The code uses place holders with numbered indexes and String
“format” Method to specify the format of the response and then
create the response. Make sure you understand these ideas by going
through the code. Focus on how the response pattern is specified in
list “eliza_engine” and formatted response is generated using
“format” method inside the “regex_replace” function. • The
parameters to “format” method uses the idea of unpacking operator
(*) in Python applied to collection data types such as lists and
tuples. Make sure you understand this idea as well. 3. At current
situation, the “regex_replace” function returns combination of “You
Said: ” and the input, as the response for inputs shown in the
following table.

1)

Add a rule to the list “eliza_engine” so that the corresponding
output given in the table will be returned for such string

2) you should be comfortable with searching using regular
expression in Python and the ideas of using “re.search” method,
accessing capture groups in search results, using format function
and place holders to format strings, using unpack operator in
Python and writing regular expressions with capture groups.

import re

def simple_eliza_demo(user_input):
uip = user_input.upper()
eliza_engine = [ [“^.* I’M (DEPRESSED|SAD) .*”, “I AM SORRY TO HEAR
YOU ARE {0}”, “true” ] ,
[“^.* I AM (DEPRESSED|SAD) .*”, “WHY DO YOU THINK YOU ARE {0}”,
“true” ],
[“^.* ALWAYS .*”, “CAN YOU THINK OF A SPECIFIC EXAMPLE?”, “false”
],
[“^.* ALL .*”, “IN WHAT WAY?”, “false”] ]
for rule in eliza_engine:
response = regex_replace(uip, rule[0], rule[1], rule[2])
if(response):
return response
return “You Said: ” + uip

def regex_replace(text, pattern, response, add_match):
result = re.search(pattern, text);
if(result):
if(add_match == ‘true’):
return response.format(*result.groups());
return response;
inputs = [ “Hello! I’M depressed and tired.”,
“Hello! I AM depressed and tired.”,
“Hello! I’M sad and tired.”,
“Hello! I AM tired and sad.”,
“Hello! I’M tired and sleepy.”,
“Men are all alike.”,
“They aere always bugging us about something or other.”,
“Well, my boyfriend made me come here.”,
“He says I’m depressed much of the time.” ]

for inp in inputs:
print(“Input: ” + inp)
print(“Response: ” + simple_eliza_demo(inp))