python系列教程70

朋友们,如需转载请标明出处:https://blog.csdn.net/jiangjunshow

声明:在人工智能技术教学期间,不少学生向我提一些python相关的问题,所以为了让同学们掌握更多扩展知识更好地理解AI技术,我让助理负责分享这套python系列教程,希望能帮到大家!由于这套python教程不是由我所写,所以不如我的AI技术教学风趣幽默,学起来比较枯燥;但它的知识点还是讲到位的了,也值得阅读!PS:看不懂本篇文章的同学请先看前面的文章,循序渐进每天学一点就不会觉得难了!

集合操作有各种各样常见的用途。例如,由于项在集合中只能存储一次,集合(set)可以用来把重复项从列表(list)中过滤掉。直接把列表(list)转换为一个集合(set),然后再转换回来即可:

>>> L = [1,2,1,3,2,4,5]

>>> set(L)

{1,2,3,4,5}

>>> L = list(set(L))  # Remove duplicates

>>> L

[1,2,3,4,5]

除了上面的操作外,下面我还给大家展示了更多有关集合的操作。这些操作应用于一个公司的人员名单:

>>> engineers = {'bob','sue','ann','vic'}

>>> managers = {'tom','sue'}



>>> 'bob' in engineers                   # bob是工程师吗?

True



>>> engineers & managers                 # 谁既是工程师又是经理?

{'sue'}



>>> engineers | managers                 # All people in either category

{'vic','sue','tom','bob','ann'}



>>> engineers - managers                 # Engineers who are not managers

{'vic','bob','ann'}



>>> managers - engineers                 # Managers who are not engineers

{'tom'}



>>> engineers > managers                 # Are all managers engineers? (superset)

False



>>> {'bob','sue'} < engineers           # Are both engineers? (subset)

True



>>> (managers | engineers) > managers    # All people is a superset of managers

True



>>> managers ^ engineers                 # Who is in one but not both?

{'vic','bob','ann','tom'}



>>> (managers | engineers) - (managers ^ engineers)        # Intersection!

{'sue'}
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