Byte code represents a fixed set of instructions that represents all operations like arithmetic operations, comparison operations, memory related operations etc..
which run on any operating system and hardware. It means the byte instructions are system independent or platform independent. The size of each byte code instruction is 1 byte and hence they are called with the name byte code.
Lets consider below program for viewing its byte code
#Python program to add two numbers a = b = 10 #take two variables and store 10 in to them print("Sum=", (a+b)) #display their sum
We can type this program in a text editor like Notepad and then save it as 'first.py'. It means, the first.py file contains the source code
Now, let's compile the program using Python compiler as
It will display the result as: sum=20
Bytecode 'dis' module
We do not want the output of the program. We want to see the byte code instructions that were created internally by the Python compiler before they are executed by the PVM.
For this purpose, we should specify the 'dis' module while using python command as:
C:\>python -m dis first.py
It will produce the following output:
1 0 LOAD_CONST 0 (10) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 STORE_NAME 1 (b) 2 8 LOAD_NAME 2 (print) 10 LOAD_CONST 1 ('Sum =') 12 LOAD_NAME 0 (a) 14 LOAD_NAME 1 (b) 16 BINARY_ADD 18 CALL_FUNCTION 2 20 POP_TOP 22 LOAD_CONST 2 (None) 24 RETURN_VALUE