parameters: (self, domain_name, expression)
return_statement: return self._make_request(
              action='DefineExpression',
              verb='POST',
              path='/', params=params)
docstring: Configures an `Expression` for the search domain. Used to
          create new expressions and modify existing ones. If the
          expression exists, the new configuration replaces the old one.
          For more information, see `Configuring Expressions`_ in the
          Amazon CloudSearch Developer Guide .
  
          :type domain_name: string
          :param domain_name: A string that represents the name of a domain.
              Domain names are unique across the domains owned by an account
              within an AWS region. Domain names start with a letter or number
              and can contain the following characters: a-z (lowercase), 0-9, and
              - (hyphen).
  
          :type expression: dict
          :param expression: A named expression that can be evaluated at search
              time. Can be used to sort the search results, define other
              expressions, or return computed information in the search results.
docstring_summary: Configures an `Expression` for the search domain. Used to
          create new expressions and modify existing ones. If the
          expression exists, the new configuration replaces the old one.
          For more information, see `Configuring Expressions`_ in the
          Amazon CloudSearch Developer Guide .
docstring_tokens: Configures an Expression for the search domain . Used to create new expressions and modify existing ones . If the expression exists the new configuration replaces the old one . For more information see Configuring Expressions _ in the Amazon CloudSearch Developer Guide .
function: def define_expression(self, domain_name, expression):
          """
          Configures an `Expression` for the search domain. Used to
          create new expressions and modify existing ones. If the
          expression exists, the new configuration replaces the old one.
          For more information, see `Configuring Expressions`_ in the
          Amazon CloudSearch Developer Guide .
  
          :type domain_name: string
          :param domain_name: A string that represents the name of a domain.
              Domain names are unique across the domains owned by an account
              within an AWS region. Domain names start with a letter or number
              and can contain the following characters: a-z (lowercase), 0-9, and
              - (hyphen).
  
          :type expression: dict
          :param expression: A named expression that can be evaluated at search
              time. Can be used to sort the search results, define other
              expressions, or return computed information in the search results.
  
          """
          params = {'DomainName': domain_name, }
          self.build_complex_param(params, 'Expression',
                                   expression)
          return self._make_request(
              action='DefineExpression',
              verb='POST',
              path='/', params=params)
function_tokens: def define_expression ( self , domain_name , expression ) : params = { 'DomainName' : domain_name , } self . build_complex_param ( params , 'Expression' , expression ) return self . _make_request ( action = 'DefineExpression' , verb = 'POST' , path = '/' , params = params )