61 lines
1.3 KiB
Python
61 lines
1.3 KiB
Python
value = [1, 2, 3, 4, 5]
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key = ['a', 'b', 'c', 'd', 'e']
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# 以给定内容为键，创建值为空的字典
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dic = dict.fromkeys(key)
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print(dic)
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# 使用dict()根据给定的键、值创建字典
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dic = dict(name = 'aa',age = 23)
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print (dic)
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# zip创建字典
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dic = dict(zip(key, value))
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print(dic)
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# 读取字典内容
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print(dic.get('a'),dic['a'])
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# 字典中定义其它类型数据
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dic['a']= []
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dic['a'].append(12)
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dic['a'].append(13)
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print(dic.get('a'),dic)
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# 遍历字典
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print('遍历字典'.center(50,'*'))
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for i in dic.items():
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print (i)
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for i,j in zip(dic.keys(),dic.values()):
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print(i,dic[i],j)
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# 增加新元素 与更新 与删除
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print('增加新元素'.center(50,'*'))
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dic.setdefault('dd',12)
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print(dic)
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dic['cc']=22
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print(dic)
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dic.update({'dd':13,'ee':[11,22,33,44]})
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print(dic)
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dic.pop('dd')
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print(dic)
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# 字典popitem()方法作用是：随机返回并删除字典中的一对键和值（项）。
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# 为什么是随机删除呢？因为字典是无序的，没有所谓的“最后一项”或是其它顺序。
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# 在工作时如果遇到需要逐一删除项的工作，用popitem()方法效率很高。
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for i in range(7):
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dic.popitem()
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print(dic)
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# 有序字典
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print('有序字典'.center(50,'*'))
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import collections
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dic = collections.OrderedDict()
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dic = {'a':1,'b':2,'c':3}
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print(dic)
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