title: Python3 comparison operator, letter match a letter
body: <p>Ok so basically this is what I know, and it does work, using Python3:</p>
  
  <pre><code>color="Red1 and Blue2!"
  color[2]=="d"
  True
  </code></pre>
  
  <p>What I need is that when I call any position, (which inputs any single character Lower or Upper case in the comparison), into the brackets "color[ ]" and compare it to match only with "Lower or Upper case letters" excluding all numbers and characters (.*&amp;^%$#@!). 
  in order words something to the effects below:</p>
  
  <pre><code>color="Red1 and Blue2!"
  if color[5]==[a-zA-z]:
       doSomething
  else:
       doSomethingElse
  </code></pre>
  
  <p>Of course what I just listed above does not work. Perhaps my syntax is wrong, perhaps it just cant be done.   If I only use a single letter on the "right" side of the equals, then all is well, But like I said I need whatever single letter is pulled into the left side, to match something on the right.</p>
  
  <p>First off I wan't to make sure that its possible to do, what I'm trying to accomplish? 
  2nd, if it is indeed possible to do then have this accomplished "Without" importing anything other then "sys". </p>
  
  <p>If the only way to accomplish this is by importing something else, then I will take a look at that suggestion, however I prefer not to import anything if at all possible. </p>
  
  <p>I'v searched my books, and a whole other questions on this site and I can't seem to find anything that matches, thanks.</p>