title: Python list remove append
body: <p>I have a file I am putting into a list and I am wanting to take some things out of it, and append to another list ( I have no problem with that), the problem I run into is removing the things out of the first list. below is what I have tried but it only removes every other from the original list.</p>
  
  <pre><code>list:
  bob     g1  3110
  bob     g2  244
  bob     g3  -433
  greg    fun112  10595
  greg    fun113  -1203
  greg    fun114  -3049.999
  greg    fun115  3808
  greg    fun116  320
  greg    got112  -600
  greg    got113  5958
  greg    got114  1249
  
  
  file1 = open('test','rb').read().splitlines()
  file1=sorted(file1)
  test_group = ['fun','got']
  test= []
  
  for product in file1:
      spt = product.split(",")
      for line in spt:
          if line[:3] in test_group:
              x = test.append(product)
              y = file1.remove(product)
  </code></pre>
  
  <p>the test [ ] list is fine all of the items I want in there go with no problem, but when I review file1 it only takes out every other one of 'fun' and 'got' lines</p>
  
  <p>why is this only taking out every other one, and how do I fix it?</p>