Menu
I want to hack around with the Python interpreter and try creating a small DSL . Is there any module where I can do something like this theoretical code (similar to LINQ expression trees)?
expression_tree = Function(
Print(
String('Hello world!')
)
)
compile_to_bytecode(expression_tree)
Or would it just be easier to just generate Python source code? Could this be made easier by using C or SWIG or Cython?
879
Byte Code is automatically created in the same directory as . py file, when a module of python is imported for the first time, or when the source is more recent than the current compiled file. Next time, when the program is run, python interpretator use this file to skip the compilation step.
The bytecode is a low-level platform-independent representation of your source code, however, it is not the binary machine code and cannot be run by the target machine directly. In fact, it is a set of instructions for a virtual machine which is called the Python Virtual Machine (PVM).
py: The input source code that you've written. . pyc: The compiled bytecode.
It's compiled to bytecode which can be used much, much, much faster. The reason some files aren't compiled is that the main script, which you invoke with python main.py is recompiled every time you run the script. All imported scripts will be compiled and stored on the disk.
Working via ast and compiling the tree into bytecode, as another answer suggests, is probably simplest; generating sources and compiling those, almost as good.
However, to explore lower-level approaches, check out the links from this page; I've found byteplay especially useful (currently doesn't work on 2.6 nor 3.*, only 2.4 or 2.5, but I think fixing it for 2.6 should be easy, as currently discussed in its tracker). I have not used Phil Eby's similarly-featured BytecodeAssembler, but given the author's reputation I'm sure it's worth checking it out!
98
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
