text: # -*- coding: utf-8 -*-
  import re
  caps = "([A-Z])"
  prefixes = "(Mr|St|Mrs|Ms|Dr)[.]"
  suffixes = "(Inc|Ltd|Jr|Sr|Co)"
  starters = "(Mr|Mrs|Ms|Dr|He\s|She\s|It\s|They\s|Their\s|Our\s|We\s|But\s|However\s|That\s|This\s|Wherever)"
  acronyms = "([A-Z][.][A-Z][.](?:[A-Z][.])?)"
  websites = "[.](com|net|org|io|gov)"
  
  def split_into_sentences(text):
      text = " " + text + "  "
      text = text.replace("\n"," ")
      text = re.sub(prefixes,"\\1<prd>",text)
      text = re.sub(websites,"<prd>\\1",text)
      if "Ph.D" in text: text = text.replace("Ph.D.","Ph<prd>D<prd>")
      text = re.sub("\s" + caps + "[.] "," \\1<prd> ",text)
      text = re.sub(acronyms+" "+starters,"\\1<stop> \\2",text)
      text = re.sub(caps + "[.]" + caps + "[.]" + caps + "[.]","\\1<prd>\\2<prd>\\3<prd>",text)
      text = re.sub(caps + "[.]" + caps + "[.]","\\1<prd>\\2<prd>",text)
      text = re.sub(" "+suffixes+"[.] "+starters," \\1<stop> \\2",text)
      text = re.sub(" "+suffixes+"[.]"," \\1<prd>",text)
      text = re.sub(" " + caps + "[.]"," \\1<prd>",text)
      if "”" in text: text = text.replace(".”","”.")
      if "\"" in text: text = text.replace(".\"","\".")
      if "!" in text: text = text.replace("!\"","\"!")
      if "?" in text: text = text.replace("?\"","\"?")
      text = text.replace(".",".<stop>")
      text = text.replace("?","?<stop>")
      text = text.replace("!","!<stop>")
      text = text.replace("<prd>",".")
      sentences = text.split("<stop>")
      sentences = sentences[:-1]
      sentences = [s.strip() for s in sentences]
      return sentences
  
  def clean(text):
      return text.replace('.','').replace('?','').replace('!','').lower()