Simple Chatbot by Guru.K

Using the concept from python’s NLTK library, lets build a simple chatbot without using any of the Machine Learning or Deep Learning Algorithms. So obviously our chatbot will be a decent one but not an intelligent one.

Source Code:

from nltk.chat.util import Chat, reflections
pairs = [
    [
        r"my name is (.*)",
        ["Hello %1, How are you today ?",]
    ],
     [
        r"what is your name ?",
        ["My name is Chitti and I'm a chatbot ?",]
    ],
    [
        r"how are you ?",
        ["I'm doing good\nHow about You ?",]
    ],
    [
        r"sorry (.*)",
        ["Its alright","Its OK, never mind",]
    ],
    [
        r"i'm (.*) doing good",
        ["Nice to hear that","Alright :)",]
    ],
    [
        r"hi|hey|hello",
        ["Hello", "Hey there",]
    ],
    [
        r"(.*) age?",
        ["I'm a computer program dude\nSeriously you are asking me this?",]
        
    ],
    [
        r"what (.*) want ?",
        ["Make me an offer I can't refuse",]
        
    ],
    [
        r"(.*) created ?",
        ["Guru.K created me using Python's NLTK library ","top secret ;)",]
    ],
    [
        r"(.*) (location|city) ?",
        ['Chennai, Tamil Nadu',]
    ],
    [
        r"how is weather in (.*)?",
        ["Weather in %1 is awesome like always","Too hot man here in %1","Too cold man here in %1","Never even heard about %1"]
    ],
    [
        r"i work in (.*)?",
        ["%1 is an Amazing company, I have heard about it. ",]
    ],
[
        r"(.*)raining in (.*)",
        ["No rain since last week here in %2","Damn its raining too much here in %2"]
    ],
    [
        r"how (.*) health(.*)",
        ["I'm a computer program, so I'm always healthy ",]
    ],
    [
        r"(.*) (sports|game) ?",
        ["I'm a very big fan of Football",]
    ],
    [
        r"who (.*) sportsperson ?",
        ["Messy","Ronaldo","Dhoni"]
],
    [
        r"who (.*) (moviestar|actor)?",
        ["Rajnikanth"]
],
    [
        r"quit",
        ["Bye take care. See you soon :) ","It was nice talking to you. See you soon :)"]
],
]
def Chitti():
    print("Hi, I'm Chitti and I chat alot ;)\nPlease type lowercase English language to start a conversation. Type quit to leave ") #default message at the start
    chat = Chat(pairs, reflections)
    chat.converse()
if __name__ == "__main__":
    chatty()

As you can see we have just hardcoded the probable question and answers in the list pairs.

Lets interact with Chitti :

Hi, I'm Chitti and I chat alot ;)
Please type lowercase English language to start a conversation. Type quit to leave 
>hi
Hello
>what's your location?
Chennai, Tamil Nadu
>how is weather in Chennai?
Weather in chennai? is awesome like always
>is it raining there
None
>is it raining in Chennai?
Damn its raining too much here in chennai?
>which actor you like most?
None
>who is your favorite actor?
Rajnikanth
>I work for Urbantree Infrastures Pvt Ltd
None
>I work in Urbantree Company
urbantree company is an Amazing company, I have heard about it. 
>hi
Hello
>how are you?
I'm doing good
How about You ?
>I am also doing good
None
>I'm also doing good
Nice to hear that
>What is your age
I'm a computer program dude
Seriously you are asking me this?
>Sorry mini
It's alright

The nltk.chat chatbots work on the regex of keywords present in your question. So you can add any number of questions in a proper format so that your chatbot doesn’t get confused in determining the regex.

In this article I have explained in simple steps as to how you can build your own chatbot using NLTK and of course its not an intelligent one.

I hope you guys have enjoyed reading.

Happy Learning !!!

For any doubts/suggestions connect with me over

[email protected] / +91 8667722919