Does it matter which language you use?

Yes, but don't expect miracles. Some people seem to believe that a programming language can or at least should solve most of their problems with system building. They are condemned to search forever for the perfect programming language and become repeatedly disappointed. Others dismiss programming languages as unimportant "implementation details" and put their money into development processes and design methods. They are condemned to program in COBOL, C, and proprietary design languages forever. A good language - such as C++ - can do a lot for a designer and a programmer, as long as its strengths and limitations are clearly understood and respected.

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I like python because it makes a lot of things easy and has libraries that make more things easy.  I do not like that it is a few hundred times slower than LuaJIT or C or C++ and uses a few tens of times more memory.  I do not like that it lacks anonymous functions (no, "lambdas with one expression" are not "anonymous function" until functional code written in Python compiles to the same thing as imperative code written in Python) and coroutines (but you can fix this by installing greenlet).