title: Python: skip all lines without a letter/number
body: <p>I couldn't find this asked anywhere, I'm kind of surprised. I'm trying to read in a huge file line-by-line using this:</p>
  
  <pre><code>with open("file.csv") as f:
      for line in f:
          splitline = line.split()
  </code></pre>
  
  <p>If I <code>print(splitline)</code>, I get many many lines with just commas, that I don't want:</p>
  
  <pre><code>[',,,,,,,']
  </code></pre>
  
  <p>Lines I do want look like:</p>
  
  <pre><code>['XZ02345,AAA,BBB,1.0,11.0,15.0,1.0,1.0']
  </code></pre>
  
  <p>I have tried all kinds of <code>if 'XZ' in splitline: print(splitline)</code> and <code>if splitline[0] == "": continue</code> type solutions, but anything I try either prints all lines or none. </p>
  
  <p>Desired output is no lines that are just commas <code>[',,,,,,,']</code></p>