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(">>>")