Latitude longitude distance calculation

The python code for calculating the distance between 2 locations, given their latitude & longitude (in degrees), using the Haversine method. The output is in meters.

import math, cmath

def getDist(lat2,lng2,lat1,lng1):
   lat1 = math.radians(lat1)
   lat2 = math.radians(lat2)
   lng1 = math.radians(lng1)
   lng2 = math.radians(lng2)
   dlat = lat2 - lat1
   dlng = lng2 - lng1
   a = math.pow(cmath.sin(dlat*0.5).real,2) + cmath.cos(lat1).real * cmath.cos(lat2).real * math.pow(cmath.sin(dlng*0.5).real,2)
   d = 2 * cmath.asin(math.sqrt(a)).real
   dist = d * 6378137
   return dist

usage:

   d = getDist(45.6738037,-122.6812485, 47.6062095,-122.3320708)