python 字典的用法

1. 建立一個空字典

dict = {}

2. 判斷字典中有無目標索引

if a in dict

3. 字典中索引的值加一

dict['a'] = dict.get('a', 0) + 1

4. 將字典寫入csv文件

writer = csv.writer(csvfile)
for key, value in dict.items():
    writer.writerow([key, value])

5. 當字典的value是一個list時候

if name not in task:
    task[name] = []