Environment variables provide a great way to share information into an application, and being able to read environment variables is a key skill for programming.
You will need basic Python programming and datetime skills for this lab:
– [Certified Associate in Python Programming Certification](https://linuxacademy.com/cp/modules/view/id/470)
– [Python’s os module](https://docs.python.org/3/library/os.html#)
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Write Test
Using the best practice, Test-Driven Development, first write a test that will check to make sure your result matches what is wanted. There is a
# testsection for your code. Thetest_printer_config.inifile contains the result you should check against. Rememberstreamsandfile i/oto read the resulting file, the test file, and assert they are equal.After you have written the test, run
python write_config.py.This should result in an
AssertionErrorwhich you will fix in the next step.import configparser import os # data to be used data_list = [ ["author", "title", "pages", "due_date", "genre", "isbn"], ["Thompson, Keith", "Oh Python! My Python!", 1200, "2020-11-15", "biography", "000-1-000000-00-1"], ["Fritts, Larry", "Fun with Django", 150, "2020-06-23", "satire", "00-2-000000-00-2"] ] novel_text = "Numquam labore labore tempora. Dolore dolorem quisquam aliquam eius dolor non ipsum. Dolorem est velit tempora quaerat. Est magnam porro voluptatem dolore. Adipisci voluptatem consectetur dolore voluptatem voluptatem neque. Adipisci non modi quiquia etincidunt quisquam. Etincidunt consectetur dolore ut. Quaerat ut adipisci sit aliquam quisquam ut. Voluptatem labore porro porro.nnPorro modi numquam non sed dolor. Consectetur dolor adipisci quaerat aliquam adipisci. Etincidunt porro modi dolor neque numquam magnam neque. Ipsum consectetur ut eius ut. Dolor ut modi non est tempora labore sit.nnEtincidunt voluptatem quaerat consectetur sed est etincidunt ipsum. Ut adipisci numquam etincidunt porro porro. Dolore eius modi aliquam. Velit amet sed quaerat etincidunt est. Ut consectetur modi ipsum sed aliquam. Amet tempora quiquia eius voluptatem aliquam dolore ut. Etincidunt dolor non voluptatem eius sed non adipisci." # instantiate the configparser object config = configparser.ConfigParser() # add default section config["DEFAULT"] = { "pub_house": "Atlantic Publishing", "number_of_books": '2' } # add first book config["book1"] = { "author": data_list[1][0], "title": data_list[1][1], "genre": data_list[1][4], "text": novel_text } # add second book config["book2"] = { "author": data_list[2][0], "title": data_list[2][1], "genre": data_list[2][4], "text": novel_text } # print to file with open("printer_config.ini", "w") as f: config.write(f) # test # student input here with open("printer_config.ini", "r") as f: config_text = f.read() with open("test_printer_config.ini", "r") as f: expected_text = f.read() assert config_text == expected_text, f"Expected: {expected_text}nnGot: {config_text}"- Change the File So It Has Correct Information
The
DEFAULTsection ofprinter_config.inishould look like this:[DEFAULT] pub_house = Atlantic Publishing pub_house_address = 321 Publishers Way, Fargo, ND pub_house_phone = 555-555-5555The environment variables are:
- PUB_HOUSE = "Atlantic Publishing"
- PUB_HOUSE_ADDRESS = "321 Publishers Way, Fargo, ND"
- PUB_HOUSE_PHONE = "555-555-5555"
Change the code in
write_config.pyto update thedefaultsection.import configparser import os # data to be used data_list = [ ["author", "title", "pages", "due_date", "genre", "isbn"], ["Thompson, Keith", "Oh Python! My Python!", 1200, "2020-11-15", "biography", "000-1-000000-00-1"], ["Fritts, Larry", "Fun with Django", 150, "2020-06-23", "satire", "00-2-000000-00-2"] ] novel_text = "Numquam labore labore tempora. Dolore dolorem quisquam aliquam eius dolor non ipsum. Dolorem est velit tempora quaerat. Est magnam porro voluptatem dolore. Adipisci voluptatem consectetur dolore voluptatem voluptatem neque. Adipisci non modi quiquia etincidunt quisquam. Etincidunt consectetur dolore ut. Quaerat ut adipisci sit aliquam quisquam ut. Voluptatem labore porro porro.nnPorro modi numquam non sed dolor. Consectetur dolor adipisci quaerat aliquam adipisci. Etincidunt porro modi dolor neque numquam magnam neque. Ipsum consectetur ut eius ut. Dolor ut modi non est tempora labore sit.nnEtincidunt voluptatem quaerat consectetur sed est etincidunt ipsum. Ut adipisci numquam etincidunt porro porro. Dolore eius modi aliquam. Velit amet sed quaerat etincidunt est. Ut consectetur modi ipsum sed aliquam. Amet tempora quiquia eius voluptatem aliquam dolore ut. Etincidunt dolor non voluptatem eius sed non adipisci." # instantiate the configparser object config = configparser.ConfigParser() # add default section config["DEFAULT"] = { "pub_house": os.getenv("PUB_HOUSE"), "pub_house_address": os.getenv("PUB_HOUSE_ADDRESS"), "pub_house_phone": os.getenv("PUB_HOUSE_PHONE") } # add first book config["book1"] = { "author": data_list[1][0], "title": data_list[1][1], "genre": data_list[1][4], "text": novel_text } # add second book config["book2"] = { "author": data_list[2][0], "title": data_list[2][1], "genre": data_list[2][4], "text": novel_text } # print to file with open("printer_config.ini", "w") as f: config.write(f) # test with open("printer_config.ini", "r") as f: config_text = f.read() with open("test_printer_config.ini", "r") as f: expected_text = f.read() assert config_text == expected_textRun
python write_config.py.Congrats! You have successfully accessed environment variables using Python’s
osmodule.
