[Python] How can I execute a Python script in the REPL interpreter mode and get the exactly...

The Python interpreter can be run either in script or interactive/REPL mode. I do have a Python script as text file but want to run it as if it was manually typed in in the interactive/REPL mode. I want to get the output (stdout) exactly as if this was done. To give an example, assume that I have the following text stored in a file called srcipt.py

a = 5
a + 8
if a < 4:
print("123")
else:
print("xyz")

exit()


I want to execute this script and get the following stdout:

Python 3.12.3 (main, Jun 18 2025, 17:59:45) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = 5
>>> a + 8
13
>>> if a < 4:
... print("123")
... else:
... print("xyz")
...
xyz
>>> exit()


As far as I can see, this is not possible using the python3 command with any of the standard options. So I am looking either for some Bash script or maybe a Python program that would take the path to my script as input and then produce the stdout as required.

If need be, I could also change my input script to look like this:

>>> a = 5
>>> a + 8
>>> if a < 4:
... print("123")
... else:
... print("xyz")
>>> exit()


I feel that what I want should be possible, because I think that doctests doing something not very far from this.

Many thanks for any suggestions or pointers.

Cheers, Thomas.

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