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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