How to use the py.error.ENOENT function in py

info = usecache and cache.info.get(self)
        if not info:
            try:
                output = self._svn('info')
            except py.process.cmdexec.Error, e:
                if e.err.find('Path is not a working copy directory') != -1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find("is not under version control") != -1:
                    raise py.error.ENOENT(self, e.err)
                raise
            # XXX SVN 1.3 has output on stderr instead of stdout (while it does
            # return 0!), so a bit nasty, but we assume no output is output
            # to stderr...
            if (output.strip() == '' or 
                    output.lower().find('not a versioned resource') != -1):
                raise py.error.ENOENT(self, output)
            info = InfoSvnWCCommand(output)

            # Can't reliably compare on Windows without access to win32api
            if py.std.sys.platform != 'win32': 
                if info.path != self.localpath: 
                    raise py.error.ENOENT(self, "not a versioned resource:" + 
                            " %s != %s" % (info.path, self.localpath)) 
            cache.info[self] = info
        self.rev = info.rev
        return info

def info(self, usecache=1):
        """ return an Info structure with svn-provided information. """
        info = usecache and cache.info.get(self)
        if not info:
            try:
                output = self._svn('info')
            except py.process.cmdexec.Error:
                e = sys.exc_info()[1]
                if e.err.find('Path is not a working copy directory') != -1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find("is not under version control") != -1:
                    raise py.error.ENOENT(self, e.err)
                raise
            # XXX SVN 1.3 has output on stderr instead of stdout (while it does
            # return 0!), so a bit nasty, but we assume no output is output
            # to stderr...
            if (output.strip() == '' or
                    output.lower().find('not a versioned resource') != -1):
                raise py.error.ENOENT(self, output)
            info = InfoSvnWCCommand(output)

            # Can't reliably compare on Windows without access to win32api
            if py.std.sys.platform != 'win32':
                if info.path != self.localpath:
                    raise py.error.ENOENT(self, "not a versioned resource:" +
                            " %s != %s" % (info.path, self.localpath))

def info(self):
        """ return an Info structure with svn-provided information. """
        parent = self.dirpath()
        nameinfo_seq = parent._listdir_nameinfo()
        bn = self.basename
        for name, info in nameinfo_seq:
            if name == bn:
                return info
        raise py.error.ENOENT(self)

if not info:
            try:
                output = self._svn('info')
            except py.process.cmdexec.Error:
                e = sys.exc_info()[1]
                if e.err.find('Path is not a working copy directory') != -1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find("is not under version control") != -1:
                    raise py.error.ENOENT(self, e.err)
                raise
            # XXX SVN 1.3 has output on stderr instead of stdout (while it does
            # return 0!), so a bit nasty, but we assume no output is output
            # to stderr...
            if (output.strip() == '' or
                    output.lower().find('not a versioned resource') != -1):
                raise py.error.ENOENT(self, output)
            info = InfoSvnWCCommand(output)

            # Can't reliably compare on Windows without access to win32api
            if py.std.sys.platform != 'win32':
                if info.path != self.localpath:
                    raise py.error.ENOENT(self, "not a versioned resource:" +
                            " %s != %s" % (info.path, self.localpath))
            cache.info[self] = info
        return info

invert = True
                    try:
                        meth = getattr(self, name[3:])
                    except AttributeError:
                        pass
            if meth is None:
                raise TypeError(
                    "no %r checker available for %r" % (name, self.path))
            try:
                if py.code.getrawcode(meth).co_argcount > 1:
                    if (not meth(value)) ^ invert:
                        return False
                else:
                    if bool(value) ^ bool(meth()) ^ invert:
                        return False
            except (py.error.ENOENT, py.error.ENOTDIR):
                for name in self._depend_on_existence:
                    if name in kw:
                        if kw.get(name):
                            return False
                    name = 'not' + name
                    if name in kw:
                        if not kw.get(name):
                            return False
        return True

raise py.error.ENOENT(self, e.err)
                elif e.err.find("is not under version control") != -1:
                    raise py.error.ENOENT(self, e.err)
                raise
            # XXX SVN 1.3 has output on stderr instead of stdout (while it does
            # return 0!), so a bit nasty, but we assume no output is output
            # to stderr...
            if (output.strip() == '' or
                    output.lower().find('not a versioned resource') != -1):
                raise py.error.ENOENT(self, output)
            info = InfoSvnWCCommand(output)

            # Can't reliably compare on Windows without access to win32api
            if py.std.sys.platform != 'win32':
                if info.path != self.localpath:
                    raise py.error.ENOENT(self, "not a versioned resource:" +
                            " %s != %s" % (info.path, self.localpath))
            cache.info[self] = info
        return info

try:
            try:
                key = 'LC_MESSAGES'
                hold = os.environ.get(key)
                os.environ[key] = 'C'
                out = py.process.cmdexec(string)
            finally:
                if hold:
                    os.environ[key] = hold
                else:
                    del os.environ[key]
        except py.process.cmdexec.Error:
            e = sys.exc_info()[1]
            strerr = e.err.lower()
            if strerr.find('file not found') != -1:
                raise py.error.ENOENT(self)
            if (strerr.find('file exists') != -1 or
                strerr.find('file already exists') != -1 or
                strerr.find("can't create directory") != -1):
                raise py.error.EEXIST(self)
            raise
        return out

def _makesdist(self):
        setup = self.config.setupdir.join("setup.py")
        if not setup.check():
            raise tox.exception.MissingFile(setup)
        action = self.newaction(None, "packaging")
        with action:
            action.setactivity("sdist-make", setup)
            self.make_emptydir(self.config.distdir)
            action.popen([sys.executable, setup, "sdist", "--formats=zip",
                          "--dist-dir", self.config.distdir, ],
                         cwd=self.config.setupdir)
            try:
                return self.config.distdir.listdir()[0]
            except py.error.ENOENT:
                # check if empty or comment only
                data = []
                with open(str(setup)) as fp:
                    for line in fp:
                        if line and line[0] == '#':
                            continue
                        data.append(line)
                if not ''.join(data).strip():
                    self.report.error(
                        'setup.py is empty'
                    )
                    raise SystemExit(1)
                self.report.error(
                    'No dist directory found. Please check setup.py, e.g with:\n'
                    '     python setup.py sdist'
                )

def info(self, usecache=1):
        """ return an Info structure with svn-provided information. """
        info = usecache and cache.info.get(self)
        if not info:
            try:
                output = self._svn('info')
            except py.process.cmdexec.Error:
                e = sys.exc_info()[1]
                if e.err.find('Path is not a working copy directory') != -1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find("is not under version control") != -1:
                    raise py.error.ENOENT(self, e.err)
                raise
            # XXX SVN 1.3 has output on stderr instead of stdout (while it does
            # return 0!), so a bit nasty, but we assume no output is output
            # to stderr...
            if (output.strip() == '' or
                    output.lower().find('not a versioned resource') != -1):
                raise py.error.ENOENT(self, output)
            info = InfoSvnWCCommand(output)

            # Can't reliably compare on Windows without access to win32api
            if sys.platform != 'win32':
                if info.path != self.localpath:
                    raise py.error.ENOENT(self, "not a versioned resource:" +
                            " %s != %s" % (info.path, self.localpath))