将数据通过管道传输到 IPython 并在处理后保留在会话中

Question

我想将一些数据通过管道传输到 ipython 终端客户端，运行一个命令，然后留在会话中。

就将参数传递给 IPython、运行执行命令并保持会话活动而言，这有效：

[~]$ ipython -i -c "import sys; print(sys.argv[-1])" "my,testcsv\n1,2,3"
Python 3.7.3 (default, Mar 27 2019, 16:54:48)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.23.1 -- An enhanced Interactive Python. Type '?' for help.
my,test,csv\n1,2,3

In [1]:

但是添加管道既会在 Python 中引发异常，又会立即返回到 shell:

[~]$ echo "my,test,csv\n1,2,3" | ipython -i -c "import sys; print(sys.argv[-1])"
Python 3.7.3 (default, Mar 27 2019, 16:54:48)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.23.1 -- An enhanced Interactive Python. Type '?' for help.
import sys; print(sys.argv[-1])

In [1]:   File "<ipython-input-1-f826f34ba2b7>", line 1
    my,test,csv\n1,2,3
                      ^
SyntaxError: unexpected character after line continuation character


In [2]: Do you really want to exit ([y]/n)?
[~]$                                 ^

并使用 xargs 正确处理输入，但它也会立即退出回到 shell:

[~]$ echo "my,test,csv\n1,2,3" | xargs -0 ipython -i -c "import sys; print(sys.argv[-1])"
Python 3.7.3 (default, Mar 27 2019, 16:54:48)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.23.1 -- An enhanced Interactive Python. Type '?' for help.
my,test,csv\n1,2,3


In [1]: Do you really want to exit ([y]/n)?
[~]$

有什么方法可以实现我在这里的目标吗？

Answer 1

我认为它在从标准输入读取 EOF 时正在退出。 true | ipython -i 也立即退出。就此而言，true | python -i.

也是如此

相反，您可以使用 process substitution 将命令的标准输出作为文件获取。

tmp.py:

import sys

fname = sys.argv[-1]
with open(fname) as f:
    print(f.read())

$ ipython --no-banner -i tmp.py <(echo "foo")
foo


In [1]:

将数据通过管道传输到 IPython 并在处理后保留在会话中

Pipe data into IPython and remain in the session after processing it

python

bash

ipython