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Home | Lecture 3 | Problem 3.1 | Problem 3.2 | Problem 3.3 | Problem 3.4

Grocery List

Suppose that you’re in the habit of making a list of items you need from the grocery store.

In a file called grocery.py, implement a program that prompts the user for items, one per line, until the user inputs control-d (which is a common way of ending one’s input to a program). Then output the user’s grocery list in all uppercase, sorted alphabetically by item, prefixing each line with the number of times the user inputted that item. No need to pluralize the items. Treat the user’s input case-insensitively.

Hints

Hints

  • Note that you can detect when the user has inputted control-d by catching an [EOFError](https://docs.python.org/3/library/exceptions.html#EOFError) with code like:

      try:
  	item = input()
  except EOFError:
  	...

  • Odds are you’ll want to store your grocery list as a dict.

  • Note that a dict comes with quite a few methods, per docs.python.org/3/library/stdtypes.html#mapping-types-dict, among them get, and supports operations like:

      d[key]

and

	if key in d:
		...

wherein d is a dict and key is a str.

Be sure to avoid or catch any [KeyError](https://docs.python.org/3/library/exceptions.html#KeyError).

Before You Begin

From the root of your repository execute cd 3-Exceptions So your current working directory is ...

	/3-Exceptions $:

Next execute

	mkdir grocery

to make a folder called grocery in your codespace.

Then execute

	cd grocery

to change directories into that folder. You should now see your terminal prompt as /3-Exceptions/grocery $. You can now execute

	code grocery.py

to make a file called grocery.py where you’ll write your program.

How to Test

Here’s how to test your code manually:

  1. Run your program with python grocery.py. Type mango and press Enter, then type strawberry and press Enter, followed by control-d. Your program should output:

     1 MANGO
 1 STRAWBERRY

  2. Run your program with python grocery.py. Type milk and press Enter, then type milk again and press Enter, followed by control-d. Your program should output:

     2 MILK

  3. Run your program with python grocery.py. Type tortilla and press Enter, then type sweet potato and press Enter, followed by control-d. Your program should output:

     1 SWEET POTATO
 1 TORTILLA

Commit your program to GITHUB

At the /3-Exceptions/grocery $ prompt in your terminal:

	git add -A

Add all changed files in the repository to be committed

	git commit -m “Upload completed grocery.py“

Commit all changes in the REPO with the comment “Upload completed grocery.py“ note: If the file is not complete, adjust the comment to describes what is being commited

	git push

Push all changes to the REPO