为什么我收到以下代码的 KeyError：“0”？

Question

我正在运行以下 for 循环，在第一次迭代后，我收到一个错误。

for index, obj in enumerate(client.list_objects("preprocess", recursive=True), start=1):
    j = get_json("preprocess", f"batch_{index}.json")
    x = client.get_object(
        "preprocess",
        f"batch_{index}.json",
    )
    data = json.load(x)
    calc(data)

以下是计算 function。

def calc(
    df,
):

    lat_pool = data["pickup_longitude"]
    lon_pool = data["pickup_latitude"]
    for key in range(
        len(lat_pool)
    ):
        lat = lat_pool[str(key)]
        lon = lon_pool[str(key)]
        if (lat > zero_point_lat) and (lon > zero_point_long):
            print("Area 1")
        elif (lat < zero_point_lat) and (lon < zero_point_long):
            print("Area 2")
        elif (lat < zero_point_lat) and (lon > zero_point_long):
            print("Area 3")
        elif (lat > zero_point_lat) and (lon < zero_point_long):
            print("Area 4")

第一次迭代成功后，我收到以下错误

Traceback (most recent call last):
  File "/home/andreas/Desktop/mapper/mapper/handler.py", line 101, in <module>
    calc(data)
  File "/home/andreas/Desktop/mapper/mapper/handler.py", line 78, in calc
    lat = lat_pool[str(key)]
KeyError: '0'

我想这与lat = lat_pool[str(key)] ，但我无法解决。

Answer 1

lat_pool 字典没有名为“0”的键 (str(key))

Answer 2

如果你想迭代lat_pool的键，你需要通过调用lat_pool.keys()来明确地这样做

错误可能还有其他原因，具体取决于您的数据如何以及解决这些问题需要其他信息

因此代码将是 -

def calc(
    df,
):

    lat_pool = data["pickup_longitude"]
    lon_pool = data["pickup_latitude"]
    for key in lat_pool.keys():
        lat = lat_pool[str(key)]
        lon = lon_pool[str(key)]
        if (lat > zero_point_lat) and (lon > zero_point_long):
            print("Area 1")
        elif (lat < zero_point_lat) and (lon < zero_point_long):
            print("Area 2")
        elif (lat < zero_point_lat) and (lon > zero_point_long):
            print("Area 3")
        elif (lat > zero_point_lat) and (lon < zero_point_long):
            print("Area 4")