使用arcpy游标insertcursor 点生成线的问题

nrows_attr = table_attr.nrows

ncols_attr = table_attr.ncols

fc = "D:/data/gdb.gdb/roads"

outFC = "D:/data/gdb.gdb/roads116"



arcpy.CreateFeatureclass_management(os.path.dirname(outFC),

                                        os.path.basename(outFC),

                                        "POLYLINE", fc)

cursor = arcpy.InsertCursor(outFC)

des = arcpy.Describe(outFC)

shapename = des.shapeFieldName

print  shapename

array = arcpy.Array()

point = arcpy.Point()

for i in range(1,114):

    point.X = round(float(table_coor.cell(i, 7).value), 8)

    point.Y = round(float(table_coor.cell(i, 8).value), 8)

    point.Z = round(float(table_coor.cell(i, 9).value), 8)

    # array.add(point)

    array.add(point)

for feat in array:

    print feat



row = cursor.newRow()

row.setValue(shapename,array)

#polyline = arcpy.Polyline(array)



cursor.insertRow(row)

我是读取excel的经纬度坐标数据（小数点后保留了8位）add到array里然后使用arcpy.polyline(array),为啥生成的线不在对应的点上，就是点线是偏离线的，并且线的节点书小于点的数量，这是怎么回事呢。array存储的坐标我使用循环查看下是和excel的值是一样的，就是说我读取到array坐标点数和数值是正确的，为啥生的线却是错误的呢，是polyline为改变坐标的小数位吗，谢谢