Question

我正在尝试将.json文件解析为.kml文件以供绘图程序使用。我将给出一组数据样本以简化问题：

我有一个LocationHistory.json文件，它具有以下结构：

{
 "data" : {
   "items" : [ {
     "kind" : "latitude#location",
     "timestampMs" : "1374870896803",
     "latitude" : 34.9482949,
     "longitude" : -85.3245474,
     "accuracy" : 2149
   }, {
     "kind" : "latitude#location",
     "timestampMs" : "1374870711762",
     "latitude" : 34.9857898,
     "longitude" : -85.3526902,
     "accuracy" : 2016"
   }]
  }
}

我定义了一个解析json数据的函数，然后我想将它提供给“placemark”字符串以写入（输出）到“location.kml”文件中。

def parse_jason_data_to_kml_file():
   kml_file = open('location.kml', "r+")

   #Here I parse the info inside the LocationHistory.json file
   json_file = open('LocationHistory.json')
   json_string = json_file.read()
   json_data = json.loads(json_string)

   locations = json_data["data"]["items"]

   # Here I get the placemark string structure
   placemark = ["<Placemark>",
                "<TimeStamp><when>the “timestampMS” value from the JSON data item</when></TimeStamp>",
                "<ExtendedData>",
                "<Data name=”accuracy”>",
                "<value> the “accuracy” value from the JSON data item </value>]",
                "</Data>",
                "</ExtendedData><Point><coordinates>”longitude,latitude”</coordinates></Point>",
                "</Placemark>"]
   placemark = "\n".join(placemark)

   # Now i try to find certain substrings in the "placemark" string that I would like to replace:
   find_timestamp = placemark.find("the “timestampMS” value from the JSON data item")
   find_accuracy = placemark.find("the “accuracy” value from the JSON data item")
   find_longitude = placemark.find("”longitude")
   find_latitude = placemark.find("latitude”")

   # Next, I want to loop through the LocationHistory.json file (the data list above)
   # and replace the strings with the parsed LocationHistory.json data saved as: 
   # location["timestampMs"], location["accuracy"], location["longitude"], location["latitude"]: 
   for location in locations:                
       if find_timestamp != -1:
           placemark.replace('the “timestampMS” value from the JSON data item', location["timestampMs"])
       if find_accuracy != -1:
           placemark.replace('the “accuracy” value from the JSON data item', location["accuracy"])
       if find_longitude != -1:
           placemark.replace('”longitude', location["longitude"])
       if find_latitude != -1:
           placemark.replace('latitude”', location["latitude"])
       kml_file.write(placemark)
       kml_file.write("\n")

    kml_file.close()

此代码的目的是将包含.json数据的地标字符串写入location.ml文件，该地标字符串如下所示：

<Placemark>
<TimeStamp><when>the “timestampMS” value from the JSON data item</when></TimeStamp>
<ExtendedData>
<Data name=”accuracy”>
<value> the “accuracy” value from the JSON data item </value>
</Data>
</ExtendedData><Point><coordinates>”longitude,latitude”</coordinates></Point>
</Placemark>

输出，如下所示：

<Placemark>
<TimeStamp><when>2013-07-26T22:34:56Z</when></TimeStamp>
<ExtendedData>
<Data name=”accuracy”>
<value>2149</value>
</Data>
</ExtendedData><Point><coordinates>-85.3245474,34.9482949</coordinates></Point>
</Placemark>

<Placemark>
<TimeStamp><when>2013-07-26T22:31:51Z</when></TimeStamp>
<ExtendedData>
<Data name=”accuracy”>
<value>2016</value>
</Data>
</ExtendedData><Point><coordinates>-85.3526902,34.9857898</coordinates></Point>
</Placemark>

如果我尝试运行此代码，则会收到以下错误：

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/Elysium/anaconda/lib/python2.7/site-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 685, in runfile
execfile(filename, namespace)
File "/Users/Elysium/anaconda/lib/python2.7/site-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 78, in execfile
builtins.execfile(filename, *where)
File "/Users/Elysium/Dropbox/LeeV/Task 5 - Location Plotting/ParseToKML.py", line 77, in <module>
parse_jason_data_to_kml_file()
File "/Users/Elysium/Dropbox/LeeV/Task 5 - Location Plotting/ParseToKML.py", line 51, in parse_jason_data_to_kml_file
placemark.replace('the “timestampMS” value from the JSON data item', location["timestampMs"])
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 33: ordinal not in range(128)

这是我的代码或软件问题吗？从各种来源我可以发现它可能与PIP或ascii或其他东西有关，但没有答案可以帮助我......我确定我已经安装了pip ......

任何帮助将不胜感激。我们也欢迎任何改进我的代码的建议：）

谢谢

Answer 1

您可以按以下方式尝试：

placemark = ["<Placemark>",
    "<TimeStamp><when>%(timestampMs)r</when></TimeStamp>",
    "<ExtendedData>",
    "<Data name=\"accuracy\">",
    "<value>%(accuracy)r</value>]",
    "</Data>",
    "</ExtendedData><Point><coordinates>%(longitude)r, %(latitude)r</coordinates></Point>",
    "</Placemark>"]

placemark = "\n".join(placemark)
for location in locations:
    temp = placemark % location
    kml_file.write(temp)
    kml_file.write("\n")

这里，在%(any_dict_key)r中，r转换任何Python对象（这里是any_dict_key的值），然后将其插入到字符串中。因此，对于您的时间戳，您必须将其转换为datetime对象。

您可以阅读文档的这一部分以查看详细信息 - string-formatting-operations

将JSON文件解析为KML文件ascii错误

1 个答案: