作者:不可能爱你啊 | 来源:互联网 | 2022-10-31 19:12
我有以下代码:
client = MongoClient(uri)
db = client['my_db']
print(db.collection_names())
#print(db.list_collection_names())
我得到了错误
连接打印(db.collection_names())中的第17行的文件“ C:\ Users \ gwerner004 \ eclipse-workspace \ MongoTestRasa \ FirstTest.py”文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ database.py“,第715行,位于collection_names nameOnly= True,** kws)]文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \在list_collections ** kwargs中的第677行,“ site-packages \ pymongo \ database.py”中,文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ database.py “,第651行,在_list_collections游标中= self._command(sock_info,cmd,slave_okay)[”游标“]文件” C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ database.py”,第514行,在_command client = self .__ client中)文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ pool.py”,行579,在命令unacknowledged = unacknowledged中) “ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ network.py”,行150,在命令parse_write_concern_error = parse_write_concern_error中)文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ helpers.py“,第155行,在_check_command_response中引发OperationFailure(msg%errmsg,代码,响应)pymongo.errors.OperationFailure:不支持的投影选项:$ substr在命令parse_write_concern_error = parse_write_concern_error中,行150,在命令“未确认=未确认”中文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ network.py”中,行150 :_check_command_response中的第155行:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ helpers.py“,提高OperationFailure(msg%errmsg,代码,响应)pymongo.errors.OperationFailure :不支持的投影选项:$ substr在命令parse_write_concern_error = parse_write_concern_error中,行150,在命令“未确认=未确认”中文件“ C:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ network.py”中,行150 :_check_command_response中的第155行:\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ helpers.py“,提高OperationFailure(msg%errmsg,代码,响应)pymongo.errors.OperationFailure :不支持的投影选项:$ substr\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ helpers.py“,第155行,在_check_command_response中提高OperationFailure(msg%errmsg,代码,响应)pymongo.errors.OperationFailure:不支持的投影选项:$ substr\ Users \ gwerner004 \ AppData \ Local \ Programs \ Python \ Python36 \ lib \ site-packages \ pymongo \ helpers.py“,第155行,在_check_command_response中提高OperationFailure(msg%errmsg,代码,响应)pymongo.errors.OperationFailure:不支持的投影选项:$ substr
为什么这样的基本操作会失败?我在Windows 10上运行并使用Python 3.6.7。我的PyMongo是3.7.2