biopython脚本出现错误“无效语法”

def batch_iterator():
    entry=True # to make sure the loop run once
    while entry:
        batch=[]
        while len(batch) < batch_size:
            try:
                entry=iterator.next()
            except StopIteration:
                entry=None
            if entry is None:
                #end of file
                break
            batch.append(entry)
        if batch:
            yield batch
record_iter=SeqIO.parse(open('/home/to/file/sorted_sequence.fa', 'fasta')
for i, batch in enumerate (batch_iterator(record_iter, 93)):
    filename='gene_%i.fasta' % (i + 1)
    with open('/home/path/files/', filename, 'w') as ouput_handle:
        count=SeqIO.write(batch, ouput_handle, 'fasta')
    print ('Wrote %i records to %s' % (count, filename))

在此行中: 对于i,枚举中的批处理(batch\u迭代器(record\u iter,93)): 正在给我 语法错误:无效语法 . 但是我看不到错误,有人能帮我找到吗? http://biopython.org/wiki/Split_large_file 谢谢