title: Python index error value not in list...on .index(value)
body: <p>I am a beginner at Python, and to those who holds negative thoughts against my post, please leave. I am simply seeking help here and trying to learn. I'm trying to check within a simple data set the 0s and 1s. This will be used towards defining voids and solids on floor plans to define zones in buildings... eventually 0s and 1s will be swapped out with coordinates.</p>
  
  <p>I am getting this error: ValueError: [0, 3] is not in list</p>
  
  <p>I am simply checking if one list is contained in the other.</p>
  
  <pre><code>currentPosition's value is  [0, 3]
  subset, [[0, 3], [0, 4], [0, 5], [1, 3], [1, 4], [1, 5], [2, 1], [3, 1], [3, 4], [3, 5], [3, 6], [3, 7]]
  </code></pre>
  
  <p>Here's the code snippet:</p>
  
  <pre><code>def addRelationship(locale, subset):
      subset = []; subSetCount = 0
      for rowCount in range(0, len(locale)):
          for columnCount in range (0, int(len(locale[rowCount])-1)):
              height = len(locale)
              width = int(len(locale[rowCount]))
              currentPosition = [rowCount, columnCount]
              currentVal = locale[rowCount][columnCount]
              print "Current position is:" , currentPosition, "=", currentVal
  
              if (currentVal==0 and subset.index(currentPosition)):
                  subset.append([rowCount,columnCount])
                  posToCheck = [rowCount, columnCount]
                  print "*********************************************Val 0 detected, sending coordinate to check : ", posToCheck
  
                  newPosForward = checkForward(posToCheck)
                  newPosBackward = checkBackward(posToCheck)
                  newPosUp = checkUpRow(posToCheck)
                  newPosDown = checkDwnRow(posToCheck)
  </code></pre>
  
  <p>I am using subset.index(currentPosition) to check and see if [0,3] is in subset but getting the [0,3] is not in list. How come?</p>