<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def download_file(local_filename, url, clobber=False):
 """Download the given file. Clobber overwrites file if exists."""

    dir_name = os.path.dirname(local_filename)
    mkdirs(dir_name)

    if clobber or not os.path.exists(local_filename):
        i = requests.get(url)

        # if not exists
        if i.status_code == 404:
            print('Failed to download file:', local_filename, url)
            return False

        # write out in 1MB chunks
        chunk_size_in_bytes = 1024*1024  # 1MB
        with open(local_filename, 'wb') as local_file:
            for chunk in i.iter_content(chunk_size=chunk_size_in_bytes):
                local_file.write(chunk)

    return True