Mongodb创建索引.

添加唯一索引.

from pymongo import MongoClient

# 给 coll 的 test_id 字段创建唯一索引
client = MongoClient('host', port=27017)
coll = client['db']['coll']
coll.ensure_index('test_id', unique=True)
Last modification：February 21, 2020
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