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python/mecha-munch-management/HINTS.md

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+# Hints
+
+## General
+
+Remember, this is an [MVP][mvp].
+That means you don't need to get too fancy with error handling or different "edge case" scenarios.
+It's OK to be simple and direct with the functions you are writing.
+
+The dictionary section of the [official tutorial][dicts-docs] and the mapping type [official library reference][mapping-types-dict] are excellent places to look for more help with all these methods.
+
+
+## 1. Add Item(s) to the Users Shopping Cart
+
+- You will need to iterate through each item in `items_to_add`.
+- You can avoid a `KeyError` when a key is missing by using a `dict` [method][set-default] that takes a _default value_ as one of its arguments.
+- It is also possible to accomplish the same thing manually in the `loop` by using some checking and error handling, but the `dict` method is easier.
+
+## 2. Read in Items Listed in the Users Notes App
+
+- Remember, Python's got a method for _everything_. This one is a _classmethod_ that's an easy way to [populate a `dict`][fromkeys] with keys.
+- This `dict` method returns a _new dictionary_, populated with default values. If no value is given, the default value will become `None`
+
+## 3. Update Recipe "Ideas" Section
+
+- Don't overthink this one!  This can be solved in **one** `dict` method call.
+- The key word here is .... [_update_][update].
+
+## 4. Sort the Items in the User Cart
+
+- What method would you call to get an [iterable view of items][items] in the dictionary?
+- If you had a `list` or a `tuple`, what [`built-in`][builtins] function might you use to sort them?
+- The built-in function you want is the one that returns a _copy_, and doesn't mutate the original.
+
+## 5. Send User Shopping Cart to Store for Fulfillment
+
+- Having a fresh, empty dictionary here as the `fulfillment_cart` might be handy for adding in items.
+- `Looping` through the members of the cart might be the most direct way of accessing things here.
+- What method would you call to get an [iterable view of just the keys][keys] of the dictionary?
+- Remember that you can get the `value` of a given key by using `<dict name>[<key_name>]` syntax.
+- If you had a `list` or a `tuple`, what [`built-in`][builtins] function might you use to sort them?
+- Remember that the `built-in` function can take an optional `reverse=True` argument.
+
+## 6. Update the Store Inventory to Reflect what a User Has Ordered.
+
+- There is a method that will give you an iterable view of (`key`, `value`) pairs from the dictionary.
+- You can access an item in a _nested tuple_ using _bracket notation_:  `<tuple>[<nested_tuple>][<index_of_value>]`
+- Don't forget to check if an inventory count falls to zero, you'll need to add in the "Out of Stock" message.
+
+[builtins]: https://docs.python.org/3/library/functions.html
+[dicts-docs]: https://docs.python.org/3/tutorial/datastructures.html#dictionaries
+[fromkeys]: https://docs.python.org/3/library/stdtypes.html#dict.fromkeys
+[items]: https://docs.python.org/3/library/stdtypes.html#dict.items
+[keys]: https://docs.python.org/3/library/stdtypes.html#dict.keys
+[mapping-types-dict]: https://docs.python.org/3/library/stdtypes.html#mapping-types-dict
+[mvp]: https://en.wikipedia.org/wiki/Minimum_viable_product
+[set-default]: https://docs.python.org/3/library/stdtypes.html#dict.setdefault
+[update]: https://docs.python.org/3/library/stdtypes.html#dict.update