Python2.7-NameError：名称“select_pour_point”未定义

我在尝试为每个倾点设置变量时收到此错误。这是一个

cur point=select for point（对于points，name field，name）

NameError：名称“select_pour_point”未定义

帮助！

import shedtools as st

# Directories
SCRATCH = "C:\\SCRATCH"
OUT_FOLDER = "C:\\WATERSHEDS" 

# inputs
POUR_POINTS = "C:\\Hawaii_DEM\\Hawaii.shp"
FLOW_DIRECTION = "C:\\Hawaii_DEM\\hawaii_flwdir" 
STATS_RASTER = "C:\\HawaiiRFGrids_mm\\RF_MM_BI_Ann"                    
RASTER_NAME = "stats"
NAME_FIELD = "Id" 
STATISTICS = "MEAN"

with arcpy.da.SearchCursor(POUR_POINTS, NAME_FIELD) as cursor:
    for point in cursor:
        name = str(point[0])
        print "Working on pour point %s" % (name)
        cur_point = select_pour_point(POUR_POINTS, NAME_FIELD, name) 
        shed_raster = make_watershed_raster(FLOW_DIRECTION, cur_point, name, SCRATCH)

我收到的错误是：

Traceback (most recent call last):
  File "C:\\exercise_5.py", line 30, in 
    cur_point = select_pour_point(POUR_POINTS, NAME_FIELD, name)
NameError: name 'select_pour_point' is not defined

第30行是：

cur_point = select_pour_point(POUR_POINTS, NAME_FIELD, name)