从 JSON 数据库中提取数据 (Python 3)

Question

我想编写一个程序，将 JSON 数据库中的数据加载到 Python 字典列表中，并添加平均温度高于冰点和低于冰点的所有次数。但是，我正在努力从数据库中成功提取信息/我担心我的算法已经关闭。我的计划： 1）定义一个从json文件加载数据的函数。 2) 定义一个从文件中提取信息的函数 3）使用提取的信息来计算温度高于或低于冰点的次数

import json

def load_weather_data(): #function 1: Loads data
    with open("NYC4-syr-weather-dec-2015.json", encoding = 'utf8') as w: #w for weather
        data = w.read()
        weather = json.loads(data)
        print(type(weather))
        return weather

def extract_temp(weather): #function 2: Extracts information on weather
    info = {}
    info['Mean TemperatureF'] = weather['Mean TemperatureF']#i keep getting a type error here
    return info

print("Above and blelow freezing")
weather = load_weather_data()
info = extract_temp(weather)
above_freezing = 0
below_freezing = 0
for temperature in weather: # summing the number of times the weather was above versus below freezing
    if info['Mean Temperature'] >32:
        above_freezing=above_freezing+1
    elif info['mean temperature']<32:
        below_freezing = below_freezing +1

print(above_freezing)
print(below_freezing)

如果您有任何想法，请告诉我！谢谢。

Answer 1

您正试图在开始循环之前从weather 列表中提取一次温度，而实际上您应该为循环中的每个温度对象执行此操作。您尚未发布示例数据，但我认为weather 是list，您正试图将其用作dict。下面是对整洁度的其他一些更改的修复。

import json

# fixed: call with filename so that the function works on other files
def load_weather_data(filename): #function 1: Loads data
    with open(filename, encoding = 'utf8') as w: #w for weather
        # fixed: fewer steps
        return json.load(w)

# fixed: not needed, doesn't simply anything
#def extract_temp(weather): #function 2: Extracts information on weather
#    info = {}
#    info['Mean TemperatureF'] = weather['Mean TemperatureF']#i keep getting a type error here
#    return info

print("Above and blelow freezing")

weather = load_weather_data("NYC4-syr-weather-dec-2015.json")
above_freezing = 0
below_freezing = 0

for temperature in weather: # summing the number of times the weather was above versus below freezing
    if info['Mean Temperature'] > 32:
        above_freezing += 1
    # fixed: capitalized above... so assuming it should be here too
    elif info['Mean Temperature'] < 32:
        below_freezing += 1

print(above_freezing)
print(below_freezing)