什么样的事情可以用Java而不是Python？

相反,Python具有PyPy编译器,这是非常酷的 – 具有多个备份的虚拟机(Java Runtime,LLVM,.net和Python IIRC),多个垃圾收集器,多个实现(Stackless)等.我知道Java具有虚拟机的大选择,但PyPy的增长是惊人的,因为它是用RPython编写的 – 这是一个相当有成效的语言.

此外,Java可以做到这一点,在1个文件中,少于20行,没有库导入？显然,这两种语言都有图书馆可以做到这一点,但我只是在谈论语言的灵活性.

class Logger(object): # boilerplate code
    def log(self,level,msg,*args,**kwargs): # *args,**kwargs = flexible arguments
        self._log(level,**kwargs) # call with flexible argments

    def _log(self,**kwargs):
        # override me at runtime :) 
        # I think Java people call this Dependency Runtime Injection
        if level>1:
            print msg,args,kwargs

logger = Logger() # boilerplate code

def logged(level): # what pattern do you call this?
    def logged_decorator(function): # and this? 
        def func(*args,**kwars): 
            name = func.__name__ # look ma,reflective metaprogramming!
            logger.log(level,name,**kwargs)
            return func(*args,**kwargs)
        return func # boilerplate code
    return logged_decorator # boilerplate code

使用示例

@logged
def my_func(arg1,arg2):
   # your code here
   pass