This is a summary of Chapter 6 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

What is a Dictionary?

Dictionaries are used to store data values in key-value pairs. Each key is connected to a value, and you can use a key to access the value associated with that key. A key’s value can be a number, string, list, another dictionary, you can use any object that you created in Python as a value in a dictionary. It’s a collection that is unordered, mutable, and does not allow for duplicates. Dictionaries are written with curly braces and have…

This is a summary of Chapter 4 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

Slicing a List

To slice your list, state the index of the first and last elements you are targeting. Just like the range() function, the first value in the slice will be included but the second value will be excluded. For example:

names = ["michael", "dwight", "jim", "kevin", "andy"]
print(names[0:2])>>> ['michael', 'dwight']

As you can see when we slice the list, the first value is included while the second value is excluded. …

This is a summary of Chapter 5 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

What is an If Statement?

If statements allow decision making in code. They check the stated variable and give a designated response. Here is a basic example:

name = "jill"if name == "jill":
    print("Hey Jill")
elif name == "john":
    print("Hello John")
else:
    print("Wait a minute, who are you?")>>> Hey Jill

Here is another example:

for number in range(1, 101):
    if number == 7:
        print(str(number) + " is my favorite number!")
    elif number == 50:
        print(str(number) + " is half of 100!") …

This is a summary of Chapter 4 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

Tuples

Tuples are immutable lists. They look like lists except you use parentheses instead of square brackets. And, just like a list, you can access individual items using the index. For example:

names = ("frank", "john")
print(names[0])
print(names[1])>>> frank>>> john

Like we said earlier, tuples are immutable so let’s see what happens when we try to change anything:

names = ("frank", "john")
print(names[0])
print(names[1])names[0] = "will">>> frank>>> johnTraceback (most recent call last): File "main.py"…

This is a summary of Chapter 4 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

Using the range() Function

The range() function allows us to generate a series of numbers. For example:

for i in range(0, 3):
    print(i)>>> 0>>> 1>>> 2

As you can see from the above code, the code will print the numbers from 0 (inclusive) up until 3 (exclusive). This is the off-by-one behavior you will see a lot in many programming languages. …

This is a summary of Chapter 4 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

Looping through a List

Imagine retrieving individual items in a list. If we were to use the print() function, depending on the number of items in the list, it could take forever. We would also have to change our code every time the list’s length changed. For example:

friends = ["kyle", "paul", "chris"]
print(friends[0])
print(friends[1])
print(friends[2])>>> kyle>>> paul>>> chris

The for loop avoids those issues by allowing Python to manage those changes internally. The for loop looks like this:

friends…

This is a summary of Chapter 3 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

What is a List?

A list is a collection of items placed in any order. Lists can be made with all valid data types such as letters, numbers, strings, etc. The items within the list do not need to have any relation, although most tend to create lists based on items that are related to one another. Because lists usually contain more than one item, it’s a good idea to make the name of your list plural, such as numbers, letters, characters, etc.

…

This is a summary of Chapter 2 of “Python Crash Course: A Hands-On, Project Based Introduction to Programming” by Eric Matthes

Strings

In Python, a string is a series of characters inside quotes. You can use single or double quotes around your strings like this:

double_quotes = "This is a string with double quotes."
single_quotes = 'This is a string with single quotes.'print(double_quotes)
print(single_quotes)>>> This is a string with double quotes.>>> This is a string with single quotes.

The flexibility to use single or double quotes allows us to use quotes and apostrophes within strings:

as_quote = 'And…