close、flush、read、readline、seek、tell、truncate、write的使用

1.close关闭文件

 f1= open("ha.log","r+",encoding="utf-8")
 data = f1.read()
 f1.close()
 print(data)

2.flush刷新文件内部缓冲区（强制写入硬盘）

 #!/usr/bin/env python
 f2 = open("ha.log", "a+",encoding="utf-8")
 f2.write("所凝紧锁的眉头")
 f2.flush()
 i = input(">>>")

3.read读取指定字节数据

 #!/usr/bin/env python
 f1= open("ha.log","r+",encoding="utf-8")

 data = f1.read(3)
 f1.close()

 print(data)

一行一行循环读
#!/usr/bin/env python
f = open("ha.log",'r',encoding="utf-8")
#.read()
for line in f :
    print(line)

4.readline仅读取一行数据,可循环读下一行

 #!/usr/bin/env python
 f1= open("ha.log","r+",encoding="utf-8")
 data = f1.readline()
 f1.close()
 print(data)

5.seek指定文件中指针位置  tell获取指针位置

 #!/usr/bin/env python
 f1= open("ha.log","r+",encoding="utf-8")
 d = f1.readline(3)
 print(f1.tell())
 print(f1.seek(6))
 f1.truncate()
 print(d)
 f1.close()

6.truncate截断数据，仅保留指定之前数据

 #!/usr/bin/env python
 f1= open("ha.log","r+",encoding="utf-8")
 d = f1.readline(3)
 print(f1.tell())
 print(f1.seek(6))
 f1.truncate()
 print(d)
 f1.close()

7.write写内容

 #!/usr/bin/env python
 f2 = open("ha.log", "a+",encoding="utf-8")
 f2.write("所凝紧锁的眉头")
 f2.flush()
 i = input(">>>")