What Is Python? Definition and Key Language Features

TL;DR

Python is an interpreted, general-purpose, high-level programming language with easy syntax and dynamic semantics. It uses an interpreter to translate human-readable code into machine code, works across domains like web development, robotics, and AI, and lets you assign values to variables without declaring their type.

Transcript

foreign we saw the introduction to Python Programming now we are ready to understand the definition of python so without any further delay let's get started and let's see all the topics of this presentation one by one there is only one topic we need to cover in this presentation and that is python definition now we will try to understand the defini... Read More

Key Insights

• Python is an interpreted, general-purpose (multi-purpose), high-level programming language with easy syntax and dynamic semantics. Understanding each of these words is the key to understanding the full definition of the language.
• Python was created by Guido van Rossum during the period of 1985 to 1990. He named it after the British comedy series Monty Python's Flying Circus, not after the snake, because he is a big fan of the show.
• An interpreted language uses an interpreter for translation, while a compiled language uses a compiler. Both compiler and interpreter are translators that convert code from one programming language into another.
• Translation is needed because humans understand languages like Python, C, C++, and Java, but computers cannot. A translator takes human-readable source code as input and generates machine code as output.
• Python is general-purpose because it is not specialized to a specific domain. It can be used across web development, robotics, artificial intelligence, mobile applications, and desktop applications rather than serving one special purpose.
• A high-level language is one humans can understand without problems, while a low-level language of zeros and ones is understood only by machines. Python code like 'area = length * breadth' is high-level and human-readable.
• Python has easy syntax because it removes overhead required in languages like C: no need to specify a variable's type, no semicolon after every statement, no placeholder in the print function, and 'print' is clearer than 'printf'.
• Python has dynamic semantics because variables are dynamic objects. Since you never specify a type, Python is dynamically typed, and a variable holding an integer can later hold a floating point value without any problem.

Questions & Answers

Q: What is the definition of Python?

Python is an interpreted, general-purpose or multi-purpose, high-level programming language with easy syntax and dynamic semantics. Understanding the definition requires understanding each word: interpreted means it uses an interpreter for translation, general-purpose means it is not tied to one domain, high-level means humans can understand it, easy syntax means minimal code overhead, and dynamic semantics means variables are dynamic objects that can hold any type of value.

Q: Who created Python and why is it called Python?

Python was created by Guido van Rossum during the period of 1985 to 1990. He named the language Python because he is a big fan of a British comedy series called Monty Python's Flying Circus, so the name comes from that series and not from a snake as many people assume when they first hear the language's name.

Q: What does it mean that Python is an interpreted language?

An interpreted programming language is one that uses an interpreter for its translation, as opposed to a compiled language which uses a compiler. Both compilers and interpreters are translators. Python being interpreted means it uses an interpreter as a translator to convert its human-readable source code into machine code that computers can actually understand and execute.

Q: Why does Python code need to be translated?

Languages like Python, C, C++, and Java need translation because humans can understand these languages well, but computers cannot. A translator acts like a device that takes source code, the code humans understand, as input, and generates machine code as output. Machine code is the code computers understand, so translation bridges the gap between human-readable code and machine-executable code.

Q: What makes Python a general-purpose programming language?

Python is general-purpose, or multi-purpose, because it is not specialized to a specific domain. Instead of serving one area, it can be used across multiple domains: web development to create web applications, robotics to create intelligence for robots, artificial intelligence applications, mobile applications, and desktop applications. This wide range of uses is why it is not called a special-purpose language.

Q: What is the difference between a high-level and low-level programming language?

A high-level programming language is one that humans can understand without any problem, such as Python code where you write 'length = 50', 'breadth = 20', 'area = length * breadth', and print the area. A low-level programming language is understood well only by machines, which work in the language of zeros and ones that humans are not capable of understanding.

Q: Why does Python have easy syntax compared to C?

Python has easy syntax because it removes overhead that languages like C require. In Python there is no need to specify the type of a variable, no need to add a semicolon after every statement, and no need to add a placeholder like %d in the print function. Additionally, the name 'print' is much clearer than C's 'printf', making Python code easier to read and understand.

Q: What are dynamic semantics in Python?

Dynamic semantics mean that variables are dynamic objects in Python. Because Python never requires you to specify a variable's type, it is dynamically typed. A variable currently holding an integer value is not limited to integers; later in the code you can assign a floating point value to that same variable, which is completely fine. In C, by contrast, static typing forces a variable to keep its declared type throughout the program.

Summary & Key Takeaways

• Python is defined as an interpreted, general-purpose (or multi-purpose), high-level programming language with easy syntax and dynamic semantics. It was created by Guido van Rossum between 1985 and 1990, and named after the comedy series Monty Python's Flying Circus rather than the snake.

• Being interpreted means Python uses an interpreter, rather than a compiler, to translate its code into machine code. Translation is required because humans understand languages like Python, C, C++, and Java, but computers cannot, so source code must be converted into machine-understandable code.

• Python is general-purpose because it works across many domains such as web, robotics, AI, mobile, and desktop apps. It is high-level and human-readable, has easy syntax with no type declarations or semicolons, and has dynamic semantics because variables are dynamic objects that can hold any type of value.