我想创建打开两个程序的python文件。这两个程序必须多次相互输入。我打开了两个程序并知道如何为一个程序提供输入,但我不知道如何在一个程序上多次输入并多次输出。我的代码是这样的。
subprocess.call("/usr/bin/gcc -o p1 "+path1,shell=True)
subprocess.call("/usr/bin/gcc -o p2 "+path2,shell=True)
cmd_1 = subprocess.Popen("./p1",shell = True,stdin = subprocess.PIPE,stdout = subprocess.PIPE,stderr = subprocess.PIPE)
cmd_2 = subprocess.Popen("./p2",shell = True,stdin = subprocess.PIPE,stdout = subprocess.PIPE,stderr = subprocess.PIPE)
std_out_1 = cmd_1.stdout
std_out_2 = cmd_2.stdout
for line in std_out_1.readlines():
print(line.decode('ascii'))
for line in std_out_2.readlines():
print(line.decode('ascii'))
现在这个程序只是获得程序输出。我想为每个程序提供N次输入并获得N次输出。所以我希望我的代码是这样的。
give_input(n)
for i in range(n):
t_1 = get_output(t_2) //give input t_2, and get output t_1
t_2 = get_output(t_1) //give input t_1, and get output t_2
答案 0 :(得分:0)
通过管道动态交换消息(未经测试):
#!/usr/bin/env python3
from subprocess import Popen, PIPE
with Popen('p1', stdin=PIPE, stdout=PIPE, universal_newlines=True) as p1, \
Popen('p2', stdin=PIPE, stdout=PIPE, universal_newlines=True) as p2:
# give_input(n)
print(n, file=p1.stdin, flush=True)
print(n, file=p2.stdin, flush=True)
for i in range(n):
# t_1 = get_output(t_2) //give input t_2, and get output t_1
print(p1.stdout.read(1), file=p2.stdin, flush=True)
# t_2 = get_output(t_1) //give input t_1, and get output t_2
print(p2.stdout.read(1), file=p1.stdin, flush=True)
它假定子进程期望一行作为请求并返回一个字符作为响应。
使其有效:
p1
,p2
应禁用其内部stdout
缓冲(在程序开头调用setvbuf(stdout, NULL, _IONBF, 0);
)或在{{1}之后调用fflush()
}}。相关:Python C program subprocess hangs at “for line in iter” printf()
,p1
的目录放入p2
或将完整路径$PATH
传递到'p1'
。答案 1 :(得分:-1)
尝试使用write
和communicate
将数据发送到cmd_1
和cmd_2
并获取回复,请参阅https://docs.python.org/3/library/subprocess.html#popen-constructor。
for i in range(n):
cmd_1 = subprocess.Popen("./p1",shell = True,stdin = subprocess.PIPE,stdout = subprocess.PIPE,stderr = subprocess.PIPE)
cmd_2 = subprocess.Popen("./p2",shell = True,stdin = subprocess.PIPE,stdout = subprocess.PIPE,stderr = subprocess.PIPE)
cmd_1.stdin.write(cmd_input[n])
cmd_2.stdin.write(cmd_input[n])
cmd1_stdout, cmd1_stderr = cmd_1.communicate()
cmd2_stdout, cmd2_stderr = cmd_2.communicate()
for line in cmd1_stdout:
print(line.decode('ascii'))
for line in cmd2_stdout:
print(line.decode('ascii'))