python：无法连接'str'和'tuple'对象[关闭]

Question

我想从员工表中获取池号并将池号用作查询 1 的参数。我得到错误 python: cannot concatenate 'str' and 'tuple' objects。

import MySQLdb
import sys

factor_mm=sys.argv[1]
factor_yy=sys.argv[2]

con_pd1 = MySQLdb.connect('localhost', 'abc', '12345', 'test')

cursor_pd1=con_pd1.cursor()

query="select pool_number from employee where current_mm="+factor_mm+" and current_yy="+factor_yy+" ;"
cursor_pd1.execute(query)
pools=cursor_pd1.fetchall()
pool_list=[]
for pool in pools:
 pool_list.append(pool[0])

for pool in pool_list:
 pool_number=pool
 try:
    query1="select * from fnma_mbs where pool_number='"+pool_number+"' and current_mm="+factor_mm+" and current_yy="+factor_yy+" ;"
    cursor_pd1.execute(query1)
    cursor_seqdb1.execute(query1)

    numrows_pd1=cursor_pd1.rowcount
    numrows_seqdb1=cursor_seqdb1.rowcount

Answer 1

执行查询后变量pools 包含一个元组列表（每个元组由一个元素组成），例如[('1'), ('2'), ('3')]。

for pool in pools:
 pool_list.append(pools[0])

执行此代码后pool_list将包含[('1'), ('1'), ('1')]，因为pools[0] == ('1')。
您应该将此代码替换为

for pool in pools:
 pool_list.append(pool[0])