如何在不打开的情况下使用 sys.stdin.readline()？

Question

I'm trying to resolve an exercise in python. It has an platform with some pre-code part and I have to enter some code to complete. But usually, I like to try the code in VS Code as well, to understand a little more about the problem. In this case, the resolution was easy, but I couldn't understad the pre-coded part, in order to replicate.

import sys
import xml.etree.ElementTree as etree

def get_attr_number(node): 
    \# your code goes here
    return root

if __name__ == '__main__':
    sys.stdin.readline()
    xml = sys.stdin.read()
    tree = etree.ElementTree(etree.fromstring(xml))
    root = tree.getroot()
    print(get_attr_number(root))

In particular, I couldn't understand the stdin part. Usually i use it for read document, previously opened. How does it read the xml data from the input? This part is blocked, and works in the platform. How can I replicate this process, providing data. The input should be some xml code.

How can I input data from the terminal (Power Shell or terminal from VS Code) so it can process my data and I can execute the def function?

Answer 1

In addition to Barmars precise answer some vsCode idea:

• Implement a dummy implementation:
• save yourprg.py

def get_attr_number(node): 
    # your code goes here
    print ("here is my solution")
    return root
    #enter code here

• In vsCode open below a terminal window and type in:

cat c:/tmp/file.xml | C:/Python/Python311/python.exe c:/tmp/yourprg.py

Folder tmp in only an example. It should be your folder with yourprg. (instead of C:/Python/Python311/python.exe you should type in your full path of your python.exe if not configured in your system or vsCode.