python program execution process
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python, a high-level, interpreted programming language, is widely known for its simplicity and readability. unlike compiled languages like c or c++, python doesn't require you to manually compile your code before running it. however, understanding how python executes your code can help you write more efficient and optimized programs. in this tutorial, we'll explore the steps involved in the python program execution process.
when you write a python program, you're creating source code. this is the human-readable code that you type into a file with a .py extension. the source code contains instructions written in python's syntax.
once you run your python program, the first step is the compilation of the source code into bytecode. bytecode is an intermediate, lower-level representation of your source code that is still not machine code. it’s a set of instructions that can be executed by the python interpreter.
automatic compilation: python automatically compiles your source code into bytecode before executing it. this bytecode is stored in .pyc files in a _pycache_ directory, located in the same folder as your source code.
why bytecode?: the use of bytecode allows python to run the program faster in subsequent executions because it doesn’t need to recompile the code each time, provided that the source code hasn’t changed.
after the source code is compiled into bytecode, the python virtual machine (pvm) comes into play. the pvm is an interpreter that reads and executes the bytecode.
interpreting bytecode: the pvm interprets the bytecode line by line and converts it into machine code that your hardware can understand. this is where the actual execution of your program happens.
platform independence: since python code is executed by the pvm, it remains platform-independent. the same python code can run on different operating systems without modification, as long as a compatible python interpreter is available.
once the pvm executes the bytecode, your program's instructi ...
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