On 10/11/2016 4:02 AM, Pierre-Alain Dorange wrote:
Using this function, the code is "compiled".
I do not think this function is often used and most python project
simply use the interpreter (which do a small translation into byte-code
to be faster and check syntax error before running interpretation
You seem to be confusing CPython with, for instance, simple BASIC
interpreters that tokenized the code, translated keywords to function
numbers, and did other 'small translations' before execution.
The CPython compiler lexes (tokenizes), ll(1) parses to a syntax tree,
does some analysis and transformation of the tree, and translates it to
the bytecode for an stack machine. All done using standard compiler theory.
One can even ask compile() to stop with the syntax tree and return that
instead of a code object. One can then do one's own tree manipulation
and even code generation.
So yes there is a way to check "syntax error" before executing code
(using compile function and exceptions) but it was not standard,
> nor widely used...
In CPython, the built-in Python-visible compile function *is* the
CPython compile function used to compile *all* python code. Leaving out
interaction with the OS and initialization, one could loosely define
CPython as exec(compile(open('x.py').read())).
--
Terry Jan Reedy
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