从PyMongo 3.0开始，您必须使用admin.command，因为copy_databasewas removed in 3.0：

client.admin.command('copydb',
                     fromdb='source_db_name',
                     todb='target_db_name')

import pymongo
client = pymongo.MongoClient()

client.copy_database('foo', 'bar')

assert set(client['foo'].collection_names()) == set(client['bar'].collection_names())

for collection in client['foo'].collection_names():
    assert client['foo'][collection].count() == client['bar'][collection].count()

client.drop_database('foo')

我尝试了所有上述方法，但没有为我工作，下面的脚本已经为我工作，并认为它会为你工作以及.（注：con是我的数据库连接）

def rename_database(old_name,new_name):
        #copying collections and documents from old to new database
        for i in con[old_name].list_collection_names():
            con[new_name][i]
            for j in con[old_name][i].find():
                a=con[new_name][i].insert_one(j)
        #dropping old database
        con.drop_database(old_name)

#testing purpose
rename_database("test","newDbName")