Python列表不可调用[重复]答案

【问题标题】：Python list is not callable [duplicate]Python列表不可调用[重复]
【发布时间】：2017-05-14 03:02:57
【问题描述】：

我在 Flask 应用中有一个函数，它返回一些 API 数据

def fetch_trains():
    r = requests.get('https://developer.trimet.org/ws/v2/vehicles/appID/[app id goes here]')
    vehicles = r.json()
    listOfVehicles = []
    for vehicle in vehicles['resultSet']['vehicle']:
        if vehicle['type'] =='rail':
            vehToAdd = Train()

            vehToAdd.bearing = vehicle['bearing']
            vehToAdd.blockID = vehicle['blockID']
            vehToAdd.delay = vehicle['delay']
            vehToAdd.direction = vehicle['direction']
            vehToAdd.extraBlockID = vehicle['extraBlockID']
            vehToAdd.gararge = vehicle['garage']
            vehToAdd.inCongestion = vehicle['inCongestion']
            vehToAdd.latitude = vehicle['latitude']
            vehToAdd.longitude = vehicle['longitude']
            vehToAdd.lastLocID = vehicle['lastLocID']
            vehToAdd.offRoute = vehicle['offRoute']
            vehToAdd.signMessageLong = vehicle['signMessageLong']
            vehToAdd.time = vehicle['time']
            vehToAdd.tripID = vehicle['tripID']
            vehToAdd.vehicleID = vehicle['vehicleID']
            vehToAdd.nextLocID = vehicle['nextLocID']
            listOfVehicles.append(vehToAdd)
    #return jsonify({'List of vehicles':listOfVehicles})
    return listOfVehicles

API 调用中没有返回上面的 listOfVehicles，而是我得到了神秘的

TypeError: 'list' object is not callable

现在，如果我注释掉最后一行，并取消注释 jsonify 行，就可以了。但是在前端解析返回的对象很痛苦。我只想返回 listOfVehicles，但我不知道为什么它不让我。

编辑：我忘记了上面定义的 Train 类：

class Train:
    def __init__(self):
        self.bearing = None
        self.blockID = None
        self.delay = None
        self.direction = None
        self.extraBlockID = None
        self.garage = None
        self.inCongestion = False
        self.latitude = None
        self.longitude = None
        self.lastLocID = None
        self.nextLocID = None
        self.offRoute = False
        self.signMessageLong = None
        self.time = None
        self.tripID = None
        self.vehicleID = None

    def __html__(self):
        return {
            "Bearing": self.bearing,
            "BlockID": self.blockID,
            "Delay": self.delay,
            "Direction": self.direction,
            "extraBlockID": self.extraBlockID,
            "Garage": self.garage,
            "inCongestion": self.inCongestion,
            "Latitude": self.latitude,
            "Longitude": self.longitude,
            "lastLocID": self.lastLocID,
            "nextLocID": self.nextLocID,
            "offRoute": self.offRoute,
            "signMessageLong": self.signMessageLong,
            "time": self.time,
            "vehicleID": self.vehicleID,
            "TripID": self.tripID
        }

编辑2：调用 fetch_trains():

@app.route('/')
@app.route('/get_trains', methods=['GET', 'OPTIONS'])
def get_trains():
    train_list = fetch_trains()

    return train_list

【问题讨论】：

听起来fetch_trains的调用者有问题...
我认为问题超出了您在此处发布的范围。
怎么样？我应该走哪条路？

标签： python json python-3.x flask

【解决方案1】：

问题是您的代码试图返回list。 Flask 并不期望从视图函数返回list 对象，而是response 对象，参考official doc。 jsonify 正在工作，因为它返回一个 JSON 响应对象。

如果你只想返回 listOfVehicles，你可以把它赋值给一个变量，然后渲染到模板，像这样：

from flask import render_template

def get_trains():
    train_list = fetch_trains()

    #return train_list
    return render_template('index.html', train_list=train_list)

在模板中index.html:

{% for train in train_list %}
    {{train}}</br>
{% endfor %}

它将循环遍历train_list，显示所有index.html。

【讨论】：