可以在Popen()建立子进程的时候改变标准输入、标准输出和标准错误,并可以利用subprocess.PIPE将多个子进程的输入和输出连接在一起,构成管道(pipe),如下2个例子: 代码如下: >>> import subprocess >>> child1 = subprocess.Popen(["ls","-l"], stdout=subprocess.PIPE) >>> print child1.stdout.read(), #...
sub_process = subprocess.Popen(command, stdin = subprocess.PIPE,stdout = subprocess.PIPE,stderr = subprocess.PIPE, shell = True) 为了搞清楚subprocess是怎么获取子进程stdout的,我们首先看看 subprocess.PIPE是什么 进入代码里可以看见subprocess.PIPE 直接是个int -1 再看看网上一般获取subprocess回显的代码 点...
>>> import subprocess >>> res = subprocess.Popen("lm -l",shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE) >>> res.stderr.read() #标准输出错误 '/bin/sh: lm: command not found\n' >>> obj.stderr.close() #关闭启动程序的标准错误 1. 2. 3. 4. 5. 注意:上面的提到的标准...
class subprocess.Popen(args, bufsize=-1, executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None, close_fds=True, shell=False, cwd=None, env=None, universal_newlines=False, startup_info=None, creationflags=0, restore_signals=True, start_new_session=False, pass_fds=()) 参...
stdout, stderr:input: 该参数是传递给Popen.communicate(),通常该参数的值必须是一个字节序列,如果universal_newlines=True,则其值应该是一个字符串。 run()函数默认不会捕获命令执行结果的正常输出和错误输出,如果我们向获取这些内容需要传递subprocess.PIPE,然后可以通过返回的CompletedProcess类实例的stdout和stderr属性...
P=subpross.Popen(cmd,stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True) reshult=p.stdout.read() 以下是执行过程中出现的异常,请问是什么原因? Traceback (most recent call last): File "ping.py", line 3, in <module> ...
importsubprocess p=subprocess.Popen('pip -V',shell=True,stdout=subprocess.PIPE,stderr=subprocess.STDOUT,)# 输出stdoutprint(p.communicate()[0]) 得到结果是byte类型的 代码语言:javascript 代码运行次数:0 运行 AI代码解释 b'pip 21.1.2 from e:\\python36\\lib\\site-packages\\pip (python 3.6)\r...
The parent-child relationship of processes is where the sub in the subprocess name comes from. When you use subprocess, Python is the parent that creates a new child process. What that new child process is, is up to you. Python subprocess was originally proposed and accepted for Python 2.4...
subprocess.run(args, *, stdin=None, input=None, stdout=None, stderr=None, shell=False, timeout=None, check=False, universal_newlines=False) subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False, timeout=None) subprocess.check_call(args, *, stdin=None, stdout=None...
ERROR: Command 'echo to stdout; echo to stderr 1>&2; exit 1' returned non-zero exit status 1. 发送到标准错误的消息被打印到控制台,但是发送到标准输出的消息是隐藏的。 为了防止通过 run()运行的命令的错误消息被写入控制台, 需要将 stderr 参数设置为 subprocess.PIPE。修改后代码如下 ...