A question about subprocess taking input from command line and returning output!

[DeaD_EyE]

Don't forget that the built-in print function has a file keyword where to output the text.
In the case where a line has no line-ending/line-seperator, you could use the print funciton.
It adds by default a newline to the end of the string. This could be controlled with the keyword end

In [1]: print?                                                                  
Docstring:
print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)

Prints the values to a stream, or to sys.stdout by default.
Optional keyword arguments:
file:  a file-like object (stream); defaults to the current sys.stdout.
sep:   string inserted between values, default a space.
end:   string appended after the last value, default a newline.
flush: whether to forcibly flush the stream.
Type:      builtin_function_or_method