Review of Lab 9. Review Lab 9. Social Network Classes/Driver Data. Lab 10 Design

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1 Review of Lab 9 If the U.S. Census Bureau wanted you to figure out the most popular names in the U.S. or the most popular baby names last year, what would you need to do to change your program? Best pracdce: add user input last, if needed Ø Hard-code the inputs while you re developing Fully automated: Review Lab 9 How can you get all the values from a dicdonary? Ø How can you turn it into a list? for filename in inputfileslist: processnamesfile(filename) Mar 28, 2017 Sprenkle - CSCI111 1 Mar 28, 2017 Sprenkle - CSCI111 2 Lab 10 Design Social Network Classes/Driver Data 3 files: person.py, socialnetwork.py, facespace.py socialnetwork.py SocialNetwork (test funcdons) Person (test funcdons) person.py facespace.py Driver Uses SocialNetwork object Gets command-line arguments Handles UI Calls methods on the SN object Person Ø Id Ø Name Ø Friends Social Network Ø People in network Driver (UI) Ø Social network What are the data types for each class s data? Mar 28, 2017 Sprenkle - CSCI111 3 Mar 28, 2017 Sprenkle - CSCI

2 SN Classes/Driver FuncDonality Towards a SoluDon and Hints Person Ø Ge[ers (accessors) Ø String rep Ø Se[ers Social Network Ø Ge[ers Ø String rep Ø Add people to network Ø Add connecdons Ø WriDng to a file Driver Ø Ge^ng user input to Read people, connecdons files Store social network to file Add a person Add connecdons Ø Summary: call appropriate methods on classes to do above How should we test these? Given stubs for each of the files social.py is the most filled out Ø Has the methods and docstrings defined Ø BUT sdll refer to the descripdon in the lab on the web for all informadon For whatever variable you re dealing with, think about its data type and API Ø SocialNetwork API handout Ø Add your Person class s API to the handout Mar 28, 2017 Sprenkle - CSCI111 5 Mar 28, 2017 Sprenkle - CSCI111 6 Problem: People Files Given a people file that has the format <num_users> <user_id> <name> <user_id_n> <name_n> Write algorithm to create Person objects to represent each person, add to SocialNetwork object Problem: ConnecDon Files Given a connecdon file that has the format Each line represents a friend/connecdon Ø Symmetric reladonship Ø Each is a friend of the other Update SocialNetwork object Mar 28, 2017 Sprenkle - CSCI111 7 Mar 28, 2017 Sprenkle - CSCI

3 UI SpecificaDon (see later slides) Checks if user entered command-line argument Ø Default files otherwise Read people, connecdons from files Repeatedly gets selected opdons from the user, undl user quits Repeatedly prompts for new selecdon if invalid opdon Executes the appropriate code for the selecdon Stops when user quits Stores the social network into the file Mar 28, 2017 Sprenkle - CSCI111 Write pseudocode 9 UI Pseudocode Use default files if only one command-line argument Read people, connecdons from files while True: display menu opdons prompt for selecdon while invalid opdon print error message prompt for selecdon break if selected quit otherwise, do selected opdon Store social network to designated file Why not a GUI? Mar 28, 2017 Sprenkle - CSCI ImplementaDon Plan 1. Implement Person class Ø Test (write test funcdon, e.g., testperson()) 2. Implement SocialNetwork class Ø Example runs in lab write up Ø Note: Methods for classes will not prompt for input; Use input parameters Ø Test 3. Implement driver program Plan for ImplemenDng a Class Write the constructor and string representadon/ print methods first Write funcdon to test them Ø See card.py for example test funcdons While more methods to implement Ø Write method Ø Test Ø REMINDER: methods should not be using input funcdon but ge^ng the input as parameters to the method Mar 28, 2017 Sprenkle - CSCI Mar 28, 2017 Sprenkle - CSCI

4 Export SocialNetwork to Files I provide method to write connecdons to a file Ø Because only want connecdon once You handle wridng to people file Ø Must be in same format that you read in Ø Just undoing the read Good test: if you read in a people file, export it to another file à original and exported file should look the same Ø If you read in that exported file, should see same social network Ø Files themselves may not be exactly the same because of order printed out Test Data SocialNetwork requires: People file, ConnecDons file Social Networks: Ø Simple Ø Hollywood Ø Randomly generated files From W&L first and last names, randomly combined, connected Could combine different ones Mar 28, 2017 Sprenkle - CSCI Mar 28, 2017 Sprenkle - CSCI We can run programs from terminal (i.e., the command-line ) and from IDLE From the command-line, can pass in arguments, similar to how we use Unix commands Ø Ex: cp <source> <dest> COMMAND-LINE ARGUMENTS Mar 28, 2017 Sprenkle - CSCI Command-line arguments Ø Ex: python3 myprog.py 3 Makes input easier Ø Don t have to retype each Dme executed Mar 28, 2017 Sprenkle - CSCI

5 Using the sys module Ø What else did we use from the sys module? python3 myprogram.py 3 python3 command_line_args.py <filename> List of arguments, named sys.argv How can we access <filename>? Ø Then we can use in our program Mar 28, 2017 Sprenkle - CSCI Using the sys module python3 command_line_args.py <filename> sys.argv command_line_args.py How can we access <filename>? Ø sys.argv is a list of the arguments Ø sys.argv[0] is the name of the program Ø sys.argv[1] is the filename <filename> 0 1 Mar 28, 2017 Sprenkle - CSCI111 command_line_args.py18 Using In general in Python: Ø sys.argv[0] is the Python program s name Have to run program from terminal (not from IDLE) Ø Can edit program in IDLE though è Useful trick: Ø If can t figure out bug in IDLE, try running from command-line May get different error message Use in Lab 10 Ease execudng FaceSpace Examples: Ø python3 facespace.py <peoplefile.txt> <connectionsfile.txt> Ø python3 facespace.py data_files/hollywood.txt data_files/hollywood_connections.txt Mar 28, 2017 Sprenkle - CSCI Mar 28, 2017 Sprenkle - CSCI