human
Solve the following python programming problem given the following code:
def _construct_data_source_url(url, job_exec_id) : 
    'Resolve placeholders in data_source URL.

    Supported placeholders:

    * %RANDSTR(len)% - will be replaced with random string of lowercase
                       letters of length `len`.
    * %JOB_EXEC_ID%  - will be replaced with the job execution ID.

    ' 
    def _randstr(match) : 
        len = int (match.group (1)) 
        return ''.join ((random.choice (string.ascii_lowercase) for _ in six.moves.range (len))) 
url = url.replace ('%JOB_EXEC_ID%', _randstr) 
    url = re.sub ('%RANDSTR\\((\\d+)\\)%', _randstr, url) 
    return url 

    
    

    Fix the buggy line: url = url.replace ('%JOB_EXEC_ID%', _randstr)
assistant
#Here is Python program to fix the buggy line: url = url.

url = url.replace ('%JOB_EXEC_ID%', job_exec_id)