title: TypeError: argument of type 'int' is not iterable
body: <p>I am getting this error when I run my program and I have no idea why. The error is occurring on the line that says "if 1 not in c:"</p>
  
  <p>Code:</p>
  
  <pre><code>matrix = [
      [0, 0, 0, 5, 0, 0, 0, 0, 6],
      [8, 0, 0, 0, 4, 7, 5, 0, 3],
      [0, 5, 0, 0, 0, 3, 0, 0, 0],
      [0, 7, 0, 8, 0, 0, 0, 0, 9],
      [0, 0, 0, 0, 1, 0, 0, 0, 0],
      [9, 0, 0, 0, 0, 4, 0, 2, 0],
      [0, 0, 0, 9, 0, 0, 0, 1, 0],
      [7, 0, 8, 3, 2, 0, 0, 0, 5],
      [3, 0, 0, 0, 0, 8, 0, 0, 0],
      ]
  a = 1
  while a:
       try:
          for c, row in enumerate(matrix):
              if 0 in row:
                  print("Found 0 on row,", c, "index", row.index(0))
                  if 1 not in c:
                      print ("t")
      except ValueError:
           break
  </code></pre>
  
  <p>What I would like to know is how I can fix this error from happening an still have the program run correctly.</p>
  
  <p>Thanks in advance!</p>