TypeError：'

Question

[每当我尝试运行此代码时，它都会得到TypeError：' + =-”的整数

  import cx_Oracle

  conn = cx_Oracle.connect('emu/[email protected]')
  cur = conn.cursor()
  cur.execute("select max(locationid) from location")
  for line in cur:
      maxID = line
  IDofcity = 1
  while IDofcity < maxID:
      cur.execute(f"select city from location where locationid='{IDofcity}'")
      for row in cur:
          Nameofcities = ['']
          Nameofcities.append(row)

  IDofcity += 1

  print(Nameofcities)

  cur.close()
  conn.close()

代码和错误

Answer 1

您是否尝试过：

for line in cur:
  (maxID,) = line

这使maxID引用元组中的值，而不是元组本身。

如果元组中有1个以上的项目，您将得到：

ValueError: too many values to unpack (expected 1)