix:       /etc or $XDG_CONFIG_DIRS[i]/<AppName>/ for each value in
                    $XDG_CONFIG_DIRS
        Win XP:     C:\Documents and Settings\All Users\Application ...
                    ...Data\<AppName>\
        Vista:      (Fail! "C:\ProgramData" is a hidden *system* directory
                    on Vista.)
        Win 7:      Hidden, but writeable on Win 7:
                    C:\ProgramData\<AppName>\
    """
    if WINDOWS:
        path = os.path.normpath(_get_win_folder("CSIDL_COMMON_APPDATA"))
        pathlist = [os.path.join(path, appname)]
    elif sys.platform == 'darwin':
        pathlist = [os.path.join('/Library/Application Support', appname)]
    else:
        # try looking in $XDG_CONFIG_DIRS
        xdg_config_dirs = os.getenv('XDG_CONFIG_DIRS', '/etc/xdg')
        if xdg_config_dirs:
            pathlist = [
                os.path.join(expanduser(x), appname)
                for x in xdg_config_dirs.split(os.pathsep)
            ]
        else:
            pathlist = []

        # always look in /etc directly as well
        pathlist.append('/etc')

    return pathlist


# -- Windows support functions -- 

def finalize_options (self):
            if self.library_dirs is None:
                self.library_dirs = []
            elif isinstance(self.library_dirs, basestring):
                self.library_dirs = self.library_dirs.split(os.pathsep)
            
            self.library_dirs.insert(0, os.path.join(sys.real_prefix, "Libs"))
            old_build_ext.finalize_options(self) 

def which(command):
    """
    Searches the path for the executable specified in 'command'.
    """
    for path in os.environ['PATH'].split(os.pathsep):
        execpath = os.path.join(path, command)
        if os.path.isfile(execpath) and os.access(execpath, os.X_OK):
            return execpath
    return None 

def _execvpe(file, args, env=None):
    if env is not None:
        func = execve
        argrest = (args, env)
    else:
        func = execv
        argrest = (args,)
        env = environ

    head, tail = path.split(file)
    if head:
        func(file, *argrest)
        return
    if 'PATH' in env:
        envpath = env['PATH']
    else:
        envpath = defpath
    PATH = envpath.split(pathsep)
    saved_exc = None
    saved_tb = None
    for dir in PATH:
        fullname = path.join(dir, file)
        try:
            func(fullname, *argrest)
        except error, e:
            tb = sys.exc_info()[2]
            if (e.errno != errno.ENOENT and e.errno != errno.ENOTDIR
                and saved_exc is None):
                saved_exc = e
                saved_tb = tb
    if saved_exc:
        raise error, saved_exc, saved_tb
    raise error, e, tb

# Change environ to automatically call putenv() if it exists 

def finalize_options(self):
        if self.include_dirs is None:
            self.include_dirs = self.distribution.include_dirs or []
        elif isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)

        if self.libraries is None:
            self.libraries = []
        elif isinstance(self.libraries, str):
            self.libraries = [self.libraries]

        if self.library_dirs is None:
            self.library_dirs = []
        elif isinstance(self.library_dirs, str):
            self.library_dirs = self.library_dirs.split(os.pathsep)