python-ply software package provides Lex and Yacc implementation for Python2, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install python-ply
python-ply is installed in your system.
Make ensure the python-ply package were installed using the commands given below,
$ sudo dpkg-query -l | grep python-ply *
You will get with python-ply package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Python |
| Package | python-ply |
| Version | 3.4-3ubuntu2 |
| Description | Lex and Yacc implementation for Python2 |
| Sub Section | Python |