Rulebased chat bot.

chatbot.py

import re

keywords = {
'greet': ['.*hello.*', '.*hi.*', '.*howdy.*', '.*hullo.*', '.*how-do-you-do.*'],
'track': ['.*shipment.*', '.*track.*', '.*estimated.*delivery.*'],
'tracking_fullfilment': ['.*myorder:*.'],
'stock': ['.*stock.*', '.*out-of-stock.*'],
'stock_fullfilment': ['.*product_stock:.*']
}

patterns = {}

for intent, keys in keywords.items():
    patterns[intent]=re.compile('|'.join(keys))



responses={
    'greet':'Hello! How can I help you?',
    'track': 'Please type your tracking no. eg: myorder:143567',
    'tracking_fullfilment': 'your order is processing',
    'stock': 'Please type product id. eg: product_stock:123434',
    'stock_fullfilment': 'This product is in stock',
    'default': 'I dont quite understand. Could you repeat that?'
}



def match_intent(message):
    print(message)
    matched_intent = None

    for intent,pattern in patterns.items():
        if re.search(pattern,message):
            matched_intent=intent
    return matched_intent

def respond(message):
    intent=match_intent(message)

    key='default'

    if intent in responses:
        key=intent

    return responses[key]

def send_message(message):
    return respond(message)