[Python] Find the closest latitude and longitude

I'm writing a small program and to improve efficiency, I need to be able to find the closest latitude and longitude in my array.

Assume you have the following code:

tempDataList = [{'lat': 39.7612992 , 'lon': -86.1519681},
{"lat": 39.762241, "lon": -86.158436},
{"lat": 39.7622292, "lon": -86.1578917}]

tempLatList = []
tempLonList = []

for item in tempDataList:
tempLatList.append(item['lat'])
tempLonList.append(item['lon'])

closestLatValue = lambda myvalue: min(tempLatList, key=lambda x: abs(x - myvalue))
closestLonValue = lambda myvalue: min(tempLonList, key=lambda x: abs(x - myvalue))

print(closestLatValue(39.7622290), closestLonValue(-86.1519750))


The result I get is:

(39.7622292, -86.1519681)


What it should be is (in this example, the last object in the list)

(39.7622292, -86.1578917)


I know how to get a single value's closest cell but, I would like to make the lambda function to consider both values but I'm not entirely sure how. Help?

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