Loop through nested Python 3.7 dictionaries and format output with f-strings.

Python_3.7_nested_dictionaries_f-strings

# Create a generic products dictionary to contain multiple product dictionaries.
products = {
    'RB00111': {'name': 'Rayban Sunglasses', 'price': 112.98, 'models': ['black', 'tortoise']},
    'DWC0317': {'name': 'Drone with Camera', 'price': 72.95, 'models': ['white', 'black']},
    'MTS0540': {'name': 'T-Shirt', 'price': 2.95, 'models': ['small', 'medium', 'large']},
    'ECD2989': {'name': 'Echo Dot', 'price': 29.99, 'models': []}
}
# This header shows above the output. 
print(f"{'ID':<6} {' Name':<17} {'Price':>8}  {' Models'}")
print('-' * 60) # Prints 60 hyphens.
# Loop through each dictionary in the products dictionary
for oneproduct in products.keys():
    # Get the id of one product.
    id = oneproduct
    # Get the name of one product.
    name = products[oneproduct]['name']
    # Get the unit price of one product and format with $
    unit_price = '$' + f"{products[oneproduct]['price']:,.2f}"
    # Create and empty string variable named models
    models = ''
    # Loop through the models list and tack onto models
    # one item from the list followed by a comma and a space.
    for m in products[oneproduct]['models']:
        models += m + ', '
    # If the models variable is more than two characters in length,
    # Peel off the last two characters (last comma and space).
    if len(models) > 2:
        models = models[:-2]
    else:
        # Otherwise, if no models, show <none>.
        models = "<none>"
    # Print all the variables with a neat f-string.
    print(f"{id:<6} {name:<17} {unit_price:>8} {models}")
# Any unidented code down here executed after the loop completes.