title: psycopg2 executemany with simple list?
body: <p>I'm trying to use psycopg2 executemany for a simple multi-insert but I can only make it work using dict and not "plain" sequence of values:</p>
  
  <pre><code># given:
  values = [1, 2, 3] ; cursor = conn.cursor()
  
  # this raises TypeError: 'int' object does not support indexing:
  cursor.executemany('INSERT INTO t (col_a) VALUES ( %s )', values)
  # I also tried encapsulating my 'values' into a tuple/list but it gives another exception (TypeError: not all arguments converted during string formatting).
  
  # while this is ok:
  cursor.executemany('INSERT INTO t (col_a) VALUES ( %(value)s )', [  dict(value=v) for v in values ])
  </code></pre>
  
  <p>isn't it possible to give a "simple" list/tuple of values without using "named" parameter (%(value)s) ?</p>