Skip to content
The Best Gourmet Chocolate Bar
  • AI Chat
  • Code
  • Report
  • ℹ️ Introduction to Data Science Notebooks

    You can skip this section if you are already familiar with data science notebooks.

    Data science notebooks

    A data science notebook is a document that contains text cells (what you're reading right now) and code cells. What is unique with a notebook is that it's interactive: You can change or add code cells, and then run a cell by selecting it and then clicking the Run button above ( , or Run All ) or hitting control + enter.

    The result will be displayed directly in the notebook.

    Try running the cell below:

    # Run this cell to see the result
    100 * 1.75 * 17

    Modify any of the numbers and rerun the cell.

    Data science notebooks & data analysis

    Notebooks are great for interactive data analysis. Let's create a pandas DataFrame using the read_csv() function.

    We will load the dataset "chocolate_bars.csv" containing different characteristics of over 2,500 chocolate bars and their reviews.

    By using the .head() method, we display the first five rows of data:

    # Importing the pandas module
    import pandas as pd
    # Reading in the data
    df = pd.read_csv('data/chocolate_bars.csv')
    # Take a look at the first datapoints

    Data analysis example:

    Find the average rating for chocolate bars with different numbers of ingredients.

    We can use .groupby() to group the information by the column "num_ingredients". Then we select the column "rating" and use .mean() to get the average rating for each group:


    Data science notebooks & visualizations

    Visualizations are very helpful to summarize data and gain insights. A well-crafted chart often conveys information much better than a table.

    It is very straightforward to include plots in a data science notebook. For example, let's take a look at the relationship between review year and rating.

    We are using the seaborn library for this example. We will run the scatterplot() function and include the variables we want to display.

    import matplotlib.pyplot as plt
    import seaborn as sns
    sns.scatterplot(x='year_reviewed', y='rating', data=df)

    We can also make a plot from the table we calculated above (average rating for chocolate bars with different numbers of ingredients):

    sns.barplot(x='num_ingredients', y='rating', data=df)

    The Best Gourmet Chocolate Bar

    Now let's now move on to the competition and challenge.

    📖 Background

    You work at a specialty foods import company that wants to expand into gourmet chocolate bars. Your boss needs your team to research this market to inform your initial approach to potential suppliers.

    After finding valuable chocolate bar ratings online, you need to explore if the chocolate bars with the highest ratings share any characteristics that could help you narrow your search for suppliers (e.g., cacao percentage, bean country of origin, etc.)

    💾 The data

    Your team created a file with the following information (source):
    • "id" - id number of the review
    • "manufacturer" - Name of the bar manufacturer
    • "company_location" - Location of the manufacturer
    • "year_reviewed" - From 2006 to 2021
    • "bean_origin" - Country of origin of the cacao beans
    • "bar_name" - Name of the chocolate bar
    • "cocoa_percent" - Cocoa content of the bar (%)
    • "num_ingredients" - Number of ingredients
    • "ingredients" - B (Beans), S (Sugar), S* (Sweetener other than sugar or beet sugar), C (Cocoa Butter), (V) Vanilla, (L) Lecithin, (Sa) Salt
    • "review" - Summary of most memorable characteristics of the chocolate bar
    • "rating" - 1.0-1.9 Unpleasant, 2.0-2.9 Disappointing, 3.0-3.49 Recommended, 3.5-3.9 Highly Recommended, 4.0-5.0 Oustanding

    Acknowledgments: Brady Brelinski, Manhattan Chocolate Society

    Inspecting the data

    Checking for null values and shape of data