用python代码写从vott导出的json文件中抽出标签的名字和数量。总共标签数，同一个标签有多少处图片被标注。

在Python中，你可以使用`json`库解析VOTT导出的JSON文件，然后遍历数据结构以获取每个标签及其对应的图片数量。假设JSON文件内容类似这样：

{
  "tags": [
    {
      "name": "tag1",
      "images": [
        {"image_id": "img1", "x": ..., "y": ...},
        {"image_id": "img2", "x": ..., "y": ...}
      ]
    },
    {
      "name": "tag2",
      "images": [
        {"image_id": "img1", "x": ..., "y": ...},
        {"image_id": "img3", "x": ..., "y": ...}
      ]
    }
  ]
}

以下是一个简单的函数示例，它会计算总标签数和每个标签出现的次数：

import json

def count_tags(json_file_path):
    with open(json_file_path, 'r') as f:
        data = json.load(f)

    tags = data.get('tags', [])
    tag_count = {tag['name']: len(tag['images']) for tag in tags}
    total_labels = len(tags)

    return tag_count, total_labels

# 使用函数并打印结果
tag_info = count_tags('path_to_your_vott_json.json')
tag_names_and_counts = dict(tag_info[0])
total_tag_count = tag_info[1]

print("Total labels:", total_tag_count)
print("Tag counts:")
for name, count in tag_names_and_counts.items():
    print(f"{name}: {count} occurrences")

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