Python简单I/O操作示例

poem = '''
hello
world
'''
f = file('book.txt', 'w') #以write模式打开文件，用于写。(写入的文件编码为UTF-8)
f.write(poem)
f.close()
f = file('book.txt')   #默认以read模式打开文件
while True:
  line = f.readline()  #读取一行，包括行末的换行符
  if len(line) == 0:  #0长度表示读取到EOF
    break
  print "" + str(len(line)) + line,
f.close()
"""输出:
1
6hello
6world
"""

import cPickle as p
#import pickle as p
data = ['a', 1, "cc"]
f = file('list.data', 'w')
p.dump(data, f) #将对象存到文件
f.close
del data
f = file('list.data')
data = p.load(f) #从文件读取对象
print data #输出：['a', 1, 'cc']