python - TypeError : tuple indices must be integers or slices, 命令中不是 str

Question

嗨，我收到此错误:TypeError:元组索引必须是整数或切片，而不是命令中的 str 在此命令上，我有点不确定这里出了问题。这是我正在使用的代码:

@checks.can_embed()
@commands.command(name="botinfo")
async def botinfo(self, ctx: UKGCtx):
    """Shows advanced information about the bot."""
    char_count = 0
    deaths_count = 0
    levels_count = 0
    with closing(userDatabase.cursor()) as c:
        c.execute("SELECT COUNT(*) as count FROM chars")
        result = c.fetchone()
        if result is not None:
            char_count = result["count"]
        c.execute("SELECT COUNT(*) as count FROM char_deaths")
        result = c.fetchone()
        if result is not None:
            deaths_count = result["count"]
        c.execute("SELECT COUNT(*) as count FROM char_levelups")
        result = c.fetchone()
        if result is not None:
            levels_count = result["count"]

Answer 1

fetchone返回一个序列(在本例中是一个元组)或None，而不是字典。

如果您希望它返回字典，您可以替换 Connection.row_factory就像文档中的这个示例一样:

import sqlite3

def dict_factory(cursor, row):
    d = {}
    for idx, col in enumerate(cursor.description):
        d[col[0]] = row[idx]
    return d

con = sqlite3.connect(":memory:")
con.row_factory = dict_factory
cur = con.cursor()
cur.execute("select 1 as a")
print(cur.fetchone()["a"])