title: How do I vectorize a function in python or numpy?
body: <p>For instance, in Julia language, a function can easily be vectorized as shown</p>
  <pre><code>function circumference_of_circle(r)
      return 2*π * r
  end
  
  a = collect([i for i=1:200])
  circumference_of_circle.(a) # easy vactorization using just (.)
  </code></pre>
  <p>Although I like Julia very much, it has not matured like Python.</p>
  <p>Is there a similar vectorization technique in the Python function?</p>