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我想创建一个_id名称列表,例如['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
与PyMongo出这个查询:如何获取PyMongo中的_id名称列表
> db.users.find({},{ "_id":1}).limit(10)
{ "_id" : "0" }
{ "_id" : "1" }
{ "_id" : "2" }
{ "_id" : "3" }
{ "_id" : "4" }
{ "_id" : "5" }
{ "_id" : "6" }
{ "_id" : "7" }
{ "_id" : "8" }
{ "_id" : "9" }
但是,下面的代码不会产生任何结果:
from pymongo import MongoClient
if __name__ == '__main__':
db = MongoClient()
sDB = db.test.users
for u in list(sDB.users.find({}, {"_id": 1}).limit(10)):
print "!!!", u
为什么上面的列表是空的?