title: Unicode case conversion
body: <p>I am given either a single character or a string, and am using Python.</p>
  
  <p>How do I find out if a specific character has a lowercase equivalent according to the standards (standard and special case mappings) proposed by Unicode?</p>
  
  <p>And how do I find out if a string has one or more characters that have a lowercase equivalent according to the standards (standard and special case mappings) proposed by Unicode?</p>