# Do you ever wish you could talk like Siegfried of KAOS ?

## YES, of course you do!

https://en.wikipedia.org/wiki/Get_Smart



# Task

Write the function ```siegfried``` to replace the letters of a given sentence.

Apply the rules using the course notes below. Each week you will learn some more rules.

Und by ze fifz vek yu vil be speakink viz un aksent lik Siegfried viz no trubl at al!


# Lessons

## Week 1

* ```ci``` -> ```si```
* ```ce``` -> ```se```
* ```c``` -> ```k``` (except ```ch``` leave alone)

## Week 2

* ```ph``` -> ```f```

## Week 3

* remove trailing ```e``` (except for all 2 and 3 letter words)
* replace double letters with single letters (e.g. ```tt``` -> ```t```)

## Week 4

* ```th``` -> ```z```
* ```wr``` -> ```r```
* ```wh``` -> ```v```
* ```w``` -> ```v```

## Week 5

* ```ou``` -> ```u```
* ```an``` -> ```un```
* ```ing``` -> ```ink``` (but only when ending words)
* ```sm``` -> ```schm``` (but only when beginning words)



# Notes

* You must retain the case of the original sentence
* Apply rules strictly in the order given above
* Rules are cummulative. So for week 3 first apply week 1 rules, then week 2 rules, then week 3 rules

Difficulty: EASY
Tags: Fundamentals

Starter code:
def siegfried(week, txt):
	

Solutions:
import re
PATTERNS = [re.compile('(?i)ci|ce|c(?!h)'), re.compile('(?i)ph'), re.compile('(?i)(?<!\\b[a-z]{1})(?<!\\b[a-z]{2})e\\b|([a-z])\\1'), re.compile('(?i)th|w[rh]?'), re.compile('(?i)ou|an|ing\\b|\\bsm')]
CHANGES = {'ci': 'si', 'ce': 'se', 'c': 'k', 'ph': 'f', 'th': 'z', 'wr': 'r', 'wh': 'v', 'w': 'v', 'ou': 'u', 'an': 'un', 'ing': 'ink', 'sm': 'schm'}

def change(m):
	tok = m.group(0)
	rep = CHANGES.get(tok.lower(), '' if None in m.groups() else m.group()[0])
	if tok[0].isupper():
		rep = rep.title()
	return rep

def siegfried(week, txt):
	for n in range(week):
		txt = PATTERNS[n].sub(change, txt)
	return txt


import re

def siegfried(week, txt):
	if week >= 1:
		txt = re.sub('c(?!h)', 'k', re.sub('C(?!h)', 'K', txt.replace('ci', 'si').replace('Ci', 'Si').replace('ce', 'se').replace('Ce', 'Se')))
	if week >= 2:
		txt = txt.replace('ph', 'f').replace('Ph', 'F')
	if week >= 3:
		txt = re.sub('([A-z]{2,})e([-!?]+)', '\\1\\2', ' '.join([x.rstrip('e') if len(x) > 3 else x for x in re.sub('([A-z])\\1', '\\1', txt, flags=re.I).split()]))
	if week >= 4:
		txt = txt.replace('th', 'z').replace('Th', 'Z').replace('wr', 'r').replace('Wr', 'R').replace('wh', 'v').replace('Wh', 'V').replace('w', 'v').replace('W', 'V')
	if week >= 5:
		txt = (' ' + txt + ' ').replace('ou', 'u').replace('Ou', 'U').replace('an', 'un').replace('An', 'Un').replace('ing ', 'ink ').replace(' sm', ' schm').replace(' Sm', ' Schm')
	return txt.strip()


import re

def siegfried(week, txt):
	lessons = [[('c(?=[ie])', {'c': 's', 'C': 'S'}), ('c(?!h)', {'c': 'k', 'C': 'K'})], [('ph', {'ph': 'f', 'Ph': 'F'})], [('(?<=\\w\\w\\w)e(?=\\W|\\Z)', {'e': '', 'E': ''}), ('([a-z])\\1', {})], [('th', {'th': 'z', 'Th': 'Z'}), ('wr', {'wr': 'r', 'Wr': 'R'}), ('wh', {'wh': 'v', 'Wh': 'V'}), ('w', {'w': 'v', 'W': 'V'})], [('ou', {'ou': 'u', 'Ou': 'U'}), ('an', {'an': 'un', 'An': 'Un'}), ('ing(?=\\W|\\Z)', {'ing': 'ink'}), ('(?<=\\W)sm|(?<=\\A)sm', {'sm': 'schm', 'Sm': 'Schm'})]]
	result = txt
	for w in range(week):
		for (rx, data) in lessons[w]:
			repl = lambda m: data.get(m.group(0), m.group(0)[0])
			result = re.sub(rx, repl, result, flags=re.IGNORECASE)
	return result


import re

def siegfried(week, txt):
	if week == 1:
		txt = re.sub('ci', matchcase('si'), txt, flags=re.I)
		txt = re.sub('ce', matchcase('se'), txt, flags=re.I)
		txt = re.sub('(?!ch)[c]', matchcase('k'), txt, flags=re.I)
	elif week == 2:
		txt = siegfried(1, txt)
		txt = re.sub('ph', matchcase('f'), txt, flags=re.I)
	elif week == 3:
		txt = siegfried(2, txt)
		txt = re.sub('(?<=\\w{3})e\\b', '', txt)
		txt = re.sub('([a-z])\\1', '\\1', txt, flags=re.I)
	elif week == 4:
		txt = siegfried(3, txt)
		txt = re.sub('th', matchcase('z'), txt, flags=re.I)
		txt = re.sub('wr', matchcase('r'), txt, flags=re.I)
		txt = re.sub('wh|w', matchcase('v'), txt, flags=re.I)
	elif week == 5:
		txt = siegfried(4, txt)
		txt = re.sub('ou', 'u', txt)
		txt = re.sub('an', matchcase('un'), txt, flags=re.I)
		txt = re.sub('ing\\b', matchcase('ink'), txt, flags=re.I)
		txt = re.sub('\\bsm', matchcase('schm'), txt, flags=re.I)
	return txt

def matchcase(word):

	def replace(m):
		text = m.group()
		if text.isupper():
			return word.upper()
		elif text.islower():
			return word.lower()
		elif text[0].isupper():
			return word.capitalize()
		else:
			return word
	return replace


RULES = [['ci si', 'ce se', 'c(?!h) k'], ['ph f'], ['(?<=\\w{3})e+\\b ', '([a-z])\\1 \\1'], ['th z', 'wr r', 'wh v', 'w v'], ['ou u', 'an un', 'ing\\b ink', '\\bsm schm']]

def siegfried(week, txt):
	import re

	def keep_case(repl):

		def wrapper(m):
			ref = re.match('\\\\(\\d)', repl)
			strng = m.group(int(ref.group(1))) if ref else repl
			g = m.group(0)
			if g.islower():
				return strng.lower()
			if g.isupper():
				return strng.upper()
			if g.istitle():
				return strng.title()
			return strng
		return wrapper
	for rules in RULES[:week]:
		for rule in rules:
			(src, repl) = rule.split(' ')
			txt = re.sub(src, keep_case(repl), txt, flags=re.I)
	return txt


import re

def siegfried(week, s):
	d = {'ph': 'f', 'Ph': 'F', 'ci': 'si', 'ce': 'se', 'c': 'k', 'Ci': 'Si', 'Ce': 'Se', 'C': 'K', 'XX': 'ch', 'xx': 'Ch', 'ch': 'XX', 'Ch': 'xx', 'th': 'z', 'wr': 'r', 'wh': 'v', 'w': 'v', 'Th': 'Z', 'Wr': 'R', 'Wh': 'V', 'W': 'V', 'ou': 'u', 'an': 'un', 'ing': 'ink', 'sm': 'schm', 'Ou': 'U', 'An': 'Un', 'Ing': 'Ink', 'Sm': 'Schm'}
	week1 = lambda s: re.sub('(xx)', lambda x: d[x.group()], re.sub('(ci|ce|c)', lambda x: d[x.group()], re.sub('(Ch|ch)', lambda x: d[x.group()], s), flags=re.I), flags=re.I)
	week2 = lambda s: re.sub('ph', lambda x: d[x.group()], s, flags=re.I)
	week3 = lambda s: re.sub('([a-zA-Z])\\1', '\\1', re.sub('\\b([a-zA-Z]+e+)\\b', lambda x: x.group() if len(x.group()) <= 3 else x.group().rstrip('e'), s, flags=re.I), flags=re.I)
	week4 = lambda s: re.sub('(th|wr|wh|w)', lambda x: d[x.group()], s, flags=re.I)
	week5 = lambda s: re.sub('(ing(?= )|(?<= )sm)', lambda x: d[x.group()], re.sub('(ing$|^sm)', lambda x: d[x.group()], re.sub('(ou|an)', lambda x: d[x.group()], s, flags=re.I), flags=re.I), flags=re.I)
	li = [week1, week2, week3, week4, week5]
	for i in li[:week]:
		s = i(s)
	return s


def siegfried(week, txt):
	import re
	dict_week = {1: {'Ci': 'Si', 'Ce': 'Se', 'Ch': 'Xxx', 'C': 'K', 'Xxx': 'Ch', 'ci': 'si', 'ce': 'se', 'ch': 'xxx', 'c': 'k', 'xxx': 'ch'}, 2: {'Ph': 'F', 'ph': 'f'}, 3: {'': ''}, 4: {'Th': 'Z', 'Wr': 'R', 'Wh': 'V', 'W': 'V', 'th': 'z', 'wr': 'r', 'wh': 'v', 'w': 'v'}, 5: {'Ou': 'U', 'An': 'Un', 'ou': 'u', 'an': 'un'}}
	dd = {}
	for i in range(1, week + 1):
		dd.update(dict_week[i])
	for (k, v) in dd.items():
		txt = txt.replace(k, v)
	if week >= 3:
		txt = ''.join((re.sub('e$', '', i) if len(i) > 3 else i for i in re.split('(\\W)', txt)))
		double_l = {re.search('([a-z])\\1', i).group(0) for i in txt.lower().split() if re.search('([a-z])\\1', i)}
		for i in double_l:
			txt = txt.replace(i, i[0])
			txt = txt.replace(i[0].upper() + i[1], i[0].upper())
	if week == 5:
		txt = ' '.join((re.sub('ing$', 'ink', i, flags=re.IGNORECASE) for i in txt.split()))
		txt = ' '.join((re.sub('^sm', 'Schm', i, flags=re.IGNORECASE) for i in txt.split()))
	return txt


import re

def siegfried(week, txt):
	weeks_have_passed = {0: week_one, 1: week_two, 2: week_three, 3: week_four, 4: week_five}
	for counter in range(0, week):
		txt = weeks_have_passed[counter](txt)
	return txt

def week_one(txt):
	letter_list = list(txt)
	copy_reverse_letter_list = letter_list.copy()
	last_letter = ''
	count = -1
	for letter in copy_reverse_letter_list[::-1]:
		lowercase_letter = letter.lower()
		if lowercase_letter == 'c':
			lowercase_letter += last_letter
			if letter.isupper():
				dict_to_know = {'ci': 'S', 'ce': 'S', 'ch': 'C'}
				to_return = 'K'
			else:
				dict_to_know = {'ci': 's', 'ce': 's', 'ch': 'c'}
				to_return = 'k'
			letter_list[count] = dict_to_know.get(lowercase_letter, to_return)
		count -= 1
		last_letter = letter
	final_txt = ''.join(letter_list)
	return final_txt

def week_two(txt):
	letter_list = list(txt)
	copy_letter_list = letter_list.copy()
	copy_letter_list.append('')
	fix_position = 0
	for (counter, letter) in enumerate(copy_letter_list[:-1]):
		lowercase_letter = letter.lower()
		next_letter = copy_letter_list[counter + 1]
		lowcase_next_letter = next_letter.lower()
		if lowercase_letter == 'p' and lowcase_next_letter == 'h':
			counter -= fix_position
			if letter.isupper():
				to_change = 'F'
			else:
				to_change = 'f'
			letter_list[counter:counter + 2] = to_change
			fix_position += 1
	new_txt = ''.join(letter_list)
	return new_txt

def week_three(txt):
	trailling_e = '[a-zA-Z]{3,}e\\b'
	trailling_list = re.findall(trailling_e, txt)
	new_txt = txt
	for trailling_e_word in trailling_list:
		new_txt = new_txt.replace(trailling_e_word, trailling_e_word[:-1])
	letter_list = list(new_txt)
	copy_letter_list = letter_list.copy()
	last_letter = ''
	position = -1
	for letter in copy_letter_list[::-1]:
		lowercase_letter = letter.lower()
		if lowercase_letter == last_letter and lowercase_letter.isalpha():
			del letter_list[position + 1]
			position += 1
		last_letter = lowercase_letter
		position -= 1
	final_txt = ''.join(letter_list)
	return final_txt

def week_four(txt):
	letter_list = list(txt)
	copy_reverse_letter_list = letter_list.copy()
	last_letter = ''
	counter = -1
	for letter in copy_reverse_letter_list[::-1]:
		lowercase_letter = letter.lower()
		if lowercase_letter == 'w' or (lowercase_letter == 't' and last_letter == 'h'):
			lowercase_letter += last_letter
			if letter.isupper():
				dict_to_know = {'wr': 'R', 'wh': 'V', 'th': 'Z'}
				lonely_w = 'V'
			else:
				dict_to_know = {'wr': 'r', 'wh': 'v', 'th': 'z'}
				lonely_w = 'v'
			possible_last_letters = {'h', 'r'}
			if last_letter in possible_last_letters:
				letter_list[counter:counter + 2] = dict_to_know[lowercase_letter]
				counter += 1
			else:
				letter_list[counter] = lonely_w
		counter -= 1
		last_letter = letter
	final_txt = ''.join(letter_list)
	return final_txt

def week_five(txt):
	letter_list = list(txt)
	copy_reverse_letter_list = letter_list.copy()
	last_letter = ''
	counter = -1
	for letter in copy_reverse_letter_list[::-1]:
		lowercase_letter = letter.lower()
		if lowercase_letter == 'o' and last_letter == 'u':
			lowercase_or_uppercase = {'o': 'u', 'O': 'U'}
			letter_list[counter:counter + 2] = lowercase_or_uppercase[letter]
			counter += 1
		elif lowercase_letter == 'a' and last_letter == 'n':
			lowercase_or_uppercase_2 = {'a': 'u', 'A': 'U'}
			letter_list[counter] = lowercase_or_uppercase_2[letter]
		last_letter = lowercase_letter
		counter -= 1
	first_txt = ''.join(letter_list)
	re_to_find_ing = '[a-zA-Z]{1,}ing\\b'
	all_words_ending_with_ing = re.findall(re_to_find_ing, first_txt)
	second_txt = first_txt
	for word in all_words_ending_with_ing:
		new_word = word[:-1] + 'k'
		second_txt = second_txt.replace(word, new_word)
	re_to_find_sm = '\\b[sS][mM][a-zA-Z]*'
	all_words_starting_with_sm = re.findall(re_to_find_sm, second_txt)
	third_txt = second_txt
	for word in all_words_starting_with_sm:
		new_word = word[0] + 'ch' + word[1:]
		third_txt = third_txt.replace(word, new_word)
	final_txt = third_txt
	return final_txt


def siegfried(week, txt):
	symbols = [' ', '.', '!', '-', '\n']
	if week >= 1:
		rules = [['ci', 'si'], ['Ci', 'Si'], ['ce', 'se'], ['Ce', 'Se'], ['ch', '$$'], ['Ch', '$%'], ['c', 'k'], ['C', 'K'], ['$$', 'ch'], ['$%', 'Ch']]
		for translation in rules:
			txt = txt.replace(translation[0], translation[1])
	if week >= 2:
		rules = [['ph', 'f'], ['Ph', 'F']]
		for translation in rules:
			txt = txt.replace(translation[0], translation[1])
	if week >= 3:
		for (position, letter) in enumerate(txt):
			if letter == 'e' and position == len(txt) - 1 and (txt[position - 2] not in symbols) and (txt[position - 3] not in symbols):
				txt = txt[:position] + '$'
			elif letter == 'e' and position not in [0, 1, 2, len(txt) - 1] and (txt[position + 1] in symbols) and (txt[position - 2] not in symbols) and (txt[position - 3] not in symbols):
				txt = txt[:position] + '$' + txt[position + 1:]
		txt = txt.replace('$', '')
		for (position, letter) in enumerate(txt):
			if txt[position].lower() == txt[position - 1].lower() and position != 0 and letter.isalpha() and (letter not in symbols):
				txt = txt[:position] + '$' + txt[position + 1:]
		txt = txt.replace('$', '')
	if week >= 4:
		rules = [['th', 'z'], ['Th', 'Z'], ['wr', 'r'], ['Wr', 'R'], ['wh', 'v'], ['Wh', 'V'], ['w', 'v'], ['W', 'V']]
		for translation in rules:
			txt = txt.replace(translation[0], translation[1])
	if week >= 5:
		rules = [['ou', 'u'], ['Ou', 'U'], ['an', 'un'], ['An', 'Un']]
		for translation in rules:
			txt = txt.replace(translation[0], translation[1])
		for (position, letter) in enumerate(txt):
			if letter == 'i' and position == len(txt) - 3 and (txt[position + 1] == 'n') and (txt[position + 2] == 'g'):
				txt = txt[:position + 2] + '$' + txt[position + 3:]
			elif letter == 'i' and txt[position + 1] == 'n' and (txt[position + 2] == 'g') and (txt[position + 3] in symbols):
				txt = txt[:position + 2] + '$' + txt[position + 3:]
		txt = txt.replace('$', 'k')
		for (position, letter) in enumerate(txt):
			if letter == 'S' and txt[position + 1] == 'm' and (txt[position - 1] in symbols or position == 0):
				txt = txt[:position] + '$$' + txt[position + 2:]
		txt = txt.replace('$$', 'Schm')
	return txt


import re

def siegfried(week, txt):
	w = []
	t = txt.replace('ci', 'si').replace('Ci', 'Si').replace('ce', 'se').replace('Ce', 'Se').replace('c', 'k').replace('C', 'K').replace('kh', 'ch').replace('Kh', 'Ch')
	w.append(t)
	t = t.replace('ph', 'f').replace('Ph', 'F')
	w.append(t)
	t = re.sub('([A-Za-z])\\1', '\\1', re.sub('([a-zA-Z]{3,})e\\b', '\\1', t), flags=re.I)
	w.append(t)
	t = t.replace('th', 'z').replace('Th', 'Z').replace('wr', 'r').replace('Wr', 'R').replace('wh', 'v').replace('Wh', 'V').replace('w', 'v').replace('W', 'V')
	w.append(t)
	t = re.sub('\\b(s|S)(m)', '\\1ch\\2', re.sub('ing\\b', 'ink', t.replace('ou', 'u').replace('an', 'un').replace('An', 'Un')))
	w.append(t)
	return w[week - 1]