5-文件I/O操作

#打开data.txt，创建一个实例f
f = open('data.txt','w')

#向文件中写内容
f.write('I miss the taste of a sweeter life\n')
f.writelines('I miss the conversation\n')       #写入一行自动添加换行符
f.write('I\'m searching for a song tonight\n')

f.flush() #立即写入缓冲区

#关闭文件
f.close()

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

#效率最高的循环方式
for line in f:
    print(line)

f.close()

with open('data.txt','r') as f:
    for line in f:
        print(line)

#效果和上面的代码相同

I miss the taste of a sweeter life
I miss the conversation
I'm searching for a song tonight

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

print(f.readline())
print(f.tell())     #返回当前文件指针的位置36

f.seek(47)
print(f.read(6)) #打印50个字符后10个文字

f.close()

"""
结果:

I miss the taste of a sweeter life

36
conver

"""