How to use the portage._unicode_encode function in portage

def validate_desktop_entry(path):
	args = ["desktop-file-validate", path]

	args = [_unicode_encode(x, errors='strict') for x in args]
	proc = subprocess.Popen(args,
		stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
	output_lines = _unicode_decode(proc.communicate()[0]).splitlines()
	proc.wait()

	if output_lines:
		filtered_output = []
		for line in output_lines:
			msg = line[len(path)+2:]
			# "hint:" output is new in desktop-file-utils-0.21
			if msg.startswith('hint: ') or msg in _ignored_errors:
				continue
			if 'for key "NotShowIn" in group "Desktop Entry"' in msg or \
				'for key "OnlyShowIn" in group "Desktop Entry"' in msg:
				exempt = False
				for s in _ShowIn_exemptions:

options.PF.lstrip(os.sep), desttree.lstrip(os.sep),
		options.doc_prefix.lstrip(os.sep), prefix).rstrip(os.sep)

	if not os.path.exists(fullpath):
		sys.stderr.write("!!! dohtml: %s does not exist\n" % fullpath)
		return False
	elif os.path.isfile(fullpath):
		ext = os.path.splitext(basename)[1][1:]
		if ext in options.allowed_exts or basename in options.allowed_files:
			dodir(destdir)
			dofile(fullpath, os.path.join(destdir, basename))
		elif warn_on_skipped_files and ext not in unwarned_skipped_extensions and basename not in unwarned_skipped_files:
			skipped_files.append(fullpath)
	elif options.recurse and os.path.isdir(fullpath) and \
	     basename not in options.disallowed_dirs:
		for i in _os.listdir(_unicode_encode(fullpath)):
			try:
				i = _unicode_decode(i, errors='strict')
			except UnicodeDecodeError:
				writemsg('dohtml: argument is not encoded as UTF-8: %s\n' %
					_unicode_decode(i), noiselevel=-1)
				sys.exit(1)
			pfx = basename
			if prefix:
				pfx = os.path.join(prefix, pfx)
			install(i, dirname, options, pfx)
	elif not options.recurse and os.path.isdir(fullpath):
		global skipped_directories
		skipped_directories.append(fullpath)
		return False
	else:
		return False

"egrep '^[^\?] .*' | "
			"egrep -v '^. .*/digest-[^/]+|^cvs server: .* -- ignored$'")
	if vcs == 'svn':
		logging.info(
			"Performing a %s with a little magic grep to check for updates." %
			green("svn status -u"))
		cmd = (
			"svn status -u 2>&1 | "
			"egrep -v '^.  +.*/digest-[^/]+' | "
			"head -n-1")

	if cmd is not None:
		# Use Popen instead of getstatusoutput(), in order to avoid
		# unicode handling problems (see bug #310789).
		args = [BASH_BINARY, "-c", cmd]
		args = [_unicode_encode(x) for x in args]
		proc = subprocess.Popen(
			args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
		out = _unicode_decode(proc.communicate()[0])
		proc.wait()
		mylines = out.splitlines()
		myupdates = []
		for line in mylines:
			if not line:
				continue

			# [ ] Unmodified (SVN)	[U] Updates		[P] Patches
			# [M] Modified			[A] Added		[R] Removed / Replaced
			# [D] Deleted
			if line[0] not in " UPMARD":
				# Stray Manifest is fine, we will readd it anyway.
				if line[0] == '?' and line[1:].lstrip() == 'Manifest':

updated_items = {}
	for k, mycontent in mydata.items():
		k_unicode = _unicode_decode(k,
			encoding=_encodings['repo.content'], errors='replace')
		if k_unicode not in ignored_dbentries:
			orig_content = mycontent
			mycontent = _unicode_decode(mycontent,
				encoding=_encodings['repo.content'], errors='replace')
			is_encoded = mycontent is not orig_content
			orig_content = mycontent
			for update_cmd in update_iter:
				mycontent = update_dbentry(update_cmd, mycontent,
					eapi=eapi, parent=parent)
			if mycontent != orig_content:
				if is_encoded:
					mycontent = _unicode_encode(mycontent,
						encoding=_encodings['repo.content'],
						errors='backslashreplace')
				updated_items[k] = mycontent
	return updated_items

def _read_repo_name(repo_path):
		"""
		Read repo_name from repo_path.
		Returns repo_name, missing.
		"""
		repo_name_path = os.path.join(repo_path, REPO_NAME_LOC)
		f = None
		try:
			f = io.open(
				_unicode_encode(repo_name_path,
				encoding=_encodings['fs'], errors='strict'),
				mode='r', encoding=_encodings['repo.content'],
				errors='replace')
			return f.readline().strip(), False
		except EnvironmentError:
			return "x-" + os.path.basename(repo_path), True
		finally:
			if f is not None:
				f.close()

def xpak_mem(mydata):
	"""Create an xpack segment from a map object."""

	mydata_encoded = {}
	for k, v in mydata.items():
		k = _unicode_encode(k,
			encoding=_encodings['repo.content'], errors='backslashreplace')
		v = _unicode_encode(v,
			encoding=_encodings['repo.content'], errors='backslashreplace')
		mydata_encoded[k] = v
	mydata = mydata_encoded
	del mydata_encoded

	indexglob = b''
	indexpos = 0
	dataglob = b''
	datapos = 0
	for x, newglob in mydata.items():
		mydatasize = len(newglob)
		indexglob = indexglob + encodeint(len(x)) + x + encodeint(datapos) + encodeint(mydatasize)
		indexpos = indexpos + 4 + len(x) + 4 + 4
		dataglob = dataglob + newglob

def __init__(self,value):
		self.value = value[:]
		if sys.hexversion < 0x3000000 and isinstance(self.value, unicode):
			# Workaround for string formatting operator and unicode value
			# attribute triggering empty output in formatted string.
			self.value = _unicode_encode(self.value)
	def __str__(self):

elif len(userpass) == 1:
		username = userpass[0]
		password = None
	del userpass

	http_headers = {}
	http_params = {}
	if username and password:
		try:
			encodebytes = base64.encodebytes
		except AttributeError:
			# Python 2
			encodebytes = base64.encodestring
		http_headers = {
			b"Authorization": "Basic %s" % \
			encodebytes(_unicode_encode("%s:%s" % (username, password))).replace(
			    b"\012",
			    b""
			  ),
		}

	if not conn:
		if protocol == "https":
			# Use local import since https typically isn't needed, and
			# this way we can usually avoid triggering the global scope
			# http.client ImportError handler (like during stage1 -> stage2
			# builds where USE=ssl is disabled for python).
			try:
				from http.client import HTTPSConnection as http_client_HTTPSConnection
			except ImportError:
				raise NotImplementedError(
					_("python must have ssl enabled for https support"))

node = LinkageMap._LibGraphNode(path, root)
				alt_path_node = lib_graph.get(node)
				if alt_path_node is not None:
					node = alt_path_node
				node.alt_paths.add(path)
				path_node_map[path] = node
			return node

		consumer_map = {}
		provider_nodes = set()
		# Create provider nodes and add them to the graph.
		for f_abs in old_contents:

			if os is _os_merge:
				try:
					_unicode_encode(f_abs,
						encoding=_encodings['merge'], errors='strict')
				except UnicodeEncodeError:
					# The package appears to have been merged with a 
					# different value of sys.getfilesystemencoding(),
					# so fall back to utf_8 if appropriate.
					try:
						_unicode_encode(f_abs,
							encoding=_encodings['fs'], errors='strict')
					except UnicodeEncodeError:
						pass
					else:
						os = portage.os

			f = f_abs[root_len:]
			if self.isowner(f):
				continue

merge_cmd = [self.bin_command, 'merge']
		merge_cmd.append('refs/remotes/%s' % remote_branch)
		if quiet:
			merge_cmd.append('--quiet')
		exitcode = portage.process.spawn(merge_cmd,
			cwd=portage._unicode_encode(self.repo.location),
			**self.spawn_kwargs)

		if exitcode != os.EX_OK:
			msg = "!!! git merge error in %s" % self.repo.location
			self.logger(self.xterm_titles, msg)
			writemsg_level(msg + "\n", level=logging.ERROR, noiselevel=-1)
			return (exitcode, False)

		current_rev = subprocess.check_output(rev_cmd,
			cwd=portage._unicode_encode(self.repo.location))

		return (os.EX_OK, current_rev != previous_rev)