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Python__14--字典的常用操作
source link: https://blog.51cto.com/husheng/5969384
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Python__14--字典的常用操作
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1 字典的常用操作
1.1 key的判断 in、not in
scores={'张三':100,'李四':98,'王五':90}
print('张三' in scores)
print('张三' not in scores)
1.2 删除指定键值对 del
del scores['张三']
print(scores)
#输出为={'李四':98,'王五':90}
1.3 清空字典元素 scores.clear()
输出为{}
1.4 字典元素的新增
scores['陈六']=66
#输出为scores={'张三':100,'李四':98,'王五':90,'陈六':66}
1.5 字典元素的修改
scores['张三']=88
1.6 获取字典视图
-
scores.keys()
scores={'张三':100,'李四':98,'王五':90} keys=scores.keys() print(keys) #输出为dick.keys(['张三','李四','王五']) print(list(keys)) #输出为['张三','李四','王五'] -
scores.values()
-
scores.items()
scores={'张三':100,'李四':98,'王五':90} keys=scores.items() rint(items) #输出为dick.items([('张三',100),('李四',98),('王五',90)]) print(list(items)) #输出为[('张三',100),('李四',98),('王五',90)]
1.7 字典元素的遍历
测试代码：
scores={'张三':100,'李四':98,'王五':90}
for item in scores:
print(item,scores[item],scores.get(item))
测试结果：
1.8 测试
测试代码：
scores={'张三':100,'李四':98,'王五':90}
print(scores,id(scores))
print('张三' in scores)
print('张三' not in scores)
del scores['张三']
print(scores,id(scores))
scores.clear()
print(scores,id(scores))
scores['陈六']=66
print(scores,id(scores))
scores['张三']=88
print(scores,id(scores))
keys=scores.keys()
print(keys)
测试结果：
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