gistfile1.py

def valid_loc(loc):
    '''Validates a lat,lng string value to ensure both lat and lng are within their correct bounds'''

    try:
        lng, lat = loc.split(',')
        lng = float(lng)
        lat = float(lat)
    except:
        pass
    else:
        return (-180.0 <= lng <= 180.0) and (-90.0 <= lat <= 90)