add task for dict chapter

first_steps/bill.rst

@@ -3,7 +3,7 @@ Receipts
 
 .. image:: receipts.jpg
 
-Photo by `@carlijeen on unsplash.com <https://unsplash.com/@carlijeen?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Carli Jeen</a> on <a href="https://unsplash.com/photos/black-ceramic-cup-with-saucer-and-cappuccino-on-brown-wooden-surface-UWRqlJcDCXA?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash>`__
+Photo by `Carli Jeen on unsplash.com <https://unsplash.com/@carlijeen?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash>`__
 
 
 In this chapter you will:

first_steps/cypher.rst

@@ -1,4 +1,4 @@
-Cesar Cypher
+Cesar Cipher
 ============
 
 .. image:: enigma.jpg
@@ -21,10 +21,10 @@ area    topic
 ======= ====================================
 
 
-Exercise 1: Cesar Cypher
+Exercise 1: Cesar Cipher
 ------------------------
 
-Execute the following code calculating a **Cesar Cypher**:
+Execute the following code calculating a **Cesar Cipher**:
 
 .. code:: python3
 

first_steps/dictionaries.rst

@@ -0,0 +1,81 @@
+Look up Prices
+==============
+
+In this chapter you will:
+-------------------------
+
+======= ====================================
+area    topic
+======= ====================================
+🚀      write a better receipt assistant
+⚙       define a dictionary
+⚙       look up values of a dictionary
+🔀      iterate through a list of dictionary keys
+🐞      fix index errors
+======= ====================================
+
+Exercise 1: Look up
+-------------------
+
+Consider we would like to look up shopping prices.
+In this chapter, we will use a **dictionary**,
+a data structure that is good for looking up items.
+
+Execute the following code:
+
+.. code:: python3
+
+   prices = {
+      "apple": 0.50,
+      "banana": 1.00,
+      "orange": 1.50,
+      "cherries": 3.00,
+   }
+   print(prices["banana"])
+
+How does the dictionary differ from a list?
+
+
+Exercise 2: Explore
+-------------------
+
+Find out what each of the expressions does to the dictionary in the center.
+
+.. figure:: dicts.png
+   :alt: dict exercise
+
+
+Exercise 3: Look up
+-------------------
+
+Now consider having the list of items in ``fruit``.
+You would like to calculate the total price.
+For that, the list and dictionary need to work together.
+
+Sort the lines and indent them properly:
+
+   print(total)
+   total += prices[item]
+   bought = ["banana", "banana", "cherries", "apple", "apple", "banana"]
+   for item in bought:
+   total = 0
+   prices = {
+      "apple": 0.50,
+      "banana": 1.00,
+      "orange": 1.50,
+      "cherries": 3.00,
+   }
+
+Exercise 4: Receipt assitant 2.0
+--------------------------------
+
+Improve the receipt assistant from the previous chapter
+so that it uses a dictionary of prices.
+
+
+Reflection Questions
+--------------------
+
+-  How can you create a dictionary?
+-  How can you modify values in a dictionary?
+-  Is it possible to run a for loop over a dictionary?

index.rst

@@ -37,7 +37,7 @@ First Steps
    first_steps/cypher.rst
    first_steps/bill.rst
    first_steps/slideshow.rst
-   data_structures/dictionaries.md
+   first_steps/dictionaries.md
 
 
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