w3af can't workable after apt-get update && apt-get dist-upgrade

root@debian:~# w3af_console
Your python installation needs the following modules to run w3af:
esmre

After installing any missing operating system packages, use pip to install the remaining modules:
sudo pip install esmre

A script with these commands has been created for you at /tmp/w3af_dependency_install.sh
root@debian:~# sudo pip install esmre
sudo: pip: command not found


Could anyone can help with this ?