Python os.pipe()方法

Python的pipe()方法建立一個管道，並分別返回一對可用於讀寫的檔案描述符(r，w)

語法

以下是pipe()方法的語法 -

os.pipe()

引數

• NA

返回值

• 此方法返回一對檔案描述符。

範例

以下範例顯示了pipe()方法的用法。

#!/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)

當執行上述程式時，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...