use dict(zip()) directly

Author: Matt Roeschke

pandas/io/sql.py

@@ -591,7 +591,7 @@ def _execute_insert(self, conn, keys, data_iter):
  data_iter : generator of list
  Each item contains a list of values to be inserted
  """
- data = [{k: v for k, v in zip(keys, row)} for row in data_iter]
+ data = [dict(zip(keys, row)) for row in data_iter]
  conn.execute(self.table.insert(), data)
 
  def _execute_insert_multi(self, conn, keys, data_iter):
@@ -601,7 +601,7 @@ def _execute_insert_multi(self, conn, keys, data_iter):
  and tables containing a few columns
  but performance degrades quickly with increase of columns.
  """
- data = [{k: v for k, v in zip(keys, row)} for row in data_iter]
+ data = [dict(zip(keys, row)) for row in data_iter]
  conn.execute(self.table.insert(data))
 
  def insert_data(self):

pandas/tests/io/test_sql.py

@@ -443,7 +443,7 @@ def _to_sql_method_callable(self):
 
  def sample(pd_table, conn, keys, data_iter):
  check.append(1)
- data = [{k: v for k, v in zip(keys, row)} for row in data_iter]
+ data = [dict(zip(keys, row)) for row in data_iter]
  conn.execute(pd_table.table.insert(), data)
  self.drop_table('test_frame1')