I'd say a MOOC certificate in Python is unlikely to impress professional programmers. It may impress ordinary business persons. So in terms of hiring, it might be useful in terms of working for a business whose primary business is not programming. It probably won't directly eliminate a candidate from a job in a business whose primary business is programming.
However, there are not vast numbers of "employers of entry level developers" relative to the vast number of potential entry level developers. A job as an entry level developer is most likely to be found by job hunting not taking a MOOC. More importantly, taking a MOOC is a lot easier for many people than actively job hunting because active job hunts are hard, involve a lot of rejection and being ignored, and often take much longer than a MOOC. The key to getting an entry level Python job is to find someone who is hiring entry level Python developers.
However, there are not vast numbers of "employers of entry level developers" relative to the vast number of potential entry level developers. A job as an entry level developer is most likely to be found by job hunting not taking a MOOC. More importantly, taking a MOOC is a lot easier for many people than actively job hunting because active job hunts are hard, involve a lot of rejection and being ignored, and often take much longer than a MOOC. The key to getting an entry level Python job is to find someone who is hiring entry level Python developers.
Good luck.