Python：读取城市天气预报json数据用matplotlib画高低温双折线

傷城~ 2022-12-28 00:40 126阅读 0赞

以成都的天气预报数据为例，成都的天气预报json接口传入的城市代码为101270101：

import pandas as pd
    import matplotlib.pyplot as plt
    import requests
    import re
    import json
    
    
    def get_data():
        city_code = 101270101
        url = f'http://t.weather.itboy.net/api/weather/city/{city_code}'
        r = requests.get(url=url)
        # f = open('w.json', mode='r', encoding='utf-8')
        # ss = f.read()
        # js = json.loads(ss)
        js = r.json()
        forecast = js['data']['forecast']
        df = pd.DataFrame(data=forecast)
        return df
    
    
    def main():
        df = get_data()
    
        x = df['ymd']
        y_high = df['high']
        y_high = [int(re.findall(r'\d+', v)[0]) for v in y_high]
        y_low = df['low']
        y_low = [int(re.findall(r'\d+', v)[0]) for v in y_low]
    
        plt.rcParams['font.sans-serif'] = ['SimHei']  # 中文乱码
        plt.rcParams['axes.unicode_minus'] = False  # 正负号
    
        # 画布大小
        plt.figure(figsize=(20, 10))
    
        # 标题
        plt.title("成都高温和低温气温变化", fontdict=dict(size=25))
    
        # 高温数据
        plt.plot(x, y_high, label='高温', linewidth=2, color='red', marker='o',
                 markerfacecolor='red', markersize=20)
    
        # 高温数据
        plt.plot(x, y_low, label='低温', linewidth=2, color='blue', marker='^',
                 markerfacecolor='blue', markersize=20)
    
        # 横坐标
        plt.xlabel('日期时间', fontdict=dict(size=15))
        plt.xticks(rotation=45)  # 横坐标值太长，旋转45度
    
        # 纵坐标
        plt.ylabel('气温数值', fontdict=dict(size=25))
    
        # 设置y坐标轴的数值
        for a, l, h in zip(x, y_low, y_high):
            plt.text(x=a, y=l + 0.5, s=l, ha='center', va='top', fontsize=15)
            plt.text(x=a, y=h + 0.5, s=h, ha='center', va='top', fontsize=15)
    
        plt.legend(loc='upper center')
    
        plt.grid(axis='x', which='major', color='black', linestyle='--')
    
        plt.show()
    
    
    if __name__ == '__main__':
        main()

输出结果如图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5ncGhpbA_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5ncGhpbA_size_16_color_FFFFFF_t_70]: /images/20221120/f4cdc2f08729459abf82f6821e133719.png