研究pyjamas的時候發現一下的文字：
Combining PyJS and PyV8 to produce an Optimising Python Compiler
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pyjs.py is a stand-alone python-to-javascript. PyV8 provides python
bindings to the V8 Javascript Execution library, which provides fast
JIT-compiled x86 and ARM assembler of a javascript application.
Combining the two back-to-back would logically provide a way to
compile python scripts to x86 or ARM assembler, resulting in a competitor
to Psyco with the added advantage of supporting ARM CPUs.
簡而言之，pyv8就是V8的Python綁定。