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

## Introduction to OS commands

Python also provides you with a module that has operating system commands. Here are some of the functions available when you `import os`:

* Use `os.getcwd()` to get the current working directory.

* Use `os.chdir(`_`path`_`)` to change the current working directory to _`path`_.
* Use `os.listdir(path=".")` to return a list containing the names of the entries in the directory `"."`.
    * Note that `path` (not italicized) in the `listdir` method is a keyword, not a variable that can be replaced by some other name. In all the other functions, _`path`_ (italicized) represents a variable containing a string or the string itself.
* Use `os.mkdir(`_`path`_, `mode=0o777, dir_fd=None)` to create a directory named _`path`_ with numeric `mode 0o777`. Here, the `dir_fd` is an optional parameter that is used as a unique identifier referring to a directory with `None` as the default value.
    > The `mode` is a Unix-style three-digit octal code. The three bits of each digit specify read, write, and execute permissions for owner, group, and world.
* Use `os.remove(`_`path`_, `dir_fd=None)` to delete the single file _`path`_. This is not for directories.
* Use `os.rmdir(`_`path`_, `dir_fd=None)` to remove (delete) the empty directory _`path`_.
* Use `os.rename(src, dst)` to rename the file or `src` directory to `dst`.
* Use `os.walk(top, topdown=True, onerror=None, followlinks=False)` to generate the file names in a directory tree by walking the tree either top-down or bottom-up. For each directory in the tree rooted at the top directory (including `top` itself), it yields a 3-tuple (`dirpath`, `dirnames`, `filenames`).

Here’s an example of this :

# Introduction to OS commands

Python also provides you with a module that has operating system commands. Here are some of the functions available when you `import os`:

* Use `os.getcwd()` to get the current working directory.

* Use `os.chdir(`_`path`_`)` to change the current working directory to _`path`_.
* Use `os.listdir(path=".")` to return a list containing the names of the entries in the directory `"."`.
    * Note that `path` (not italicized) in the `listdir` method is a keyword, not a variable that can be replaced by some other name. In all the other functions, _`path`_ (italicized) represents a variable containing a string or the string itself.
* Use `os.mkdir(`_`path`_, `mode=0o777, dir_fd=None)` to create a directory named _`path`_ with numeric `mode 0o777`. Here, the `dir_fd` is an optional parameter that is used as a unique identifier referring to a directory with `None` as the default value.
    > The `mode` is a Unix-style three-digit octal code. The three bits of each digit specify read, write, and execute permissions for owner, group, and world.
* Use `os.remove(`_`path`_, `dir_fd=None)` to delete the single file _`path`_. This is not for directories.
* Use `os.rmdir(`_`path`_, `dir_fd=None)` to remove (delete) the empty directory _`path`_.
* Use `os.rename(src, dst)` to rename the file or `src` directory to `dst`.
* Use `os.walk(top, topdown=True, onerror=None, followlinks=False)` to generate the file names in a directory tree by walking the tree either top-down or bottom-up. For each directory in the tree rooted at the top directory (including `top` itself), it yields a 3-tuple (`dirpath`, `dirnames`, `filenames`).

Here’s an example of this :

Learn about the different functions present in the operating system module. 

Introduction

The Absolute Bare Minimum

Better Tools

Classes

Getting Fancy

Testing

Graphical User Interfaces

Modules

Appendix

I Guess We're Doing Python Now Exam

Operating System Commands

Introduction to OS commands