>> dic {'aa': 1, 'ab': 3, 'bb': 2} >>> for k in sorted(dic.keys()): print (k)">
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python3.0字典key排序

时间:2021-07-01 10:21:17 帮助过:5人阅读

IDLE 3.0
>>> dic = {"aa":1,"bb":2,"ab":3}
>>> dic
{'aa': 1, 'ab': 3, 'bb': 2}
>>> for k in sorted(dic.keys()):
print (k)

aa
ab


-----------------------------------------------
字典对象其实就是键-值对
下面是字典对象的添加,修改,删除
(修改与添加方法相同,当key值不存在的时候添加)
>>> dic["cc"] = 4
>>> dic
{'aa': 1, 'cc': 4, 'ab': 3, 'bb': 2}
>>> dic["bc"] = 5
>>> dic
{'aa': 1, 'cc': 4, 'ab': 3, 'bb': 2, 'bc': 5}
>>> dic["cc"] = 6
>>> dic
{'aa': 1, 'cc': 6, 'ab': 3, 'bb': 2, 'bc': 5}
>>> del dic["cc"]
>>> dic
{'aa': 1, 'ab': 3, 'bb': 2, 'bc': 5}

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