第十章、 输入/输出
1) 文件
poem = '''Programming is fun use Python!'''
f = file('poem.txt', 'w') # open for 'w'riting
f.write(poem) # write text to file
f.close() # close the file
可以使用help(file)来了解详情。
2) 储存器
pickle在文件中储存Python对象，cPickle(C语言,更快)
import cPickle as p
shoplistfile = 'shoplist.data'
shoplist = ['apple', 'mango', 'carrot', 'donggua']
f = file(shoplistfile, 'w')
p.dump(shoplist, f) # dump the object to a file
f.close()
#使用pickle
import pickle
object = someClass()
file = open(filename, 'wb') # Create external file
pickle.dump(object, file) # Save object in file
import pickle
file = open(filename, 'rb')
object = pickle.load(file) # Fetch it back later
#使用shelve
import shelve
object = someClass()
dbase = shelve.open('filename')
dbase['key'] = object # Save under key
import shelve
dbase = shelve.open('filename')
object = dbase['key'] # Fetch it back later