pipe() 方法创建一个管道,并返回一对文件描述符(r, w)可用的用于读取和写入,
	
语法
		以下是 pipe() 方法的语法:
	
os.pipe()
参数
- 
			NA 
返回值
		该方法返回一对文件描述符。
	
	示例
		下面的示例显示 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)
	
		当我们运行上面的程序,它会产生以下结果:
	
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...
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