week09_103428079_林佳章

1.上課心得
    聽同學報告

2.本週作業

上週作業

使用 函數編輯器 寫一個getZone的函數
語法跟Python一樣

#-*- coding: utf-8 -*- 
from qgis.core import *
from qgis.gui import *

@qgsfunction(args='auto', group='Custom')
def getZone(value, feature, parent):
 
 Zone ={
   u'可耕地':[11,12,13],
   u'靜止水體':[30,2031,2032,2033,9010],
   u'林業':[20],
   u'河道':[2011],
   u'草地':[42,3111,5011,5012,5013,5014,9020,9040],
   u'裸露地':[2040,7011,7021,9030,9050,9060,9071],
   u'不透水層':[41,50,1010,1021,1022,1023,1024,1025,1031,1032,1033,1034,1035,1036,1037,1038,1039,1041,1042,1043,2012,2013,2014,2020,3011,3012,3021,3022,3023,3024,3030,3031,3032,3041,3042,3043,3044,3045,3050,3060,3070,3081,3082,3083,3084,3091,3092,3093,3094,3095,3096,3097,3098,3099,3100,3112,3120,3030,3140,4010,4020,4030,5020,5030,6010,6020,7022,8000,9072,9073]
 }
 
 for key in Zone:
     if value in Zone[key]:
         return key

Python語法:

    串列(list)
          宣告
                  type = [11, 12 ,13]
          取值
                  type[0] => 11
                  type[1] => 12
       判斷式
                 11   in  type      => true
                 633 in  type      => false

    字典(dict)
                   由key:value配對的資料型態
                   key值必須為唯一 value則沒有限制
            宣告
                    d = { 1:"a" , 2:"b" , 'pass':"You can't pass!"}
            取值
                   d[1] => a
                   d[2] => b
 範例
假設 value = 11

 for key in Zone:             # key = u'可耕地'
     if value in Zone[key]:   # Zone[u'可耕地']的value是[11,12,13] 

                                     # value in Zone[key] 等於 11 in [11,12,13] =>true 
         return key           # true : 回傳key值 u'可耕地'

3.國外網站


Getting Started With Python Programming

http://www.qgistutorials.com/en/docs/getting_started_with_pyqgis.html