demo_mongodb_insert_many.py:
➜ begtut>python demo_mongodb_insert_many.py
[ObjectId('5b19112f2ddb101964065487'), ObjectId('5b19112f2ddb101964065488'), ObjectId('5b19112f2ddb101964065489'), ObjectId('5b19112f2ddb10196406548a'), ObjectId('5b19112f2ddb10196406548b'), ObjectId('5b19112f2ddb10196406548c'), ObjectId('5b19112f2ddb10196406548d'), ObjectId('5b19112f2ddb10196406548e'), ObjectId('5b19112f2ddb10196406548f'), ObjectId('5b19112f2ddb101964065490'), ObjectId('5b19112f2ddb101964065491'), ObjectId('5b19112f2ddb101964065492')]