我收到 "nonetype" 错误，但我不知道为什么

Question

所以我基本上知道错误是什么意思，但我不知道为什么我 it.I 想将我的 cvs 文件插入 table。有些行是空的，这就是为什么我使用 if None...

我得到的错误：

文件 "C:\Users\Desktop\IngestData.py"，第 64 行，在机构中 cokey = temp[0] 类型错误：'NoneType' 对象不是下标table

希望有人能帮助我！提前致谢！

def institutions(cur):
    with open('persons.csv', 'r', encoding="utf-8") as g:
        #tempo = None
        reader = csv.reader(g)
        next(reader)
        for row in reader:
            if row[4] is None:
                break
            else:
                cur.execute("SELECT COKEY FROM countries WHERE Name = (%s)", [row[4]])
                temp = cur.fetchone()
                cokey = temp[0]
                cur.execute("""INSERT INTO institutions (Name,cokey) VALUES (%s,%s)
                            ON CONFLICT DO NOTHING;""",[row[3],cokey])

Answer 1

您的数据库中是否有匹配的行？ cur.fetchone() 返回 None，这就是为什么您的错误是 NoneType is not suscriptable。

def institutions(cur):
    with open('persons.csv', 'r', encoding="utf-8") as g:
        #tempo = None
        reader = csv.reader(g)
        next(reader)
        for row in reader:
            if row[4] is None:
                break
            else:
                cur.execute("SELECT COKEY FROM countries WHERE Name = (%s)", [row[4]])
                temp = cur.fetchone()
                if temp:
                    cokey = temp[0]
                    cur.execute("""INSERT INTO institutions (Name,cokey) VALUES (%s,%s) ON CONFLICT DO NOTHING;""",[row[3],cokey])

Answer 2

将行 if row[4] is None 条件更改为 if row[4] is not None，如下所示：

for row in reader:
    if row[4] is not None:
        cur.execute("SELECT COKEY FROM countries WHERE Name = (%s)", [row[4]])
                temp = cur.fetchone()
                cokey = temp[0]
                cur.execute("""INSERT INTO institutions (Name,cokey) VALUES (%s,%s)
                            ON CONFLICT DO NOTHING;""",[row[3],cokey])

我收到 "nonetype" 错误，但我不知道为什么

Im getting the "nonetype" error but i cant figure out why

python

mysql

error-handling

typeerror

nonetype