poem = '''Programming is fun
when the work is done
if you wanna make your work also fun:
use Python!
'''
#poem1 = '''liu'''
#读模式（'r'）、写模式（'w'）或追加模式（'a'）。
#如果有文件就读取，没有就创建
f = open('poem.txt','w')
#f = open('poem.txt','a')
f.write(poem)
#f.write(poem1)
f.close()

type(f)
print(f)

f = open('poem.txt','r')

while True:
 line = f.readline()
 if len(line) == 0:
 break
 print(line, end='')

f.close()

open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)
 ========= ===============================================================
 Character Meaning
 --------- ---------------------------------------------------------------
 'r' open for reading (default)
 'w' open for writing, truncating the file first
 'x' create a new file and open it for writing
 'a' open for writing, appending to the end of the file if it exists
 'b' binary mode
 't' text mode (default)
 '+' open a disk file for updating (reading and writing)
 'U' universal newline mode (deprecated)
 ========= ===============================================================

import pickle as p

shoplistfile = 'shoplist.data'

shoplist = ['apple','mango','carrot']

f = open(shoplistfile,'wb')
#将数据写入打开的文件中
p.dump(shoplist,f)
f.close()

del shoplist

f = open(shoplistfile,'rb')
storedlist = p.load(f)
print(storedlist)

print(__doc__)