Language founders Guido van Rossum, author of the Python programming language has contributed to BSD Unix as far back as 1986, he spent 7 years at Google building their Google Cloud offering and is now at Dropbox..That is a fantastic CV..Rasmus Lerdorf, the creator of PHP, worked at Yahoo from 2002 till 2009, a company that has a hard time outshining Google when it comes to technical innovation..I cant find any of his achievements at Yahoo during that time but I know they dont have a PaaS service thats competitive with Google App Engine..One of Lerdorfs famous quotes is "I dont know how to stop it, there was never any intent to write a programming language […] I have absolutely no idea how to write a programming language, I just kept adding the next logical step on the way." Fellow founders Andi Gutmans and Zeev Suraski have almost nothing of interest in their careers mentioned on their respective wikipedia pages beyond living it large off of PHP..The latests versions Ill admit that updating a programming language and pulling its respective community into the latest version is difficult to accomplish..Pythons biggest problem with Python 3 is that Python 2.7 does most jobs so well that the community has been slow to move to Python 3..PHP 6, which had been worked on from 2005 till 2010 has been abandoned and will never see the light of day..Code quality In August 2013, Coverity, a software quality and security testing company, analysed CPython and stated "Python has achieved a defect density of .005 (or .005 defects per 1,000 lines of code) and has eliminated all high-risk defects in its codebase."..Of the 996 defects they uncovered, 860 were fixed by the Python community at the time of the press release..To compare, in 2011, only 70% of the PHP 5.3 code base had unit tests..Unit tests prove youre code might be broken, no tests ensure your code is broken.. More details