import re

from types import NoneType

def parse_mapping(line):
    query_pattern, response_template = line.split('|', 1)
    query_pattern = '\\s+'.join(query_pattern.split())
    query_pattern = query_pattern.replace('<', '(?P<')
    query_pattern = query_pattern.replace('>', '>\\w+)')
    response_template = response_template.strip()
    response_template = response_template.replace('<', '%(') # I honestly don't fucking
    response_template = response_template.replace('>', ')s') # care anymore...
    return (re.compile(query_pattern, re.IGNORECASE), response_template)

def get_response(query, responses):
    response = None
    for query_pattern, response_template in responses:
        tokens = query_pattern.match(query)
        if type(tokens) is not NoneType:
            response = response_template % tokens.groupdict()
            break
    return response

sample_responses = []

sample_responses.append(parse_mapping('my name is <name> | Hello, <name>!'))
sample_responses.append(parse_mapping('i like <unk_1> and <unk_2> | Oh yeah? Well I like <unk_1>, but absolutely hate <unk_2>... fuck <unk_2>!'))

get_response('my name is puxlit', sample_responses)
get_response('i like Python and AI', sample_responses)