How to use the xlwings.main.Book function in xlwings

sheet : Sheet, default None
        Sheet object. If none provided, the first sheet of a new workbook is used.

    Examples
    --------

    >>> import xlwings as xw
    >>> import pandas as pd
    >>> import numpy as np
    >>> df = pd.DataFrame(np.random.rand(10, 4), columns=['a', 'b', 'c', 'd'])
    >>> xw.view(df)

    .. versionadded:: 0.7.1
    """
    if sheet is None:
        sheet = Book().sheets.active
    else:
        sheet.clear()

    sheet.range('A1').value = obj
    sheet.autofit()

wb = xw.Book.caller()
                wb.sheets[0].range('A1').value = 1

        To be able to easily invoke such code from Python for debugging, use ``xw.Book.set_mock_caller()``.

        .. versionadded:: 0.3.0
        """
        wb, from_xl, hwnd = None, None, None
        for arg in sys.argv:
            if arg.startswith('--wb='):
                wb = arg.split('=')[1].strip()
            elif arg.startswith('--from_xl'):
                from_xl = arg.split('=')[1].strip()
            elif arg.startswith('--hwnd'):
                hwnd = arg.split('=')[1].strip()
        if hasattr(Book, '_mock_caller'):
            # Use mocking Book, see Book.set_mock_caller()
            return cls(impl=Book._mock_caller.impl)
        elif from_xl == '1':
            fullname = wb.lower()
            if sys.platform.startswith('win'):
                app = App(impl=xlplatform.App(xl=int(hwnd)))
                if not PY3 and isinstance(fullname, str):
                    fullname = fullname.decode('mbcs')
                return cls(impl=app.books.open(fullname).impl)
            else:
                # On Mac, the same file open in two instances is not supported
                if PY3 and apps.active.version < 15:
                    fullname = fullname.encode('utf-8', 'surrogateescape').decode('mac_latin2')
                elif not PY3 and isinstance(fullname, str):
                    if apps.active.version < 15:
                        fullname = fullname.decode('mac_latin2')

def add(self):
        """
        Creates a new Book. The new Book becomes the active Book. Returns a Book object.
        """
        return Book(impl=self.impl.add())

def active(self):
        """
        Returns the active Book.
        """
        return Book(impl=self.impl.active)

fullname = wb.lower()
            if sys.platform.startswith('win'):
                app = App(impl=xlplatform.App(xl=int(hwnd)))
                if not PY3 and isinstance(fullname, str):
                    fullname = fullname.decode('mbcs')
                return cls(impl=app.books.open(fullname).impl)
            else:
                # On Mac, the same file open in two instances is not supported
                if PY3 and apps.active.version < 15:
                    fullname = fullname.encode('utf-8', 'surrogateescape').decode('mac_latin2')
                elif not PY3 and isinstance(fullname, str):
                    if apps.active.version < 15:
                        fullname = fullname.decode('mac_latin2')
                    else:
                        fullname = fullname.decode('utf-8')
                return cls(impl=Book(fullname).impl)
        elif xlplatform.BOOK_CALLER:
            # Called via OPTIMIZED_CONNECTION = True
            return cls(impl=xlplatform.Book(xlplatform.BOOK_CALLER))
        else:
            raise Exception('Book.caller() must not be called directly. Call through Excel or set a mock caller '
                            'first with Book.set_mock_caller().')

def parent(self):
        """
        Returns the parent of the chart.

        .. versionadded:: 0.9.0
        """
        impl = self.impl.parent
        if isinstance(impl, xlplatform.Book):
            return Book(impl=self.impl.parent)
        else:
            return Sheet(impl=self.impl.parent)

def book(self):
        """Returns the Book of the specified Sheet. Read-only."""
        return Book(impl=self.impl.book)

try:            
            impl = self.impl(name)
            # on windows, samefile only available on Py>=3.2
            if hasattr(os.path, 'samefile'):
                throw = not os.path.samefile(impl.fullname, fullname)
            else:
                throw = (os.path.normpath(os.path.realpath(impl.fullname.lower())) != os.path.normpath(fullname.lower()))
            if throw:
                raise ValueError(
                    "Cannot open two workbooks named '%s', even if they are saved in different locations." % name
                )
        except KeyError:
            impl = self.impl.open(fullname, update_links, read_only, format, password, write_res_password,
                                  ignore_read_only_recommended, origin, delimiter, editable, notify, converter,
                                  add_to_mru, local, corrupt_load)
        return Book(impl=impl)

def __eq__(self, other):
        return isinstance(other, Book) and self.app == other.app and self.name == other.name

def run(self, *args):
        args = [i.api
                if isinstance(i, (App, Book, Sheet, Range, Shape, Chart, Picture, Name))
                else i for i in args]
        return self.app.impl.run(self.macro, args)