Python based on the Baidu API to obtain latitude and longitude, according to the latitude and longitude of the distance between cities __python

Baidu provides the query latitude and longitude of the API is:

Http://api.map.baidu.com/geocoder?address= the address you want to query &output=xml&key= the key you want to enter

A ready-made key is: F247CDB592EB43EBAC6CCD27F796E2D2 returns JSON

We take the longitude and latitude information of Xi ' an as an example:

Address Bar Input:

Http://api.map.baidu.com/geocoder?address= Xian &OUTPUT=JSON&KEY=F247CDB592EB43EBAC6CCD27F796E2D2

Returns the following JSON information:

{"
    status": "OK",
    "result": {"Location":
        {"
            LNG": 108.953098,
            lat ": 34.2778
        },
        " Precise ": 0,
        " confidence ":" Level
        ":" \u57ce\u5e02 "
    }

return XML

Address Bar Input:

Http://api.map.baidu.com/geocoder?address= Xian &OUTPUT=XML&KEY=F247CDB592EB43EBAC6CCD27F796E2D2

Returns the following XML information:

<GeocoderSearchResponse>
    <status>OK</status>
    <result>
        <location>
            <lat>34.2778</lat>
            <lng>108.953098</lng>
        </location>
        < precise>0</precise>
        <confidence>12</confidence>
        <level> City </level>
    </result>
</GeocoderSearchResponse>

parse the returned XML to get the latitude and longitude of the city

Loc_cache = {}
key = ' F247CDB592EB43EBAC6CCD27F796E2D2 '
def getlocation (addr): From
    urllib Import Urlopen from
    xml.dom.minidom import parsestring
    doc = Urlopen (' http://api.map.baidu.com/geocoder?address= %s&output=xml&key=%s '% (addr, key))
    dom = parsestring (Doc.read ())
    lat = Doc.getelementsbytagname (' Lat ') [0].firstchild.data
    LNG = doc.getelementsbytagname (' LNG ') [0].firstchild.data return
    map (lat , LNG))

calculating distance between cities according to latitude and longitude

def distance (A1, A2):
    Loc1, loc2 = getlocation (A1), getlocation (A2)
    Latdiff = loc1[0]-loc2[0]
    Lngdiff = Loc1 [1]-loc2[1]
    miles = ((69.1*latdiff) **2 + (53.0*lngdiff) **2) **.5 return
    miles*1.6092953

if __name__ = = ' __ main__ ':
    print getlocation (' city ')
    print getlocation (' Xian city ')
    print distance (' City ', ' XI ' an city ')

# [ 33.27447, 114.89338]
# [34.2778, 108.953098]
# 518.801728496