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

## Commenting

Comments are one of the most important parts of your code because they give you an idea of what exactly your code is supposed to do. 

In Python, single line comments begin with a **hash mark**, `#`, and continue to the end of the line. 

# This is a Comment

# This is an Another Comment

# print("Hello, World!")

Although there isn't any specific syntax for multi-line comments in Python, you can either insert a hash mark for each comment line or use **triple-quoted strings** (`'''`).

# This is a multiline comment.

# print("Hello World")

'''
This is a multiline comment.

print("Hello World")
'''

## Order of execution

Not everything in a Python program has to be within a function. You can (and usually will) have some “_top-level_” statements. Very short programs may consist entirely of top-level statements with no function definitions.

Python programs are evaluated from beginning (first line) to end (last line). Top level-statements are evaluated as they occur. Evaluating a function definition (`def`) causes the function to be defined, but it won't be executed until some other statement calls it.

Functions are defined dynamically, meaning when a `def` is evaluated. As in most languages, there are no restrictions on the lexical ordering of functions (which ones appear first in a listing), but functions must be defined before they are called.

It is common for a program to consist of a collection of functions, with the last line of the program being a single top-level call to a “main” function. Often, this main function is named `main`, but not always.

# Commenting

Comments are one of the most important parts of your code because they give you an idea of what exactly your code is supposed to do. 

In Python, single line comments begin with a **hash mark**, `#`, and continue to the end of the line. 

# Order of execution

Not everything in a Python program has to be within a function. You can (and usually will) have some “_top-level_” statements. Very short programs may consist entirely of top-level statements with no function definitions.

Python programs are evaluated from beginning (first line) to end (last line). Top level-statements are evaluated as they occur. Evaluating a function definition (`def`) causes the function to be defined, but it won't be executed until some other statement calls it.

Functions are defined dynamically, meaning when a `def` is evaluated. As in most languages, there are no restrictions on the lexical ordering of functions (which ones appear first in a listing), but functions must be defined before they are called.

It is common for a program to consist of a collection of functions, with the last line of the program being a single top-level call to a “main” function. Often, this main function is named `main`, but not always.

Let's look at some guidelines and tips for creating good Python code. 

Python Coding Style Guide and Conventions

Let's look at some guidelines and tips for creating good Python code.

Introduction

The Absolute Bare Minimum

Better Tools

Classes

Getting Fancy

Testing

Graphical User Interfaces

Modules

Appendix

I Guess We're Doing Python Now Exam

Python Coding Style Guide and Conventions

Commenting

Order of execution