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我想要一个python脚本,它将启动另一个程序,发送给它一些输入并获得它的输出。如何将数据发送到其他程序并获得答案?
例如,我有这样的C++程序:
#include <iostream>
class BigInt {
...
}
int main() {
BigInt a, b;
std::cin >> a >> b;
std::cout << a.pow(b);
}
而想使用Python这样它来检查:
good = True
for a in range(10):
for b in range(10):
input = str(a) + " " + str(b)
output, exitcode = run("cpp_pow.exe", input) <---
if exitcode != 0:
print("runtime error on", input)
print("exitcode =", exitcode)
good = False
break
r = a ** b
if output != r:
print("wrong answer on", input)
print(output, "instead of", r)
good = False
break
if not good:
break
if good:
print("OK")
什么是最简单的方法是什么?
P.S.可能更容易在python上编写相同的程序:
a, b = map(int, input().split())
print(a ** b)
并通过PowerShell比较他们对许多输入的答案?
编辑:我试着用subprocess
读输出:
from subprocess import Popen, PIPE
p = Popen('p.exe', stdin=PIPE, stdout=PIPE, stderr=PIPE)
stdoutdata, stderrdata = p.communicate(input='2 1 1 2')
print(stdoutdata)
,但它不工作,我无法修复错误次:
File "test.py", line 3, in <module>
stdoutdata, stderrdata = p.communicate(input='2 10')
File "c:\Python33\lib\subprocess.py", line 922, in communicate
stdout, stderr = self._communicate(input, endtime, timeout)
File "c:\Python33\lib\subprocess.py", line 1196, in _communicate
self.stdin.write(input)
TypeError: 'str' does not support the buffer interface
也许你可以使用[特使(https://github.com/kennethreitz/envoy)? – Olian04
你看过** subprocess **模块吗? –
@ Olian04,我如何在Windows上安装它? – Pavel