Python3 os.read () method
Python3 OS file / directory methods
Outline
os.read () method is used to read from the file descriptor fd up to n bytes and returns a string containing the bytes read, the corresponding file descriptor fd has reached the end, returns an empty string.
Valid in Unix, Windows in
grammar
read () method syntax is as follows:
os.read(fd,n)
parameter
fd - file descriptor.
n - bytes read.
return value
Returns a string containing the bytes read
Examples
The following example illustrates the read () method of use:
#!/usr/bin/python3
import os, sys
# 打开文件
fd = os.open("f1.txt",os.O_RDWR)
# 读取文本
ret = os.read(fd,12)
print (ret)
# 关闭文件
os.close(fd)
print ("关闭文件成功!!")
The above program output is:
This is test 关闭文件成功!!