Python3 os.pipe()方法
pipe() 方法創建一個管道,並返回一對文件描述符(r, w)可用的用於讀取和寫入,
語法
以下是 pipe() 方法的語法:
os.pipe()
參數
- NA
返回值
該方法返回一對文件描述符。
示例
下面的示例顯示 pipe() 方法的使用。
#!/usr/bin/python3
import os, sys
print ("The child will write text to a pipe and ")
print ("the parent will read the text written by child...")
file descriptors r, w for reading and writing
r, w = os.pipe()
processid = os.fork()
if processid:
# This is the parent process
# Closes file descriptor w
os.close(w)
r = os.fdopen(r)
print ("Parent reading")
str = r.read()
print ("text =", str )
sys.exit(0)
else:
# This is the child process
os.close(r)
w = os.fdopen(w, 'w')
print ("Child writing")
w.write("Text written by child...")
w.close()
print ("Child closing")
sys.exit(0)
當我們運行上面的程序,它會產生以下結果:
The child will write text to a pipe and
the parent will read the text written by child...
Parent reading
Child writing
Child closing
text = Text written by child...