1 A bit of history about computer programing
- 1.1 Contents
- 1.2 Assembling (1947)
- 1.3 Compiling (1951)
- 1.4 Compiling Java code (for the Java virtual machine) (1991)
- 1.5 Running Python code in the Python virtual machine (1989)
- 1.6 PVM (Python Virtual Machine) implementations

A bit of history about computer programing

Assembling.
Compiling for the physical CPU.
Compiling for the Java virtual machine.
Compiling for the Python virtual machine.
Python Virtual Machines.

Assembling (1947)



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!cat hello.c



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!gcc -S hello.c



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!cat hello.s



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!gcc hello.s -o hello



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!file hello



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!./hello



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!wc -c < hello

Compiling (1951)



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!gcc hello.c -o hello



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!file hello



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!wc -c < hello

Compiling Java code (for the Java virtual machine) (1991)



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!cat HelloWorld.java



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!javac HelloWorld.java



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!javap -c HelloWorld.class



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!java HelloWorld

Running Python code in the Python virtual machine (1989)



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!cat hello_world.py



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!python hello_world.py



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!python -m dis hello_world.py

PVM (Python Virtual Machine) implementations

There are several Python bytecode compilers and PVMs. The most comprehensive is CPython (C refers to the interpreter is written in the C programming language). Other implementations are Jython (written in Java), PyPy (written in RPython, a restricted subset of Python that incorporates Psyco, a JIT compiler) and IronPython (written in C#).

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