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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

## Definition

A **dictionary** (of type `dict`) provides a fast way of looking something up. Dictionaries are often used when you want to create a mapping from keys to values without having to maintain their order. Additionally, if you want to access items instantly without having to traverse through the whole collection, dictionaries are the way to go. 

A dictionary consists of zero or more **_key:value_** pairs enclosed in braces, `{ }`. For example, you might define a “phone book” dictionary as follows:
```python
phones = {"Alice":5551212, "Jill":5556789, "Bob":5559999}
```

You can see this in the example below:

# Definition

A **dictionary** (of type `dict`) provides a fast way of looking something up. Dictionaries are often used when you want to create a mapping from keys to values without having to maintain their order. Additionally, if you want to access items instantly without having to traverse through the whole collection, dictionaries are the way to go. 

A dictionary consists of zero or more **_key:value_** pairs enclosed in braces, `{ }`. For example, you might define a “phone book” dictionary as follows:
```python
phones = {"Alice":5551212, "Jill":5556789, "Bob":5559999}
```

You can see this in the example below:

In this lesson, you'll learn about the dictionary object in Python.

Introduction

The Absolute Bare Minimum

Better Tools

Classes

Getting Fancy

Testing

Graphical User Interfaces

Modules

Appendix

I Guess We're Doing Python Now Exam

Dictionaries

Definition