title: reading a csv into a hash
body: <p>Hello I am a lua beginner and am trying to loop through a CSV one line at a time. I would like to store each line read from the CSV in a hash table. The current state of the experimental code is as follows:-</p>
  
  <pre>
  local fp = assert(io.open ("fields.csv"))
  local line=fp:read()
  local headers=ParseCSVLine(line,",") 
  -- for i,v in ipairs(headers) do print(i,v) end    -- this print outs the CSV header nicely
  
  
  -- now read the next line from the file and store in a hash
  local line=fp:read()
  local cols=ParseCSVLine(line,",")
  local myfields={}
  for i,v in ipairs(headers) do
     -- print( v,cols[i])                            -- this print out the contents nicely
     myfields[v]=cols[i]                             ------ this is where things go bad -----
     end
  for i,v in ipairs(myfields) do print(i,v) end      ------ this print nothing!
  </pre>
  
  <p>The ParseCSVLine is from the <a href="http://lua-users.org/wiki/LuaCsv" rel="nofollow">http://lua-users.org/wiki/LuaCsv</a>. However the issue is the assignment to myfields[v]. Looking at the various docs the syntax of what is allowed within the [] is rather odd and it appears Lua does not allow the use of a symbol here. How do construct my new table in myfields?</p>