def __init__(self, wkp_index=0):
    self.__wkps = sppasWkps()
    if len(self.__wkps) == 0:
        self.__wkps.new('Blank')
    self.data = None
    self.__current = self.load_data(wkp_index)

def load_data(self, index=None):
    """Set the data saved of the current workspace.

        If the file of the workspace does not exist, return an empty
        instance of sppasWorkspace.

        :param index: (int) Index of the workspace to get data
        :returns: (int) Index of the loaded workspace
        :raises: IndexError

        """
    if index is None:
        index = self.__current
    self.data = self.__wkps.load_data(index)
    return index

def get_size(self):
    """Return the number of workspaces.

        :returns: (int)

        """
    return len(self.__wkps)

def get_wkp_name(self, index=None):
    """Return the name of the current workspace.

        :param index: (int) Index of the workspace to get name
        :returns: (str)

        """
    if index is None:
        index = self.__current
    return self.__wkps[index]

def get_wkp_index(self, name):
    """Return the index of the given workspace name.

        :param name: (str) Workspace name
        :returns: (int)
        :raises: (ValueError)

        """
    return self.__wkps.index(name)

def get_wkp_current_index(self):
    """Return the index of the current workspace.

        :returns: (int)

        """
    return self.__current

def switch_to(self, index):
    """Set the current workspace at the given index.

        :param index: (int) Index of the workspace to switch on

        """
    wkp_name = self.__wkps[index]
    self.__current = index
    self.load_data()

def pin(self, new_name):
    """Append a new empty workspace and set it the current one.

        :param new_name: (str) Name of the new workspace.

        """
    new_name = self.__wkps.new(new_name)
    index = self.__wkps.index(new_name)
    self.switch_to(index)

def import_from(self, filename):
    """Append a new imported workspace.

        A ".wjson" extension is expected.

        :param filename: (str) Name of the file to import.

        """
    try:
        with open(filename, 'r'):
            pass
    except IOError:
        raise
    wkp_name = self.__wkps.import_from_file(filename)

def export_to(self, filename):
    """Save the current workspace into an external file.

        A ".wjson" extension is expected but not verified.

        :param filename: (str) Name of the exported file.

        """
    self.__wkps.export_to_file(self.__current, filename)

def rename(self, new_name):
    """Set a new name to the current workspace.

        :param new_name: (str) New name to assign to the workspace.

        """
    u_name = self.__wkps.rename(self.__current, new_name)

def save(self, data, index=None):
    """Save the given data to the active workspace or to the given one.

        :param data: (sppasWorkspace)
        :param index: (int) Save data to the workspace with this index
        :raises: IndexError, IOError

        """
    if index is None:
        index = self.__current
    self.__wkps.save_data(data, index)

def remove(self, index):
    """Remove a workspace of the list and delete the corresponding file.

        :param index: (int)

        """
    if index == self.__current:
        raise IndexError("The currently displayed workspace can't be removed")
    if index == 0:
        raise IndexError("The 'Blank' workspace can't be removed")
    self.__wkps.delete(index)