import sys
sys.stdout.write('hello word')

import sys
a = sys.stdin.read()
print a

close failed: [Errno 22] Invalid argument
Traceback (most recent call last):
  File "t2.py", line 2, in
<module>
    a = sys.stdin.read()
IOError: [Errno 9] Bad file descriptor

#2.py
stdin, stdout = os.popen4('1.py')
for s in stdout.read():
  print '!',s


#1.py
print 'hello'

import sys
sys.stdout.write(sys.stdin.read())

echo "hello python" | ./simple.py

Traceback (most recent call last):
File “D:\python\pipe\simple.py”, line 3, in
sys.stdout.write(sys.stdin.read())
IOError: [Errno 9] Bad file descriptor

import sys

def main(argv = sys.argv):
    # detects whether have pipe line parsing in
    if not sys.stdin.isatty():
        for s in sys.stdin.readlines():
            print "pipe: " + s,
    # param
    L = sys.argv[1:]
    if len(L)!=0:
        print "param: " + str(L)
    sys.exit(0)
    pass

if __name__ == "__main__":
    try:
        main(sys.argv)
    except KeyboardInterrupt:
        pass

D:\python\pipe>echo “wefwef” | toosimply.py
Traceback (most recent call last):
File “D:\python\pipe\toosimply.py”, line 18, in
main(sys.argv)
File “D:\python\pipe\toosimply.py”, line 7, in main
for s in sys.stdin.readlines():
IOError: [Errno 9] Bad file descriptor