Nextcord机器人天气命令报错：TypeError: string indices must be integers排查

问题场景 #

开发Nextcord Discord机器人时，编写了查询天气的命令，运行!weather "city_name"时触发TypeError：

string indices must be integers, not 'str'

报错位置在location = data["location"]["name"]["localtime"]这一行。

原代码 #

import nextcord
from nextcord.ext import commands
from config import TOKEN, API_KEY
import aiohttp

bot = commands.Bot(command_prefix = "!", intents = nextcord.Intents.all())

@bot.event
async def on_ready():
    print("Bot has connected to Discord")

@bot.command()
async def weather(ctx: commands.Context, *, city):
    url = "http://api.weatherapi.com/v1/current.json"
    params = {
        "key": API_KEY,
        "q": city
    }

    async with aiohttp.ClientSession() as session:
        async with session.get(url, params=params) as responses:
            data = await responses.json()
            
            print(data)
            location = data["location"]["name"]["localtime"]

报错信息 #

string indices must be integers, not 'str'

问题原因 #

你错误地访问了字典层级：data["location"]["name"]返回的是字符串类型（比如城市名称"Beijing"），字符串仅支持用整数下标访问单个字符（如"Beijing"[0]），但你用字符串键"localtime"去访问，直接触发类型错误。

根据WeatherAPI的返回结构，localtime是location字典下的直接子键，和name同级，并非name的子键。

修正方案 #

调整字典访问层级，修改报错行代码：

async def weather(ctx: commands.Context, *, city):
    url = "http://api.weatherapi.com/v1/current.json"
    params = {
        "key": API_KEY,
        "q": city
    }

    async with aiohttp.ClientSession() as session:
        async with session.get(url, params=params) as responses:
            data = await responses.json()
            
            print(data)
            # 正确获取城市名称与本地时间
            city_name = data["location"]["name"]
            local_time = data["location"]["localtime"]
            # 可将结果发送至Discord频道
            await ctx.send(f"{city_name} 的本地时间：{local_time}")

额外建议 #

如果不确定API返回的字典结构，可打印data["location"]查看所有子键，避免层级错误：

print(data["location"])
# 输出示例：
# {'name': 'Beijing', 'region': 'Beijing', 'country': 'China', 'localtime': '2024-05-20 14:30', ...}

内容的提问来源于stack exchange，提问作者Aashish Koundinya