浅谈python中set使用

浅谈python中set使用

In [2]: a = set()  # 常用操作1 

In [3]: a
Out[3]: set() 

In [4]: type(a)
Out[4]: set

In [5]: b = set([1, 3]) 

In [6]: b
Out[6]: {1, 3} 

In [7]: type(b)
Out[7]: set

In [8]: b.update(2)
---------------------------------------------------------------------------
TypeError                 Traceback (most recent call last)
<ipython-input-8-d51e2fe4c50a> in <module>()
----> 1 b.update(2) 

TypeError: 'int' object is not iterable 

In [9]: b.update({2}) 

In [10]: b
Out[10]: {1, 2, 3} 

In [11]: b.update([4]) 

In [12]: b
Out[12]: {1, 2, 3, 4} 

In [13]: a.di
a.difference     a.difference_update a.discard 

In [13]: a.dif
a.difference     a.difference_update 

In [13]: a.difference(b)
Out[13]: set() 

In [14]: a
Out[14]: set() 

In [15]: b.difference(a)
Out[15]: {1, 2, 3, 4} 

In [16]:

常用操作2

In [16]: a.add({1, 3})
---------------------------------------------------------------------------
TypeError                 Traceback (most recent call last)
<ipython-input-16-98cdf4d0875e> in <module>()
----> 1 a.add({1, 3}) 

TypeError: unhashable type: 'set'

In [17]: a.add(4) 

In [18]: a
Out[18]: {4} 

In [19]: a.issu
a.issubset  a.issuperset 

In [19]: a.issubset(b)
Out[19]: True

In [20]: a.remove(4) 

In [21]: a
Out[21]: set() 

In [22]: a.union(b)
Out[22]: {1, 2, 3, 4} 

In [23]: a
Out[23]: set() 

In [24]: b
Out[24]: {1, 2, 3, 4} 

In [25]: b.pop()
Out[25]: 1

In [26]: a.copy(b)
---------------------------------------------------------------------------
TypeError                 Traceback (most recent call last)
<ipython-input-26-9e8a5f057ffd> in <module>()
----> 1 a.copy(b) 

TypeError: copy() takes no arguments (1 given) 

In [27]: a.copy()
Out[27]: set() 

In [28]: c = a.copy() 

In [29]: c
Out[29]: set() 

In [30]: a
Out[30]: set() 

In [31]: a.add({234})
---------------------------------------------------------------------------
TypeError                 Traceback (most recent call last)
<ipython-input-31-6073e02d68a9> in <module>()
----> 1 a.add({234}) 

TypeError: unhashable type: 'set'

In [32]: a.add(234) 

In [33]: c
Out[33]: set() 

In [34]: a
Out[34]: {234}

常用操作3

In [35]: a.clear() 

In [36]: a
Out[36]: set() 

In [39]: a = {1} 

In [40]: b = {1, 2} 

In [41]: a.intersection(b)
Out[41]: {1} 

In [43]: a
Out[43]: {1} 

In [44]: b = {1, 2, 3} 

In [45]: a.union(b)
Out[45]: {1, 2, 3} 

In [45]: a.union(b)
Out[45]: {1, 2, 3} 

In [46]: a & b
Out[46]: {1} 

In [47]: a ^ b
Out[47]: {2, 3} 

In [48]: a - b
Out[48]: set() 

In [49]: b - a
Out[49]: {2, 3}<BR><BR>
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11 In [50]: a > b
Out[50]: False

In [51]: b > a
Out[51]: True

In [52]: a == b
Out[52]: False

In [53]: a != b
Out[53]: True

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