title: Why do we only talk about virtual environment in python?
body: <p>Why don't we talk about virtual environment in other programming language? Is there any equivalence for language like java, c++, javascript?</p>
  
  <p>Is the concept in other language as important as in python? 
  And I notice that the virtualenv was released initially in 2007. What did people use before that time? Or even before 2000?</p>