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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