configparser.ConfigParser.readfp()

readfp(fp, filename=None)

For existing code calling readfp() with arguments which don’t support iteration, the following generator may be used as a wrapper around the file-like object:

def readline_generator(f):
    line = f.readline()
    while line:
        yield line
        line = f.readline()

Instead of parser.readfp(f) use parser.read_file(readline_generator(f)).