python + mongodb_2

from pymongo import MongoClient

client = MongoClient("mongodb://192.168.253.133:27017/")
db = client.test
c = db.book
dataCnt = c.count()
if dataCnt == 0:
    print("dataCnt => {} : 출력할 데이터의 갯수가 없습니다. ".format(dataCnt))
else: # dataCnt != 0
    #print("dataCnt => {}".format(dataCnt))
    s = c.find()
    for i in s:
        #print ("type(i) => {}".format(type(i)))
        print (i['hash'])