title: Python Read Certain Number of Bytes After Character
body: <p>I'm dealing with a character separated hex file, where each field has a particular start code. I've opened the file as 'rb', but I was wondering, after I get the index of the startcode using .find, how do I read a certain number of bytes from this position?
  This is how I am loading the file and what I am attempting to do</p>
  
  <pre><code>with open(someFile, 'rb') as fileData:
      startIndex = fileData.find('(G')
      data = fileData[startIndex:7]
  </code></pre>
  
  <p>where 7 is the number of bytes I want to read from the index returned by the find function. I am using python 2.7.3</p>