python集合用法实例分析_Python

python集合用法实例分析

2020-07-09 08:54不吃皮蛋 Python

这篇文章主要介绍了python集合用法,较为详细的分析了Python中集合的常见用法,需要的朋友可以参考下

本文实例讲述了python 集合用法。分享给大家供大家参考。具体分析如下：

									# sets are unordered collections of unique hashable elements

									# Python23 tested   vegaseat   09mar2005

									# Python v2.4 has sets built in

									import sets

									print "List the functions within module 'sets':"

									for funk in dir(sets):

									  print funk

									# create an empty set

									set1 = set([])

									# now load the set

									for k in range(10):

									  set1.add(k)

									print "\nLoaded a set with 0 to 9:"

									print set1

									set1.add(7)

									print "Tried to add another 7, but it was already there:"

									print set1

									# make a list of fruits as you put them into a basket

									basket = ['apple', 'orange', 'apple', 'pear', 'orange', 'banana']

									print "\nThe original list of fruits:"

									print basket

									# create a set from the list, removes the duplicates

									fruits = sets.Set(basket)

									print "\nThe set is unique, but the order has changed:"

									print fruits

									# let's get rid of some duplicate words

									str1 = "Senator Strom Thurmond dressed as as Tarzan"

									print "\nOriginal string:"

									print str1

									print "A list of the words in the string:"

									wrdList1 = str1.split()

									print wrdList1

									# now create a set of unique words

									strSet = sets.Set(wrdList1)

									print "The set of the words in the string:"

									print strSet

									print "Convert set back to string (order has changed!):"

									print " ".join(strSet)

									print

									# comparing two sets, bear with me ...

									colorSet1 = sets.Set(['red','green','blue','black','orange','white'])

									colorSet2 = sets.Set(['black','maroon','grey','blue'])

									print "colorSet1 =", colorSet1

									print "colorSet2 =", colorSet2

									# same as (colorSet1 - colorSet2)

									colorSet3 = colorSet1.difference(colorSet2)

									print "\nThese are the colors in colorSet1 that are not in colorSet2:"

									print colorSet3

									# same as (colorSet1 | colorSet2)

									colorSet4 = colorSet1.union(colorSet2)

									print "\nThese are the colors appearing in both sets:"

									print colorSet4

									# same as (colorSet1 ^ colorSet2)

									colorSet5 = colorSet1.symmetric_difference(colorSet2)

									print "\nThese are the colors in colorSet1 or in colorSet2, but not both:"

									print colorSet5

									# same as (colorSet1 & colorSet2)

									colorSet6 = colorSet1.intersection(colorSet2)

									print "\nThese are the colors common to colorSet1 and colorSet2:"

									print colorSet6