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Python有几个不同的实现:CPython,Jython,PyPy等.我想以编程方式确定运行我的代码的实现.我怎样才能做到这一点？

具体来说,写一个get_implementation_name()为我调用的函数:

impl_name = get_implementation_name()
if impl_name == "CPython":
  print "I can abuse CPython implementation details. (I'm a bad, bad man.)"
elif impl_name == "PyPy":
  print "Can't count on reference-counting garbage collection here..."
else:
  print "I better be careful..."

我想将字符串的单个字符转换为整数,向其中添加2,然后将其转换回字符串.因此,A变为C,K变为M等.