Python 将元组更改为字典,它如何正确设置键值?
我正在使用SQLAlchemy将数据插入MySQL数据库并进行查询。当我这样做的时候 result=db.engine.executequery.fetchall它给了我一个元组列表 结果=[1,加拿大,多伦多,…,2,加拿大,温哥华,…] 我想了解,当我将每个元组更改为dictionary时,python如何正确地分配适当的键 这是我的python代码:Python 将元组更改为字典,它如何正确设置键值?,python,sqlalchemy,Python,Sqlalchemy,我正在使用SQLAlchemy将数据插入MySQL数据库并进行查询。当我这样做的时候 result=db.engine.executequery.fetchall它给了我一个元组列表 结果=[1,加拿大,多伦多,…,2,加拿大,温哥华,…] 我想了解,当我将每个元组更改为dictionary时,python如何正确地分配适当的键 这是我的python代码: with open('static/db/final_cities_countries.json') as f: data
with open('static/db/final_cities_countries.json') as f:
data = json.load(f)
# if data exists grab data, if not query again and store into db, then grab data
query = db.select([Aqi]).where(Aqi.Country == country)
result = db.engine.execute(query).fetchall()
if len(result) < 1:
list_of_cities = data[country]
for city in list_of_cities:
# store into db if aqi_call is ONLY successful with status:ok
if get_aqi(city) != None:
aqi_response = get_aqi(city)
lat = aqi_response['data']['city']['geo'][0]
lng = aqi_response['data']['city']['geo'][1]
time = aqi_response['data']['time']['s']
# creating instance of Aqi class(row in MySQL table) and inserting into aqi table
aqi_data = Aqi(country, city, aqi_response['data']['aqi'], lat, lng, time)
db.session.add(aqi_data)
db.session.commit()
# this time it will have more
query = db.select([Aqi]).where(Aqi.Country == country)
# result = [(id, country, city,...), (id, country, city,...), ...etc.]
result = db.engine.execute(query).fetchall()
# sending back list of dictionaries. [{id:x, country:y, city:z,...}, {},{},...]
return jsonify([dict(row) for row in result])
当我更改每个元组时,它会正确返回
[{id:1,国家:加拿大,城市:多伦多,},{id:2,国家:加拿大,城市:温哥华,},]
在将元组转换为字典时,我们从未指定键名,它怎么知道呢?它们不是普通元组,而是行为既像元组又像有序映射的实例。字符串键是从查询中的列名派生的。。谢谢