Although Python excels in one-off, general-purpose tasks, its biggest drawback is speed. It doesn’t match Java in supporting real-time tasks or financial transactions where milliseconds matter.

Speed in the Core Python (CPython) is one of the reasons why other implementations have emerged, such as Pyston. ... JavaScript has most developers but Rust is the fastest growing.

Python also ranked highly in Stack Overflow's 2017 developer survey, which found it was the fifth most popular language behind JavaScript, SQL, Java, and C#. It was also the top language ...