TypeError:'int'对象不可迭代 - Python

Question

我收到以下错误:

  File "/home/ec2-user/test/test_stats.py", line 43, in get_test_ids_for_id
    cursor.execute("""select test_id from test_logs where id = %s """, (id))
  File "/home/ec2-user/.etl/lib/python2.7/site-packages/MySQLdb/cursors.py", line 187, in execute
    query = query % tuple([db.literal(item) for item in args])
TypeError: 'int' object is not iterable

这是我的代码部分,我遇到了麻烦:

def get_test_ids_for_id(prod_mysql_conn, id):
    cursor = prod_mysql_conn.cursor()
    cursor.execute("""select test_id from test_logs where id = %s """, (id))
    rows = cursor.fetchall()
    test_ids = []
    for row in rows:
      test_ids.append(row[0])
    return test_ids

Answer 1

你需要给cursor.execute一个元组,但你只给它一个整数:

(id)

添加逗号以使其成为元组:

(id,)

然后整条线是:

cursor.execute("""select test_id from test_logs where id = %s """, (id,))

将表达式放在括号中只是'组'表示一个表达式.这是一个逗号,使得某些元组成为元组:

>>> (42)
42
>>> (42,)
(42,)

任何迭代都会真的,所以你也可以使用[...]括号:

cursor.execute("""select test_id from test_logs where id = %s """, [id])