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How does the python compiler work for you?

Python compiler


Python compiler execution

As you know, python is OOP(Object-oriented-Programming) and interpreted language.

That’s why it becomes slow.

To solve this, python compiler work is to convert its source code into byte-code.

First, it checks the source code. if there isn’t an error then it’s compiled in bytecode.

Second, it interpreted the byte code into machine code.

At last, the program interpreted and give output.

Before seeing the “how does the python compiler work?”. You’ve to see what’s the compiler?

What’s the python compiler?

A Python compiler is a computer program that converts high-level to low-level code.

For instance, converting high-level languages such as python into low-level assembly and machine language.

Compiler scans the source code.

For an analogy, you’ve written a letter in English and you’ve to send it to China.

But the people you’ve to send doesn’t know English.

So, first, you’ve to compile or translate letters into Chinese.

As a result, the Chinese person can understand it.

Whereas, Interpreter is a line by line execution of code.

As a result, interpreters execute single lines into machine language.

The compiler language such as C, C++ and java.

There are many python compilers. you can check it out here.

Does python uses compiler?

Python is a high and interpreted language.

As a result, it executes code line by line.

You’d say if python is interpreted language then what’s the work of the python compiler?

For clarity, you can say that python uses a compiler in the first step.

That means to execute the code it’ll use an interpreter. But to increase the performance it uses the compiler.

So, you’d say ok. but how does the python compiler work?

This question has been solved into two sections. See the below sections, you’ll found it.

Source code into Byte code

Source code is a computer program written by a programmer or user in the text editor.

After writing this program it was saved into the file. For example, is a source code file.

Likewise, byte code is an intermediate language for source code.

A virtual machine is an interpreter that executes code per line.

So, you’re going to see the process. Keep eye on it!!

First, the Python compiler takes the source code.

If the source code is smoothly written then it’ll go to the second step.

Otherwise, it’ll show you the error.

So, you’ll amaze where these errors are coming from?

I’ll give you an answer it’s your error.

That means you’ve written source code.

So, it’s possible you haven’t written correctly!

Next time if you’ll see the error. Then keep in mind that your code isn’t converted into byte code.

And if you have no error we can move to the next step i.e. Byte code to machine code

Byte-code into interpreter

You’ve moved from the first step that’s in byte-code.

The byte-code converts source code into Python virtual machine(PVM).

PVM is an interpreter that executes code line by line.

As a result, we use the term that Python is interpreted language.

But, if you see clearly it’s both compiler and interpreted language.

In contrast, if any error occurs then conversion is halted with an error message.

So, you’ll ask why so complicated process?

Why we can’t use the only python compiler.

Why so complicated proccess?

Most important, python uses both interpreter and compiler.

The reason behind it’s that python wants to be portable.

That means you don’t need to write different codes for every device.

As a result, you don’t need to change your code for compatibility.

So, you can say this complicated process is worthy of portability.


What’s the machine code in python?

Machine code is a code understand by a machine.

To clarify, the machine doesn’t understand the human language such as English, french and german.

So, for machine-understandable code, we’ve to convert it into machine code.

Machine code is a program of binary numbers.

That means computers or machines only understand 0s and 1s format.

So, python needs a compiler and interpreter to convert source code into machine code.

In python, the source code directly doesn’t convert into machine code.

First, the byte code is submitted to the python interpreter.

This interpreter converts byte code into machine code.

As a result, in python machine code executes line by line.

What’s the Python Virtual Machine(PVM)?

It’s a virtual machine in python which comes with installation.

As a result, the byte code doesn’t process through the CPU.

In contrast, the byte code is processed through the Virtual machine.

This virtual machine is called an Interpreter.

The interpreter interprets the program line by line.

Therefore, the machine code executes in each line.

What is the best python compiler?

To execute code fast and flexibly. you need a python compiler.

So, you need a python compiler that is good and flexible.

As a result, I’ve created the whole list of the best python compilers.

You can access this list free from here.

Interpreter vs compiler

The Interpreter is a computer program that interpreted code line by line.

As a result, it executes a single statement faster than the compiler.

However, the whole process is slower than the compiler.

In opposite, a Compiler is a program that scans the program.

so, its Overall speed is faster than the interpreter.

Likewise, the Compiler converts source code into machine code.

Whereas, the interpreter doesn’t convert every source code into a machine.

Also, the interpreter executes line by line. so error detection becomes easy because it’ll give error instantly and you can fix it.

Whereas, the compiler first scans the program then give an error.

So, it takes lots of time to detect errors.

As a result, debugging is hard in the compiler.

Python is interpreted. so, you can easily debug it.

Whereas, C, C++ and Java are compiled languages. As a result, debugging becomes harder in these languages.

What’s a CPython?

Python is a high and interpreted language.

As a result, it’s big and slow.

Whereas, C is a compiled language. so, it’s faster than python.

To solve the performance issue python started the CPython project.

CPython is an execution of python using C implementation.

Therefore, python became fast and flexible.

You can check the CPython announcement here.

Likewise, there is JPython that is the execution of python using java implementation.

So, In this blog, I’ve gone through the execution of the python compiler.

At last, what’s the important thing for the python compiler?

Is anything you want to comment on. You can comment now!!

I’ll happy for your comment.

To know more about python you can check out here.

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