parameters: (self, key, value)
docstring: A wrapper around add_column(s).  Key can be either a list or a str.  If
          value is an SArray, it is added to the SFrame as a column.  If it is a
          constant value (int, str, or float), then a column is created where
          every entry is equal to the constant value.  Existing columns can also
          be replaced using this wrapper.
docstring_summary: A wrapper around add_column(s).  Key can be either a list or a str.  If
          value is an SArray, it is added to the SFrame as a column.  If it is a
          constant value (int, str, or float), then a column is created where
          every entry is equal to the constant value.  Existing columns can also
          be replaced using this wrapper.
docstring_tokens: A wrapper around add_column ( s ) . Key can be either a list or a str . If value is an SArray it is added to the SFrame as a column . If it is a constant value ( int str or float ) then a column is created where every entry is equal to the constant value . Existing columns can also be replaced using this wrapper .
function: def __setitem__(self, key, value):
          """
          A wrapper around add_column(s).  Key can be either a list or a str.  If
          value is an SArray, it is added to the SFrame as a column.  If it is a
          constant value (int, str, or float), then a column is created where
          every entry is equal to the constant value.  Existing columns can also
          be replaced using this wrapper.
          """
          if (key in ['__id', '__src_id', '__dst_id']):
              raise KeyError('Cannot modify column %s. Changing __id column will\
                      change the graph structure' % key)
          else:
              self.__is_dirty__ = True
              super(GFrame, self).__setitem__(key, value)
function_tokens: def __setitem__ ( self , key , value ) : if ( key in [ '__id' , '__src_id' , '__dst_id' ] ) : raise KeyError ( 'Cannot modify column %s. Changing __id column will\
                      change the graph structure' % key ) else : self . __is_dirty__ = True super ( GFrame , self ) . __setitem__ ( key , value )