Python-字典的增删改操作
Key的判断
in 指定的key在字典中存在返回True,'张三' in scores
not in 指定的key在字典中不存在返回True,'Marry' not in scores
字典元素的删除
del scores['张三']
字典元素的新增
scores['Jack'] = 90
1 # key的判断 2 scores = {'张三':100, '李四':98, '王五':45} 3 print('张三' in scores) 4 print('张三' not in scores) 5 6 # 删除指定键值对 7 del scores['张三'] 8 print(scores) 9 10 #清空字典的元素 11 scores.clear() 12 print(scores) 13 14 # 增加字典元素 15 scores['陈六'] = 98 16 print(scores) 17 18 # 修改字典元素 19 scores['陈六'] = 100 20 print(scores)