popen

问题 I needed help regarding the subprocess module. This question might sound repeated, and I have seen a number of articles related to it in a number of ways. But even so I am unable to solve my problem. It goes as follows: I have a C program 2.c it's contents are as follows: #include<stdio.h> int main() { int a; scanf("%d",&a); while(1) { if(a==0) //Specific case for the first input { printf("%d\n",(a+1)); break; } scanf("%d",&a); printf("%d\n",a); } return 0; } I need to write a python script

问题 I'm trying to use my command-line git client and Python's I/O redirection in order to automate some common operations on a lot of git repos. (Yes, this is hack-ish. I might go back and use a Python library to do this later, but for now it seems to be working out ok :) ) I'd like to be able to capture the output of calling git. Hiding the output will look nicer, and capturing it will let me log it in case it's useful. My problem is that I can't get more than the first line of output when I run

问题 I'm using python 3.6 and triying to import pyvb. But when i typed import pyvb, this error occured: no module named popen2 I couldn't find how to install "popen2". Instead, i did this: pip install popen. But it didn't work for me. How can i install popen2? 回答1: This module has been deprecated since version 2.6. You have to use subprocess module now. For migrating you can also use this 来源： https://stackoverflow.com/questions/43582775/modulenotfounderror-no-module-named-popen2-how-can-i-install

问题 I'm using python 3.6 and triying to import pyvb. But when i typed import pyvb, this error occured: no module named popen2 I couldn't find how to install "popen2". Instead, i did this: pip install popen. But it didn't work for me. How can i install popen2? 回答1: This module has been deprecated since version 2.6. You have to use subprocess module now. For migrating you can also use this 来源： https://stackoverflow.com/questions/43582775/modulenotfounderror-no-module-named-popen2-how-can-i-install

问题 I've successfully Faked other module with my own Fake implementation or using monkeypatch . But in this case using both fake implementation or monkeypatch failed for subprocess.Popen : Using monkeypatch , failed. The result still the real opened windows title, not "foo". class TestController: def test_get_all_windows(self, ctrl_fixture, monkeypatch): def fake_communicate(a): return "foo" monkeypatch.setattr(subprocess.Popen, 'communicate', fake_communicate) output = ctrl_fixture.get_all

问题 I've successfully Faked other module with my own Fake implementation or using monkeypatch . But in this case using both fake implementation or monkeypatch failed for subprocess.Popen : Using monkeypatch , failed. The result still the real opened windows title, not "foo". class TestController: def test_get_all_windows(self, ctrl_fixture, monkeypatch): def fake_communicate(a): return "foo" monkeypatch.setattr(subprocess.Popen, 'communicate', fake_communicate) output = ctrl_fixture.get_all

问题 I'm trying to implement a tool that starts 2 ssh connections and executes a script that requires root permission. Here is a very simple implementation: void* SshConnection(void* args) { char buffer[5000]; FILE* popenReturn = NULL; //get the hostname to connect to const char* hostname = (const char*)args; snprintf(buffer, sizeof(buffer), "/usr/bin/gnome-terminal -x bash -c \"" "ssh -t user@%s " "-i /home/user/.ssh/key.key " "\\\"/home/user/DoRootThings.bash\\\" ",hostname); popenReturn = popen

问题 I'm trying to trying to run another script via the shell, that uses a modified set of environment variables. def cgi_call(script, environ): pSCRIPT = subprocess.Popen(script, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, env=environ, shell=True) pc = pSCRIPT.communicate() status = "200 OK" headers = [('Content-Type',"text/html")] if pc[1] != '': raise RuntimeError, pc[1] else: rval = str(pc[0]) return status, headers, rval After running the code above, I get the

问题 I'm trying to trying to run another script via the shell, that uses a modified set of environment variables. def cgi_call(script, environ): pSCRIPT = subprocess.Popen(script, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, env=environ, shell=True) pc = pSCRIPT.communicate() status = "200 OK" headers = [('Content-Type',"text/html")] if pc[1] != '': raise RuntimeError, pc[1] else: rval = str(pc[0]) return status, headers, rval After running the code above, I get the

问题 From the docs using Popen.wait() may: deadlock when using stdout=PIPE and/or stderr=PIPE and the child process generates enough output to a pipe such that it blocks waiting for the OS pipe buffer to accept more data. Use communicate() to avoid that. In communicate docs it's written that: The data read is buffered in memory, so do not use this method if the data size is large or unlimited How to reproduce such a problematic behavior and see that using Popen.communicate() fixes it? Deadlock