# !/usr/bin/env python
# -*- coding:utf-8 -*-
"""
文件读取三步骤:
  1.打开文件
    f=open(file, mode='r', buffering=None, encoding=None, errors=None, newline=None, closefd=True)
      mode: r,w,a,b,+
  2.操作文件
    f.read(),把整个文件读入单一字符串
    f.read(N),读取之后的N个字节
    f.readlines(),读取整个文件到字符串列表
    f.readline(),读取下一行
  3.关闭文件
    f.close()
  f.seek(offset),移动文件指针位置
  f.flush(),把缓冲区数据刷到硬盘中
"""
f=open('吻别.txt',encoding='utf-8')
print(f)
data=f.read()
# data=f.readlines()
print(data)
f.close()

"""
文件写入三步骤:
  1.打开文件
  2.操作文件
    f.write()
    f.writelines(aList),把列表中所有的字符串写入文件
  3.关闭文件
"""
f=open('test.txt',mode='w',encoding='utf-8')
f.write('line01\n')
f.write('line02\n')
f.close()

# !/usr/bin/env python
# -*- coding:utf-8 -*-
from collections import Iterable
try:
  f=open('吻别.txt',mode='r',encoding='utf-8')
  print(isinstance(f, Iterable)) # True，文件也是迭代器类型
  for line in f:
    print(line,end='')
finally:
  f.close()

with open('test.txt',mode='w',encoding='utf-8') as f:
  f.write('line01\nline02\n')
with open('test.txt') as f:
  data = f.read()
  print(data)

with open('美猴王.jpg',mode='rb') as fin,open('美猴王_copy.jpg',mode='wb') as fout:
  data=fin.read()
  fout.write(data)