title: concatenating variables into one large variable with python
body: <p>I have the below program in python which is supposed to print values from an array.</p>
  
  <pre><code>import sys
  from datetime import *
  import pprint
  txtfile=sys.argv[1]
  f = open(txtfile,'r')
  lines=f.readlines()
  f.close
  
  for line in lines:
      col = line.split(',')
      wrow=[]
      grid=[]
  
      lon=int(round(float(col[0]),0))
      lat=int(round(float(col[1]),0))
      val=float(col[2])
      my_tuple=(lon,lat,val)
      wrow.append(my_tuple)
  
      if(len(wrow)==720):
          row = wrow[0:] + wrow[:720]
          grid.append(row)
          wrow=[]
          row=[]
  
      if(len(grid)==360):
            grid.reverse()
           for row in grid:
              string=''
              i=1
              for mytuple in row:
                   print "count is ",i
                   val=str(mytuple[2])
                   print "val is ",val
                   #string = string + val + '\t'
                   #print "string is ",string
                   i=i+1
                   if(i==4):
                       print "****************************"
                       string = string + val + '\t'
                       #print string
                       #string = string + '\n'
                       i=1
                   else:
                       string = string + '\n'
                       #print string
            #pprint.pprint(grid)
            grid=[]
            wrow=[]
  
  
  
  exit()
  </code></pre>
  
  <p>The output of this program looks something like this:</p>
  
  <pre><code>****************************
  count is  1
  val is  0.51
  count is  2
  val is  0.69
  count is  3
  val is  0.83
  ****************************
  count is  1
  val is  0.7
  count is  2
  val is 0.59
  count is 3 
  val is 0.93
  *****************************
  </code></pre>
  
  <p>Now I want to set up the python script in such a way that I have a variable string that concatenates all the variables val.  Therefore is I have:</p>
  
  <pre><code>print "***************************"
  print string
  </code></pre>
  
  <p>I would get the output:</p>
  
  <pre><code>*******************************
  0.51 0.69 0.83
  *******************************
  0.7 0.59 0.93
  </code></pre>
  
  <p>Any ideas on how to tweak this script to do this?</p>