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

def rename(self, target):
        """ rename this path to target. """
        target = getattr(target, "strpath", target)
        return py.error.checked_call(os.rename, self.strpath, target)

def remove(self, rec=1, ignore_errors=False):
        """ remove a file or directory (or a directory tree if rec=1).
        if ignore_errors is True, errors while removing directories will
        be ignored.
        """
        if self.check(dir=1, link=0):
            if rec:
                # force remove of readonly files on windows
                if iswin32:
                    self.chmod(448, rec=1) # octcal 0700
                py.error.checked_call(py.std.shutil.rmtree, self.strpath,
                    ignore_errors=ignore_errors)
            else:
                py.error.checked_call(os.rmdir, self.strpath)
        else:
            if iswin32:
                self.chmod(448) # octcal 0700
            py.error.checked_call(os.remove, self.strpath)

def samefile(self, other):
        """ return True if 'other' references the same file as 'self'.
        """
        other = getattr(other, "strpath", other)
        if not isabs(other):
            other = abspath(other)
        if self == other:
            return True
        if iswin32:
            return False # there is no samefile
        return py.error.checked_call(
                os.path.samefile, self.strpath, other)

def open(self, mode='r', ensure=False, encoding=None):
        """ return an opened file with the given mode.

        If ensure is True, create parent directories if needed.
        """
        if ensure:
            self.dirpath().ensure(dir=1)
        if encoding:
            return py.error.checked_call(io.open, self.strpath, mode, encoding=encoding)
        return py.error.checked_call(open, self.strpath, mode)

def stat(self, raising=True):
        """ Return an os.stat() tuple. """
        if raising == True:
            return Stat(self, py.error.checked_call(os.stat, self.strpath))
        try:
            return Stat(self, os.stat(self.strpath))
        except KeyboardInterrupt:
            raise
        except Exception:
            return None

def open(self, mode='r', ensure=False, encoding=None):
        """ return an opened file with the given mode.

        If ensure is True, create parent directories if needed.
        """
        if ensure:
            self.dirpath().ensure(dir=1)
        if encoding:
            return py.error.checked_call(io.open, self.strpath, mode, encoding=encoding)
        return py.error.checked_call(open, self.strpath, mode)

def setmtime(self, mtime=None):
        """ set modification time for the given path.  if 'mtime' is None
        (the default) then the file's mtime is set to current time.

        Note that the resolution for 'mtime' is platform dependent.
        """
        if mtime is None:
            return py.error.checked_call(os.utime, self.strpath, mtime)
        try:
            return py.error.checked_call(os.utime, self.strpath, (-1, mtime))
        except py.error.EINVAL:
            return py.error.checked_call(os.utime, self.strpath, (self.atime(), mtime))

def stat(self, raising=True):
        """ Return an os.stat() tuple. """
        if raising == True:
            return Stat(self, py.error.checked_call(os.stat, self.strpath))
        try:
            return Stat(self, os.stat(self.strpath))
        except KeyboardInterrupt:
            raise
        except Exception:
            return None

def open(self, mode='r', ensure=False, encoding=None):
        """ return an opened file with the given mode.

        If ensure is True, create parent directories if needed.
        """
        if ensure:
            self.dirpath().ensure(dir=1)
        if encoding:
            return py.error.checked_call(io.open, self.strpath, mode, encoding=encoding)
        return py.error.checked_call(open, self.strpath, mode)