Python的pipe()方法创建一个管道，并分别返回一对可用于读写的文件描述符(r，w)
语法
以下是pipe()方法的语法 -
os.pipe()
参数
- NA
返回值
- 此方法返回一对文件描述符。
示例
以下示例显示了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)
当运行上述程序时，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...
