title: What is Ruby equivalent of Python's `s= "hello, %s. Where is %s?" % ("John","Mary")`
body: <p>In Python, this idiom for string formatting is quite common</p>
  
  <pre><code>s = "hello, %s. Where is %s?" % ("John","Mary")
  </code></pre>
  
  <p>What is the equivalent in Ruby?</p>