Python is a high-level, interpreted programming language that has taken the programming world by storm due to its readability and straightforward syntax. It was created by Guido van Rossum and first released in 1991. Python is designed to be highly readable, using English keywords frequently, whereas other languages use punctuation.

Python is a versatile language that supports multiple programming paradigms, including procedural, object-oriented, and functional programming. It's widely used for processing text, data analysis, artificial intelligence, and web development. Moreover, it's the backbone of many popular websites like Google, YouTube, Instagram, and Spotify. This language is also a key skill preferred by data scientists to create and deploy machine learning models and conduct complex data analysis tasks.

Companies seeking Python developers typically look for experience with:

1. Core Python concepts and principles.

2. Knowledge of Python libraries like NumPy, pandas, and Matplotlib.

3. Familiarity with web frameworks such as Django, Flask, or Pyramid.

4. Proficiency in integrating databases with Python.

5. Capacity to write reusable and tested code following coding standards.

6. Expertise in error handling and troubleshooting.

7. Experience in writing Python scripts for automating tasks.

8. Familiarity with Python's interaction with Front-End technologies like HTML, CSS, and JavaScript.

Moreover, problem-solving skills, analytical thinking, attention to detail, and good project management are also typically desired within these roles.

Building a foundation for mastering Python can start with developing a theoretical and practical understanding of fundamental programming concepts, such as variables, loops, functions, and data structures. Experience with other programming languages such as Java, C, or Ruby can also provide a solid base for learning Python. Furthermore, knowledge of mathematics and algorithms, especially for careers in data science, can be beneficial. Other related skills include understanding of databases and SQL, familiarity with development environments and version control (like Git), and basic knowledge of web technologies.

In conclusion, Python is an essential tech skill that is highly sought after due to its wide range of applications from web and software development to data analysis and machine learning. With its ease of understanding and flexibility, it is an excellent language for both beginners and experienced coders aiming to widen their tech skill set.