Question

我想调用一个脚本，将字符串的内容传递给它的stdin并检索它的标准输出。

我不想触及真正的文件系统，所以我无法为它创建真正的临时文件。

使用subprocess.check_output我可以得到脚本写的任何内容;我怎样才能将输入字符串输入到stdin中？

subprocess.check_output([script_name,"-"],stdin="this is some input")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/subprocess.py", line 537, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 672, in __init__
    errread, errwrite) = self._get_handles(stdin, stdout, stderr)
  File "/usr/lib/python2.7/subprocess.py", line 1043, in _get_handles
    p2cread = stdin.fileno()
AttributeError: 'str' object has no attribute 'fileno'

Answer 1

使用Popen.communicate代替subprocess.check_output。

from subprocess import Popen, PIPE

p = Popen([script_name, "-"], stdin=PIPE, stdout=PIPE, stderr=PIPE)
stdout, stderr = p.communicate("this is some input")

Answer 2

在Python 3.4及更新版本中，您可以使用 input 关键字参数在使用subprocess.check_output()时通过STDIN发送输入

引自the standard library documentation for subprocess.check_output()：

输入参数传递给Popen.communicate()，因此传递给。{} subprocess的标准输入。如果使用它必须是字节序列，或者是字符串if universal_newlines=True。使用时，内部Popen对象是使用stdin=PIPE自动创建， stdin 参数可能不会也可以使用。

示例：

>>> subprocess.check_output(["sed", "-e", "s/foo/bar/"],
...                         input=b"when in the course of fooman events\n")
b'when in the course of barman events\n'
>>> 
>>> # To send and receive strings instead of bytes,
>>> # pass in universal_newlines=True
>>> subprocess.check_output(["sed", "-e", "s/foo/bar/"],
...                         universal_newlines=True,
...                         input="when in the course of fooman events\n")
'when in the course of barman events\n'

Answer 3

这是带有输入的python 2.7的check_output backported版本。

.nav-flex {
    display: flex;
    list-style-type: none;
    padding: 0;
    background-color: #58575f;

    li {
        justify-content: center;

        a {
            align-self: center;
            color: white;
            font-weight: 300;
            font-family: 'Open Sans', sans-serif;
            letter-spacing: .4px;
        }
    }

    @media (max-width: 760px) {
        padding-top: 0;
        flex-wrap: nowrap;
        -webkit-flex-wrap: nowrap;
        flex-direction: column;
        -webkit-flex-direction: column;
        background-color: #f6f6f6;
    }
}

.nav-link-flex {
    display: flex;
    padding: 0 12.5px;
    position: relative;

    @media (max-width: 760px) {
        width: 90%;
        background-color: #494949;
        border-radius: 20px;
        margin-bottom: 10px;
        margin-left: auto;
        margin-right: auto;
        font-size: 22px;
        padding: 10px;
    }

    &:hover {
        background-color: white;

        a {
            color: black;
            text-decoration: none;

            &+ div {
                display: block;
            }
        }
    }

    a {

        &+ div {
            border-radius: 0 0 2px 2px;
            box-shadow: 0 3px 1px rgba(0,0,0,.05);
            display: none;
            font-size: 1rem;
            position: absolute;
            width: 195px;
        }
    }
}

.nav-brand-flex {
    margin-right: auto; 
    display: flex;  
    padding: 5px 0;    

    a {
        display: flex;
        img {

            height: 35px;
            align-self: center;
        } 
    }

    @media (max-width: 760px) {
        margin: 0;
        background-color: #494949;
        width: 100%;
        border-radius: 0;
        font-size: 36px;
        padding: 10px 0;
        margin-bottom: 10px;
    }
}

将数据传递给subprocess.check_output

3 个答案: