How to properly pull an apk using adb and subprocess in python

I'm trying to get apks based on the number it falls on on the select menu but I can't seem to get apk path when I enter it's number on the selection menu using adb and subprocess I aim to use apktool to decompile it when it's done but this is what I get when I enter the number on the select menu.

/system/bin/sh: <stdin>[1]: 15: inaccessible or not found

I read the docs and followed it closely below here is my code what am I doing wrong?
I would love to know.

#  Create a select menu of all the available packages on the emulator and let the user choose one
output = subprocess.run(["adb", "-s", device_id, "shell", "pm", "list", "packages", "-3"], capture_output=True).stdout.decode("utf-8")
packages = output.strip().split("\n")
print("Available packages:")
for i, package in enumerate(packages):
    print(f"{i+1}: {package}")
package_index = int(input("Enter the number of the package to extract: ")) - 1
print(package_index)

# Print the path of the selected package and extract it to the local filesystem
package = packages[package_index]
print(package)
##print(packages)
package_name = package.split(":")[1]
print(package_name)
new_output = subprocess.run(["adb","-s", device_id, "shell", "pm", "path", package_name], capture_output=True).stdout.decode("utf-8")
package_path = new_output.strip().split(":")[1]
#print(output)
#print(package_path)

#print(f"Full path of {package_name}: {package_path}")
apk_type = input("Enter 1 to extract a single APK file, or 2 to extract a split APK: ")
if apk_type == "1":
    print("Hhhhh")
    #subprocess.run(["adb" ,"-s", device_id, "pull", package_path, f"{package_name}.apk"])
else:
    print("Working in progress......................................")

You should use adb shell pm path packageId instead. So from

new_output = subprocess.run(["adb","-s", device_id, "shell", "pm grant", "path", package_name], capture_output=True).stdout.decode("utf-8")

to

new_output = subprocess.run(["adb","-s", device_id, "shell", "pm", "path", package_name], capture_output=True).stdout.decode("utf-8")

after this change your python script will work.

Below the updated script, running against an emulator (tested with Python3.8.12, MacOS):

import subprocess
device_id="emulator-5554"

#  Create a select menu of all the available packages on the emulator and let the user choose one
output = subprocess.run(["adb", "-s", device_id, "shell", "pm", "list", "packages", "-3"], capture_output=True).stdout.decode("utf-8")
packages = output.strip().split("\n")
print("Available packages:")
for i, package in enumerate(packages):
    print(f"{i+1}: {package}")
package_index = int(input("Enter the number of the package to extract: ")) - 1
print(package_index)

# Print the path of the selected package and extract it to the local filesystem
package = packages[package_index]
print(package)
##print(packages)
package_name = package.split(":")[1]
print(package_name)
new_output = subprocess.run(["adb","-s", device_id, "shell", "pm", "path", package_name], capture_output=True).stdout.decode("utf-8")
package_path = new_output.strip().split(":")[1]
#print(output)
#print(package_path)

#print(f"Full path of {package_name}: {package_path}")
apk_type = input("Enter 1 to extract a single APK file, or 2 to extract a split APK: ")
if apk_type == "1":
    print("Hhhhh")
    subprocess.run(["adb" ,"-s", device_id, "pull", package_path, f"{package_name}.apk"])
else:
    print("Working in progress......................................")

You can not pull apk file /data/app/xxx/xx.apk directly, try copy it to some 'normal' path:

adb shell "cp /data/app/xxx/base.apk /sdcard/"
adb pull /sdcard/base.apk ./package_name.apk