$ cat script.py
#! /usr/bin/env -S bs
# set -x
# dir="$XDG_RUNTIME_DIR/test"
# mkdir -p "$dir"
# cd "$dir"
# echo "hello" > file
# python3 "$FILE"

with open("file", "r") as f:
    contents = f.read()
    print(contents)


$ ./script.py
+ dir=/run/user/1000/test
+ mkdir -p /run/user/1000/test
+ cd /run/user/1000/test
+ echo hello
+ python3 /home/ayats/Documents/script-bang/script.py
hello