MySQL连接器方法“fetchone”和“fetchmany”不符合PEP 249

具有 Python 3.6.2 和 MySQL Connector 2.1.6 Windows 10上的软件包,不调用 execute 不 SELECT CREATE DROP , ALTER INSERT DELETE , UPDATE 等)得出以下结果:

>>> import mysql.connector
>>> session = mysql.connector.connect(user = "root", database = "mysql")
>>> cursor = session.cursor()
>>> cursor.fetchone()
>>> cursor.fetchmany()
[]
>>> cursor.fetchall()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Maggyero\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 891, in fetchall
    raise errors.InterfaceError("No result set to fetch from.")
mysql.connector.errors.InterfaceError: No result set to fetch from.
>>> cursor.execute("CREATE TABLE test (x INTEGER)")
>>> cursor.fetchone()
>>> cursor.fetchmany()
[]
>>> cursor.fetchall()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Maggyero\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 891, in fetchall
    raise errors.InterfaceError("No result set to fetch from.")
mysql.connector.errors.InterfaceError: No result set to fetch from.

PEP 249 明确说明 fetchone , fetchmany 和 fetchall 方法:

那为什么不呢 获取一个 获取许多 获取全部 ?