How does Python count the number of concurrency in time

Concept:

The datetime (date time) module is mainly used to express the date, which is what we often call the year, month, day, hour and second.

A datetime object is a combination of date objects and time objects.

# Import the three core classes of the datetime module

From datetime import datetime # class one:datetime date time

From datetime import date # class two:date date

From datetime import time # class three:time time

Achieve:

# coding:utf-8# 1. Import module # datatime module is used to define time and time addition and subtraction # MySQLdb module is used for Python2.0 connection database, Python3.0 connection database module uses pymysql# xlwt module is excel operation module, which is used to write data to import datetimeimport MySQLdbimport xlwt# 2 in excel. Connect to the database, get the data # MySQLdb.connect defines the properties of the connection database # myconn.cursor () defines the cursor object # query_sql defines the query statement # mycursor.execute () executes the query statement, only executes the statement, and does not output the result. # mycursor.fetchall () extracts query data. All all data, one single data, how many pieces of data are fetched by many. Fetchmany (10) fetches 10 pieces of data. # mycursor.close () close cursor # myconn.close () close connection myconn = MySQLdb.connect (host='1',user='wn',passwd='9eu',db='bs',charset='utf8') mycursor = myconn.cursor () query_sql = 'select JOIN_TIME LEAVE_TIME from commfee where JOIN_TIME between '2019-12-24 15 mycursor.execute' (query_sql) sql_result = mycursor.fetchall () mycursor.close () myconn.close () # 3. Define the global parameter # sum1 = [] define the list sum1,sum1 time list used to generate comparisons # sum2 = [] define the list sum2,sum2 uses to generate concurrent numbers sum1 = [] sum2 = [] # 4. Define the data filter function # compare_time comparison time, with the first value of the start time. # start_time = [sql_ result [I] [0] for i in range (0Len (sql_result))] splits the query result into two lists, start_time and end_time. # compare_time < start_ timeLen (sql_result)-1], compare the compare_time time with the time in the start_time list # compare_time + = datetime.timedelta (seconds=1). After each comparison, the compare_time time + time datetime.timedelta (seconds=1), timedelta (seconds=1) time change 1s# sum1.append (compare_time), and the resulting compare_time is written to the sum1 list. Def query_data (): compare_time = sql_result [0] [0] start_time = [sql_ result [I] [0] for i in range (0 sql_ Len (sql_result))] end_time = [sql_ result [I] [1] for i in range (0) Len (sql_result))] while compare_time < start_ timeLen (sql_result)-1]: compare_time + = datetime.timedelta (seconds=1) count1 = 0 count2 = 0 for time1 in start_time: if time1