> Is there really no situation in which an alternative implementation that only supports "pure Python" would be useful? This really depends on your definition

> Is there really no situation in which an alternative implementation that only supports "pure Python" would be useful? This really depends on your definition of 'being useful'. Jython is useful in a sense, it is being used in many Big Data solutions as a way to embed Python as DSL/UDF, like Pig/Hive, etc. However, if without support for C extensions, it is not really a Python implementation, in a sense, I can't run a python script I just gripped from internet using the so-called 'alternative' implementation. So if the point of being useful is to be a replacement, then sadly, the answer is no, it is an everything-or-nothing situation.