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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