python 计算经纬度之间的距离

def get_distance(lon1, lat1, lon2, lat2):
    lon1, lat1, lon2, lat2 = map(radians,
                                 [lon1, lat1, lon2, lat2])  # radians 角度转弧度

    d_lon = lon2 - lon1
    d_lat = lat2 - lat1
    a = sin(d_lat / 2)**2 + cos(lat1) * cos(lat2) * sin(d_lon / 2)**2
    c = 2 * asin(sqrt(a))  # 反正弦
    r = 6371
    return c * r