Some simple operations of MongoDB

# import Pymongo   #导入pymongo库
# client = Pymongo. Mongoclient (' localhost ', 27017)  connects Python with MONGO database (localhost is local)
# Walden = client[' Walden '] give the database a name on the left is the name in Python, and the right bracket is the name in the database environment
# sheet_line = walden[' sheet_line ') create a sheet of a database
# path = ' D:\BaiduNetdiskDownload\walden.txt '
# with open (path, ' R ') as F:
#     lines = F.readlines ()   reads each line in the file
# for     index,line in Enumerate (lines): The enumerate function is the location and data of the looping data
#         Data ={
#             ' index ': index,
#             ' line ': line,
#             ' words ': Len (Line.split ())
#
#         }
#         Sheet_line.insert_one data is loaded into the database
#    $LT/$lte/$GT/$gte/$ne, in turn equivalent to </<=/>/>=/!=
# for item in Sheet_line.find ({' words ': {' $lt ': 5}}):
#     Print (item)

Some simple operations for MongoDB