Part A

query=input("query:")
for quote in data_list:
	found_at = quote.lower().find(query.lower())
	if( found_at >= 0):
		print("Found:", "..."+quote[found_at:found_at+50], "...")

​Part B

query=input("query:")
terms = query.split(" ")
for quote in data_list:
	find_counter = 0
	for term in terms:
		found_at = quote.lower().find(term.lower())
		if(found_at >= 0):
			find_counter+=1
	if find_counter == len(terms):
		print("Found:", quote)

​Part C

query=input("query:")
terms = query.split(" ")
no_results = True
for quote in data_list:
	find_counter = 0
	for term in terms:
		found_at = quote.lower().find(term.lower())
		if(found_at >= 0):
			find_counter+=1
	if find_counter == len(terms):
		print("Found:", quote)
		no_results = False
if(no_results):
	print("No results found")

Part D

query=input("query:")
#assume that user will not put AND at the beginning of the sentence
isAND = query.find("AND")

#brute force if-else
#AND search
if isAND > 0:
	#assume user always puts AND with a space before and after
	terms = query.split(" AND ")
	no_results = True
	for quote in data_list:
		find_counter = 0
		for term in terms:
			found_at = quote.lower().find(term.lower())
			if(found_at >= 0):
				find_counter+=1
		if find_counter == len(terms):
			print("Found:", quote)
			no_results = False
	if(no_results):
		print("No results found")
#OR search
else:
	terms = query.split(" OR ")
	no_results = True
	for quote in data_list:
		find_counter = 0
		for term in terms:
			found_at = quote.lower().find(term.lower())
			if(found_at >= 0):
				print("Found:", quote)
				no_results = False
	if(no_results):
		print("No results found")