packages/vaex-core/vaex/dataframe.py
def write_virtual_meta(self):
        """Writes virtual columns, variables and their ucd,description and units.

        The default implementation is to write this to a file called virtual_meta.yaml in the directory defined by
        :func:`DataFrame.get_private_dir`. Other implementation may store this in the DataFrame file itself.

        This method is called after virtual columns or variables are added. Upon opening a file, :func:`DataFrame.update_virtual_meta`
        is called, so that the information is not lost between sessions.

        Note: opening a DataFrame twice may result in corruption of this file.

        """
        path = os.path.join(self.get_private_dir(create=True), "virtual_meta.yaml")
        virtual_names = list(self.virtual_columns.keys()) + list(self.variables.keys())
        units = {key: str(value) for key, value in self.units.items() if key in virtual_names}
        ucds = {key: value for key, value in self.ucds.items() if key in virtual_names}
        descriptions = {key: value for key, value in self.descriptions.items() if key in virtual_names}
        meta_info = dict(virtual_columns=self.virtual_columns,
                         variables=self.variables,
                         ucds=ucds, units=units, descriptions=descriptions)
        vaex.utils.write_json_or_yaml(path, meta_info)
def write_virtual_meta(self):
        path = os.path.join(self.get_private_dir(create=True), "virtual_meta.yaml")
        virtual_names = list(self.virtual_columns.keys()) + list(self.variables.keys())
        units = {key: str(value) for key, value in self.units.items() if key in virtual_names}
        ucds = {key: value for key, value in self.ucds.items() if key in virtual_names}
        descriptions = {key: value for key, value in self.descriptions.items() if key in virtual_names}
        meta_info = dict(virtual_columns=self.virtual_columns,
                         variables=self.variables,
                         ucds=ucds, units=units, descriptions=descriptions)
        vaex.utils.write_json_or_yaml(path, meta_info)
def write_virtual_meta ( self ) : path = os . path . join ( self . get_private_dir ( create = True ) , "virtual_meta.yaml" ) virtual_names = list ( self . virtual_columns . keys ( ) ) + list ( self . variables . keys ( ) ) units = { key : str ( value ) for key , value in self . units . items ( ) if key in virtual_names } ucds = { key : value for key , value in self . ucds . items ( ) if key in virtual_names } descriptions = { key : value for key , value in self . descriptions . items ( ) if key in virtual_names } meta_info = dict ( virtual_columns = self . virtual_columns , variables = self . variables , ucds = ucds , units = units , descriptions = descriptions ) vaex . utils . write_json_or_yaml ( path , meta_info )
Writes virtual columns, variables and their ucd,description and units.

        The default implementation is to write this to a file called virtual_meta.yaml in the directory defined by
        :func:`DataFrame.get_private_dir`. Other implementation may store this in the DataFrame file itself.

        This method is called after virtual columns or variables are added. Upon opening a file, :func:`DataFrame.update_virtual_meta`
        is called, so that the information is not lost between sessions.

        Note: opening a DataFrame twice may result in corruption of this file.
Writes virtual columns variables and their ucd description and units .