#NEWLINE# def __init__( self , field_mask = None ) : #NEWLINE# #INDENT# 'Initializes the tree by FieldMask.' #NEWLINE# self . _root = { #NEWLINE# #INDENT# #NEWLINE# #UNINDENT# } #NEWLINE# if self : #NEWLINE# #INDENT# self . MergeFromFieldMask ( field_mask )