python集合使用范例的代码

# 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