在 overpass-API 的端点上运行请求的 Python 包装器答案

【问题标题】：Python wrapper to run requests on the endpoint of overpass-API在 overpass-API 的端点上运行请求的 Python 包装器
【发布时间】：2018-07-12 02:53:58
【问题描述】：

我们使用 Overpass API python wrapper 为 OpenStreetMap Overpass API https://github.com/mvexel/overpass-api-python-wrapper 提供了一个精简的 Python 包装器@

我们有一些简单的例子：

import overpass
api = overpass.API()
response = api.Get('node["name"="Salt Lake City"]')

请注意，您不必包含任何输出元语句。包装器将包装这些。我们将得到我们的结果作为一个字典，它表示您将直接从 Overpass API 获得的 JSON 输出。

print [(feature['tags']['name'], feature['id']) for feature in response['elements']]
[(u'Salt Lake City', 150935219), (u'Salt Lake City', 585370637), (u'Salt Lake City', 1615721573)]

我们可以指定响应的格式。默认情况下，我们将使用 responseformat 参数获取 GeoJSON。替代方案是纯 JSON (json) 和 OSM XML (xml)，直接由 Overpass API 输出。

response = api.Get('node["name"="Salt Lake City"]', responseformat="xml")

更新的问题：我们是否也可以获取 cvs - 我们可以使用 python 包装器向 overpass turbo 的端点执行如下请求吗？

[out:csv(::id,::type,"name","addr:postcode","addr:city",
"addr:street","addr:housenumber","website"," contact:email=*")][timeout:30];
area[name="Madrid"]->.a;
( node(area.a)[amenity=hospital];
  way(area.a)[amenity=hospital];
  rel(area.a)[amenity=hospital];);
out;

顺便说一句：我遇到了自述文本中的示例代码被破坏了：当我尝试以下操作时：

print( [(feature['tags']['name'], feature['id']) for feature in response['elements']] )

我得到了错误

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'elements'

This works, though:

print( [(feature['properties']['name'], feature['id']) for feature in response['features']] )

你怎么看？

【问题讨论】：

标签： python json linux openstreetmap overpass-api

【解决方案1】：

你可以试试这个。

import overpass    

api = overpass.API()
query = """
[out:csv(::id,::type,"name","addr:postcode","addr:city",
"addr:street","addr:housenumber","website"," contact:email=*")][timeout:30];
area[name="Madrid"]->.a;
( node(area.a)[amenity=hospital];
  way(area.a)[amenity=hospital];
  rel(area.a)[amenity=hospital];);
out;
"""
resp = api._get_from_overpass(query)
data = [row.split('\t') for row in resp.text.split('\n')]

输出：

for x in data[:5]:
    print(x)

# ['@id', '@type', 'name', 'addr:postcode', 'addr:city', 'addr:street', 'addr:housenumber', 'website', ' contact:email=*']
# ['597375537', 'node', 'Centro de especialidades Emigrantes', '', '', '', '', '', '']
# ['1437313175', 'node', '', '', '', '', '', '', '']
# ['1595068136', 'node', '', '', '', '', '', '', '']
# ['2320596216', 'node', '', '', '', '', '', '', '']

或者

api = overpass.API()
query = """
area[name="Madrid"]->.a;
( node(area.a)[amenity=hospital];
  way(area.a)[amenity=hospital];
  rel(area.a)[amenity=hospital];);
"""
fmt = 'csv(::id,::type,"name","addr:postcode","addr:city","addr:street","addr:housenumber","website"," contact:email=*")'
data = api.get(query, responseformat=fmt)

输出：

for x in data[:5]:
    print(x)

 # ['@id', '@type', 'name', 'addr:postcode', 'addr:city', 'addr:street', 'addr:housenumber', 'website', ' contact:email=*']
 # ['597375537', 'node', 'Centro de especialidades Emigrantes', '', '', '', '', '', '']
 # ['1437313175', 'node', '', '', '', '', '', '', '']
 # ['1595068136', 'node', '', '', '', '', '', '', '']
 # ['2320596216', 'node', '', '', '', '', '', '', '']

【讨论】：