python常用数据结构的常用操作

#===========List=====================
shoplist = ['apple','mango','carrot','banana']
print 'I have ',len(shoplist), ' items to purchase.'
print 'These items are:'
for item in shoplist:
    print item,
print '\nI also have to buy rice.'
shoplist.append('rice')
print 'My shopping list is now', shoplist

print 'I will sort my list now'
shoplist.sort()
print 'Sorted shopping list is', shoplist

print 'The first item I will buy is', shoplist[0]
olditem = shoplist[0]
del shoplist[0]
print 'I bought the', olditem
print 'My shopping list is ',shoplist
#=======================Tuple===================
zoo = ('python','elephant','penguin')
print 'Number of animals in the zoo is',len(zoo)

new_zoo = 'monkey', 'camel', zoo
print 'Number of cages in the new zoo is', len(new_zoo)
print 'All animals in new zoo are', new_zoo
print 'Animals brought from old zoo are',new_zoo[2]
print 'Last animal brought from old zoo is', new_zoo[2][2]
print 'Number of animal in the new zoo is ',\
    len(new_zoo)-1+len(new_zoo[2])
#===========Dictionary======================
ab = {'Swaroop' :'swaroop@swaroopch.com',
      'Larry'   :'larry@wall.org',
      'Matsumoto':'matz@ruby-lang.org',
      'Spammer' :'spammer@hotmail.com'
      }
print "Swaroop's address is", ab['Swaroop']

del ab['Spammer']

print '\nThere are {0} contacts in the address-book.\n'.format(len(ab))
for name, address in ab.items():
    print 'Contact {0} at {1}'.format(name, address)

ab['Guido'] = 'guido@python.org'

if 'Guido' in ab:
    print "\nGuido's address is",ab['Guido']

#=============Sequence==============
print 'Item 0 is',shoplist[0]
print 'Item 3 is',shoplist[3]
print 'Item -2 is',shoplist[-2]

print 'Item 1 to 3 is',shoplist[1:3]
print 'Item start to end is',shoplist[:]
print 'Item step 2 is',shoplist[::2]
#=============Set================
bri = set(['brazil','russia','china','india'])
print 'india' in bri
print 'usa' in bri
bric = bri.copy()
bric.add('france')
print bric.issuperset(bri)
bri.remove('russia')
print bri & bric
#=================References================
print 'Simple Assignment'
mylist = shoplist
del shoplist[0]

print 'shoplist is', shoplist
print 'mylist is', mylist

print 'Copy by making a full slice'
mylist = shoplist[:]
del mylist[0]

print 'shoplist is', shoplist
print 'mylist is', mylist
#=====================String================
name = 'Swaroop'

if name.startswith('Swa'):
    print 'Yes, the string starts with Swa'
if 'a' in name:
    print 'Yes, the string contains the string "a"'
if name.find('war') != -1:
    print 'Yes, the string contains the string "war"'
delimiter = '_*_'
mylist = ['BRAZIL','RUSSIA','INDIA','CHINA']
print delimiter.join(mylist)