python 代码片段11

#coding=utf-8
#python里面的字典，用｛｝来表示
book={'title':'python web development','year':2008}
print book
print 'year' in book
print 'pub'  in book
print book.get('pub','N/A')
book['pub']='Addison Wesley'
print book.get('pub','N/A')
for key in book:
	print key,':',book[key]