WEBVTT 00:00.000 --> 00:16.400 In this video, we will learn how Python modules work, apply math and logic in programming, 00:16.400 --> 00:18.560 what are modules. 00:18.560 --> 00:23.800 Modules are Python toolkits with ready-to-use functions and tools, saving time by providing 00:23.800 --> 00:29.960 pre-built solutions for tasks like math, dates, or random selections. 00:29.960 --> 00:34.760 Let's understand how modules work by developing a real-life program, a water conservation 00:34.760 --> 00:36.280 tracker. 00:36.280 --> 00:41.320 This program will use modules like date time and random to calculate water savings, share 00:41.320 --> 00:47.080 daily tips, and track your family's progress in saving water. 00:47.080 --> 00:49.840 Import libraries and setup. 00:49.840 --> 00:51.080 Import date time. 00:51.080 --> 00:54.560 It provides classes for manipulating dates and times. 00:54.560 --> 00:55.760 Import random. 00:55.760 --> 00:58.760 It generates random numbers and selections. 00:58.760 --> 01:01.760 First we need to collect information from the user. 01:01.760 --> 01:05.480 Family members is equal to int input. 01:05.480 --> 01:10.200 Enter the number of family members. 01:10.200 --> 01:14.800 Time reduced is equal to int input. 01:14.800 --> 01:21.600 Enter the number of minutes each person reduces their shower time. 01:21.600 --> 01:25.880 We ask for the number of family members and how many minutes each person reduces their 01:25.880 --> 01:27.600 shower time. 01:27.600 --> 01:33.960 Now that we have the user's input, we calculate how much water is saved daily. 01:33.960 --> 01:38.520 Let's say that every one minute of reduced shower time saves approximately nine liters 01:38.520 --> 01:40.320 of water. 01:40.320 --> 01:46.200 Multiply the time reduced by nine to get water saved per person. 01:46.200 --> 01:52.040 Water saved per person is equal to time reduced asterisk nine. 01:52.040 --> 01:58.040 Multiply it by the number of family members to get the total daily water savings. 01:58.040 --> 02:04.640 Total water saved is equal to family members asterisk water saved per person. 02:04.640 --> 02:07.320 Print F backslash in. 02:07.320 --> 02:12.000 Your family saves approximately total water saved. 02:12.000 --> 02:15.200 Leaders of water per day. 02:15.200 --> 02:17.200 Randomized tip generation. 02:17.200 --> 02:20.640 This add a random tip that helps people save water. 02:20.640 --> 02:22.400 Create a list of tips. 02:22.400 --> 02:25.440 Tips is equal to open bracket. 02:25.440 --> 02:29.480 Turn off the tap while brushing your teeth. 02:29.480 --> 02:32.920 Fix leaky faucets to save water. 02:32.920 --> 02:35.960 Collect rainwater for watering plants. 02:35.960 --> 02:40.600 Use a bucket instead of a hose to wash your car. 02:40.600 --> 02:44.480 Only run your washing machine with a full load. 02:44.480 --> 02:45.960 Make bracket. 02:45.960 --> 02:53.240 Daily tip is equal to random dot choice tips print F backslash in today's water saving 02:53.240 --> 02:55.640 tip daily tip. 02:55.640 --> 03:01.080 Here we use the random dot choice function to select a tip randomly date manipulation 03:01.080 --> 03:02.760 with date time. 03:02.760 --> 03:07.600 We want to track how long the family has been following their water saving habit so ask 03:07.600 --> 03:13.440 the user to enter the start date start date is equal to input enter the start date of 03:13.440 --> 03:18.240 the initiative year month date. 03:18.240 --> 03:25.200 Start date object is equal to date time dot date time dot stearup time start date percent 03:25.200 --> 03:33.520 why percent M percent D dot date date time dot stearup time converts the users input into 03:33.520 --> 03:35.000 a date format. 03:35.000 --> 03:40.080 So we can calculate the difference between today's date and the start date current date is 03:40.080 --> 03:47.880 equal to date time dot date dot today days elapsed is equal to current date minus start 03:47.880 --> 03:55.160 date object dot days print F backslash in the water conservation initiative has been 03:55.160 --> 04:01.760 running for days elapsed days date time module is used to calculate how many days have passed 04:01.760 --> 04:09.200 since that date output and formatting now we display all the information in a clear 04:09.200 --> 04:19.280 and organized summary print backslash in water conservation tracker summary print F one 04:19.280 --> 04:28.280 total water saved daily by your family total water saved leaders print F two days since 04:28.280 --> 04:38.600 the initiative started days elapsed days print F three today's tip daily tip 04:39.560 --> 04:43.960 this gives the user a final report of their water saving efforts save the program with 04:43.960 --> 04:50.840 a name like water conservation tracker click run button to see your daily water savings 04:50.840 --> 04:59.680 days tracked and a water saving tip now we learned how to take user input perform calculations 04:59.680 --> 05:02.800 use randomization and track days in Python