Python3 os.pipe()方法 - tw511教學網

pipe() 方法建立一個管道，並返回一對檔案描述符(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()

引數

返回值

該方法返回一對檔案描述符。

範例

下面的範例顯示 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)

當我們執行上面的程式，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...