Error while downloading source code inside docker container, also password required when no password has been set up

Android
#1

Was referring to the Android 9 (AOSP) compilation steps by community for BrainyPi,
While running the commands below inside the docker container shell to download the source code, got the below error.

android-builder@b9f7c047e7c6:~/brainypi-android$ repo init -u https://github.com/brainypi/brainypi-android-manifests.git -b android-9.0 -m brainypi-android-9.0-release.xml
  File "/home/android-builder/brainypi-android/.repo/repo/main.py", line 79
    file=sys.stderr)
        ^
SyntaxError: invalid syntax

Also, while trying to run sudo commands inside the docker container shell there is a password required (no password has been set up) and typing anything (or nothing) is giving incorrect password response.

android-builder@b9f7c047e7c6:~/brainypi-android$ apt install python-is-python3
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
android-builder@b9f7c047e7c6:~/brainypi-android$ sudo apt install python-is-python3
[sudo] password for android-builder: 
Sorry, try again.
[sudo] password for android-builder: 
sudo: 1 incorrect password attempt
android-builder@b9f7c047e7c6:~/brainypi-android$ update-alternatives --install /usr/bin/python python /usr/bin/python3
update-alternatives: --install needs <link> <name> <path> <priority>

Use 'update-alternatives --help' for program usage information.
android-builder@b9f7c047e7c6:~/brainypi-android$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10
[sudo] password for android-builder: 
Sorry, try again.
[sudo] password for android-builder: 
sudo: 1 incorrect password attempt
#2

UPDATE:
Replacing the below command

docker exec -it android-build /bin/bash

with,

docker exec -t -u 0 android-build /bin/bash

entered the docker container as root user and did not get the syntax error in the above post.

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