025-027字典与集合

字典dict：索引不好用时

dir(dict):.fromkeys&.keys()& .values()&.items()&.get()&clear/copy

dict1={'李宁':'一切皆有可能','耐克':'Just do it','阿迪达斯':'Impossible is nothing','鱼C工作室':'让编程改变世界'}
print('鱼C工作室的口号是：',dict1[('鱼C工作室')])

dict2={1:'one',2:'two',3:'three',}
print(dict2[2])

>>> a = dict(one=1, two=2, three=3)

>>> b = {'one': 1, 'two': 2, 'three': 3}

>>> c = dict(zip(['one', 'two', 'three'], [1, 2, 3]))

>>> d = dict([('two', 2), ('one', 1), ('three', 3)])

>>> e = dict({'three': 3, 'one': 1, 'two': 2})

dict3=dict((("F",70),("i",105),("s",115),("h",104),("C",67)))
>>>dict3
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}

dict4=dict(小甲鱼='让编程改变世界',苍井空='让AV征服所有宅男')
>>> dict4
{'小甲鱼': '让编程改变世界', '苍井空': '让AV征服所有宅男'}

dict4=dict(小甲鱼='让编程改变世界',苍井空='让AV征服所有宅男')

>>> dict4{'小甲鱼': '让编程改变世界', '苍井空': '让AV征服所有宅男'}

>>> dict4['苍井空']='所有者AV从业都要通过学习编程来提高职业技能'

>>> dict4{'小甲鱼': '让编程改变世界', '苍井空': '所有者AV从业都要通过学习编程来提高职业技能'}

>>> dict4['Thomas Edison']='The talent is 1% inspiration adds on 99% sweat, certainly, does not have that 1% inspiration, in the world all sweat to put or bringtogether also only is the sweat!'

>>> dict4{'小甲鱼': '让编程改变世界', '苍井空': '所有者AV从业都要通过学习编程来提高职业技能', 'Thomas Edison': 'The talent is 1% inspiration adds on 99% sweat, certainly, does not have that 1% inspiration, in the world all sweat to put or bringtogether also only is the sweat!'}

>>> dict1.fromkeys((1,2,3))
{1: None, 2: None, 3: None}
>>> dict1.fromkeys((1,2,3),'number')
{1: 'number', 2: 'number', 3: 'number'}
>>> dict1.fromkeys((1,2,3),('one','two','three'))
{1: ('one', 'two', 'three'), 2: ('one', 'two', 'three'), 3: ('one', 'two', 'three')}
>>> dict1.fromkeys((1,3),'数字')
{1: '数字', 3: '数字'}

dict1=dict1.fromkeys(range(30),'赞！')
for eachKey in dict1.keys():
    print(eachKey)
for eachValue in dict1.values():
    print(eachValue)
for eachItem in dict1.items():
    print(eachItem)
print(dict1[32])
dict1.get(32)
>>> 32 in dict1
False
>>> 29 in dict1
True
>>> print(dict1.get(32))
None
>>> dict1.get(32,'木有')
'木有'

>>> dir(dict)
['__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']
>>> a={'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}
>>> b=a
>>> c=a.copy()
>>> a
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}
>>> b
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}
>>> c
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}
>>> id(a)
2020710601784
>>> id(b)
2020710601784
>>> id(c)
2020710646552

>>> c[6]='小甲鱼'
>>> c
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67, 6: '小甲鱼'}
>>> b
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}
>>> a
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67}

>>> c.popitem()
('h', 104)

>>> a.setdefault('小黑鱼')
>>> a
{'F': 70, 'i': 105, 's': 115, 'h': 104, 'C': 67, '小黑鱼': None}

 集合set：没有体现映射关系，元素唯一性是他的特征

>>> num={}
>>> type(num)
<class 'dict'>
>>> num2={1,2,3,4}
>>> type(num2)
<class 'set'>

>>> num2={1,2,3,4,5,4,3,2,1}
>>> num2
{1, 2, 3, 4, 5}

>>> set1=set([1,2,3,4,5,4,3,'小甲鱼'])
>>> set1
{1, 2, 3, 4, 5, '小甲鱼'}

>>> num1=[1,2,3,4,5,6,7,6,5,4,3,2,1,0]
>>> temp=[]
>>> for each in num1:
if each not in temp:
temp.append(each)

>>> temp
[1, 2, 3, 4, 5, 6, 7, 0]
>>> num1=list(set(num1))
>>> num1
[0, 1, 2, 3, 4, 5, 6, 7]
>>> num2
{1, 2, 3, 4, 5}
>>> 1 in num2
True
>>> '1' in num2
False
>>> num2.add(6)
>>> num2
{1, 2, 3, 4, 5, 6}
>>> num2.remove(5)
>>> num2
{1, 2, 3, 4, 6}

>>> num3
frozenset({1, 2, 3, 4, 6})

 集合类型內建方法