title: xlrd python library
body: <pre><code>import xlrd
  wb = xlrd.open_workbook("file.xls")
  
  wb.sheet_names()
  
  sh = wb.sheet_by_index(0)
  
  for item in sh.col(0):
      value = unicode(item.value)
      if value.startswith("cheap"):
          print value
  </code></pre>
  
  <p>when i trying this code, interpritator return me:
  AttributeError: 'module' object has no attribute 'open_workbook'
  whats wrong? in all manuals typeed this code!</p>