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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read_embedded(self, data, parent_var_type):
 """Read method for "mixed" variable type. .. Note:: The ``read()`` method will automatically determine if the input is a variable or needs to be searched for embedded variables. There usually is no reason to call this method directly. This method will automatically covert variables embedded in a string with data retrieved from DB. If there are no keys/variables the raw string will be returned. Examples:: DB Values #App:7979:variable_name!String: "embedded \\"variable\\"" #App:7979:two!String: "two" #App:7979:variable_name!StringArray: ["one", "two", "three"] Examples 1: Input: "This input has a embedded #App:7979:variable_name!String" Examples 2: Input: ["one", #App:7979:two!String, "three"] Examples 3: Input: [{ "key": "embedded string", "value": "This input has a embedded #App:7979:variable_name!String" }, { "key": "string array", "value": #App:7979:variable_name!StringArray }, { "key": "string", "value": #App:7979:variable_name!String }] Args: data (string):
 The data to parsed and updated from the DB. parent_var_type (string):
 The parent type of the embedded variable. Returns: (string):
 Results retrieved from DB """

        if data is None:
            return data

        # iterate all matching variables
        for var in (v.group(0) for v in re.finditer(self._variable_parse, str(data))):
            self.tcex.log.debug(
                'embedded variable: {}, parent_var_type: {}'.format(var, parent_var_type)
            )
            key_type = self.variable_type(var)
            val = self.read(var)

            if val is None:
                val = ''
            elif key_type != 'String':
                var = r'"?{}"?'.format(var)  # replace quotes if they exist
                val = json.dumps(val)

            data = re.sub(var, val, data)
        return data