Gain insights into Python by exploring basic to advanced concepts, including loops, classes, and GUIs with Tkinter. Delve into testing and become a productive Python programmer.

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In this course, you will get a comprehensive overview of Python. You will start by laying the foundation and learning the introductory topics like operators, conditional statements, functions, loops, assignment statements, and more. You will then move onto more advanced topics such as classes and inheritance, iterators, list comprehensions, and dictionaries. Along with this, you will also get to explore the concept of testing and take a look at how GUI applications can be designed using Tkinter, Python's standard GUI library. 

By the time you're done, you'll be able to hit the ground running and be equipped with the tools that will allow you to be productive in Python.

Python 3: From Beginner to Advanced

def most_purchases(groceries):
    most_purchase_customer = None
    max_purchases_sum = 0
    
    for key in groceries:
        curr_sum = sum(groceries[key])

        if curr_sum > max_purchases_sum:
            max_purchases_sum = curr_sum
            most_purchase_customer = key

    return (most_purchase_customer, max_purchases_sum)

groceries = {
    "James": [10, 2, 5, 7, 9, 4, 6],
    "Tom": [1, 12, 3, 0, 1, 2, 5],
    "Sam": [9, 5, 4, 3, 2, 1, 3], 
}

customer_results = most_purchases(groceries)
print(customer_results)

## Explanation

The first thing we need to do is create two new variables: `most_purchase_customer` and `max_purchases_sum` at **lines 2 to 3** respectively. These will be used to store the name of the customer who made the most purchases in the entire week as well as their purchase count. 

Next, using a `for` loop, we will iterate over the `groceries` dictionary at **line 5** to access the dictionary's key. 

At **line 6**, we will take the sum of the list of values of `groceries` dictionary's current key, using the built-in `sum` function. (It's okay if you used a loop to do this.)  

After this, at **line 8**, we will check to see if the `max_purchases_sum` variable that we declared at the beginning has a value smaller than the current sum (`curr_sum`). If this case is true, we will assign the value of `curr_sum` to `max_purchases_sum` along with the value of the current `key` to the `most_purchase_customer` variable at **lines 9 to 10**. 

Finally, after the entire `groceries` dictionary has been traversed, we will return a tuple 
of `most_purchase_customer` and `max_purchases_sum` at **line 12**. 

# Explanation

The first thing we need to do is create two new variables: `most_purchase_customer` and `max_purchases_sum` at **lines 2 to 3** respectively. These will be used to store the name of the customer who made the most purchases in the entire week as well as their purchase count. 

Next, using a `for` loop, we will iterate over the `groceries` dictionary at **line 5** to access the dictionary's key. 

At **line 6**, we will take the sum of the list of values of `groceries` dictionary's current key, using the built-in `sum` function. (It's okay if you used a loop to do this.)  

After this, at **line 8**, we will check to see if the `max_purchases_sum` variable that we declared at the beginning has a value smaller than the current sum (`curr_sum`). If this case is true, we will assign the value of `curr_sum` to `max_purchases_sum` along with the value of the current `key` to the `most_purchase_customer` variable at **lines 9 to 10**. 

Finally, after the entire `groceries` dictionary has been traversed, we will return a tuple 
of `most_purchase_customer` and `max_purchases_sum` at **line 12**. 

This review explains the solution for the "most purchases'"problem.

Introduction

The Absolute Bare Minimum

Better Tools

Classes

Getting Fancy

Testing

Graphical User Interfaces

Modules

Appendix

I Guess We're Doing Python Now Exam

Solution Review: Finding the Customer With the Most Purchases

Solution

Explanation