Python通过for循环向多个指定名称字典批量填充数据的实现问题

首先优化两个基础逻辑：

1. 你请求的是JSON结构接口，不需要用BeautifulSoup解析，也不需要手动切割字符串+eval解析，直接用res.json()就能拿到结构化响应数据，性能和安全性都高很多
2. 不推荐用零散独立变量存三个树种的字典，统一放到一个总字典里管理，循环时直接按key取值即可，比操作全局变量表更安全可控

完整修改后代码 #

import requests
print("Saplings script running...")

# 拉取GE价格
vUrl = "https://prices.runescape.wiki/api/v1/osrs/1h"
headers = {
    'User-Agent': 'Calculating profit/hr methods',
    'From': ''
}
res = requests.get(vUrl, headers=headers)
# 直接解析JSON响应，无需手动处理字符串
price_data = res.json()["data"]

# 统一用总字典存所有树种配置
tree_dict = {
    "Yew": {"SeedID":5315,"SaplingID":5373},
    "Magic": {"SeedID":5316,"SaplingID":5374},
    "Maple": {"SeedID":5314,"SaplingID":5372}
}
vItems = ["Yew","Magic","Maple"]

# 定义要提取的公共字段
extract_fields = ["avgHighPrice", "highPriceVolume", "avgLowPrice", "lowPriceVolume"]

for tree_name in vItems:
    current_tree = tree_dict[tree_name]
    # 获取当前树种对应种子、树苗的价格数据
    seed_price = price_data[str(current_tree["SeedID"])]
    sapling_price = price_data[str(current_tree["SaplingID"])]
    # 8行赋值逻辑完成所有字段填充，符合你的需求
    current_tree["Seed_avgHighPrice"] = seed_price["avgHighPrice"]
    current_tree["Seed_highPriceVolume"] = seed_price["highPriceVolume"]
    current_tree["Seed_avgLowPrice"] = seed_price["avgLowPrice"]
    current_tree["Seed_lowPriceVolume"] = seed_price["lowPriceVolume"]
    current_tree["Sapling_avgHighPrice"] = sapling_price["avgHighPrice"]
    current_tree["Sapling_highPriceVolume"] = sapling_price["highPriceVolume"]
    current_tree["Sapling_avgLowPrice"] = sapling_price["avgLowPrice"]
    current_tree["Sapling_lowPriceVolume"] = sapling_price["lowPriceVolume"]

# 测试输出
for tree_name in vItems:
    t = tree_dict[tree_name]
    print(f"====={tree_name}=====")
    print(t)
    print(t['Seed_avgHighPrice'], t['Seed_highPriceVolume'], t['Seed_lowPriceVolume'], t['Seed_lowPriceVolume'])

如果你一定要保留原有的Yew、Magic、Maple独立全局变量 #

可以通过globals()方法用字符串变量名获取全局对象，修改循环部分即可：

# 原有独立变量保留
Yew = {"SeedID":5315,"SaplingID":5373}
Magic = {"SeedID":5316,"SaplingID":5374}
Maple = {"SeedID":5314,"SaplingID":5372}
vItems = ["Yew","Magic","Maple"]
extract_fields = ["avgHighPrice", "highPriceVolume", "avgLowPrice", "lowPriceVolume"]
price_data = requests.get(vUrl, headers=headers).json()["data"]

for tree_name in vItems:
    # 通过字符串变量名获取全局字典对象
    current_tree = globals()[tree_name]
    seed_price = price_data[str(current_tree["SeedID"])]
    sapling_price = price_data[str(current_tree["SaplingID"])]
    # 后续8行赋值逻辑和上面完全一致
    current_tree["Seed_avgHighPrice"] = seed_price["avgHighPrice"]
    current_tree["Seed_highPriceVolume"] = seed_price["highPriceVolume"]
    current_tree["Seed_avgLowPrice"] = seed_price["avgLowPrice"]
    current_tree["Seed_lowPriceVolume"] = seed_price["lowPriceVolume"]
    current_tree["Sapling_avgHighPrice"] = sapling_price["avgHighPrice"]
    current_tree["Sapling_highPriceVolume"] = sapling_price["highPriceVolume"]
    current_tree["Sapling_avgLowPrice"] = sapling_price["avgLowPrice"]
    current_tree["Sapling_lowPriceVolume"] = sapling_price["lowPriceVolume"]

内容的提问来源于stack exchange，提问作者Yourmotor