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Jan 5, 2021
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parse tree > Abstract Syntax Tree (AST) #257

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4 changes: 2 additions & 2 deletions software/micropython.md
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Expand Up @@ -85,9 +85,9 @@ This is, in fact, what you're doing when you live-code using the REPL. However,

MicroPython uses a combination of compilation and interpretation techniques to run your program. Here's how:

When MicroPython sees a script it parses each line of the script. The end result is a set of in-memory tokens grouped in such a way that they represent how your program works. This is called the *parse tree*.
When MicroPython sees a script it parses each line of the script. The end result is a set of in-memory tokens grouped in such a way that they represent how your program works. This is called the *Abstract Syntax Tree (AST)*.

The parse tree is compiled into a terse set of instructions called Python *bytecode*. Bytecode instructions are like CPU assembly language instructions, but they are targeted for a *virtual machine*, not for a real piece of computer hardware.
The AST is compiled into a terse set of instructions called Python *bytecode*. Bytecode instructions are like CPU assembly language instructions, but they are targeted for a *virtual machine*, not for a real piece of computer hardware.

The Python bytecode is given to the Python virtual machine to run and so your program is executed.

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