File format filter example
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.. code-block:: python

 from terapy.files.base import FileFilter

 class FileFilterExample(FileFilter):
    """
        File filter class example
        
    """
    def __init__(self):
        FileFilter.__init__(self)
        self.ext = ["*.*"] # list of file extensions handled by this filter (list of str) 
        self.desc = "Example files" # name of file type (str)
        self.can_save = True # if True, this filter can be used to save data
        self.can_read = True # if True, this filter can be used to load data
        self.multi_data = False # if True, this filter can save multiple datasets in one file 
    
    def read(self,fname):
        """
            Read given file name.
            Parameters:
                fname    -    file name (str)
            Output:
                list of data (list of DataArray)
        """
        # Insert here what the filter should do to read a file
        return []

    def save(self, fname, data):
        """
            Save data to given file name.
            Parameters:
                fname    -    file name (str)
                data     -    data (DataArray)
        """
        # Insert here what the filter should do to save some data to a file
        return True