title: TypeError: sequence item 1: expected a bytes-like object, str found
body: <p>I am trying to extract English titles from a wiki titles dump that's in a text file using regex in Python 3. The wiki dump contains titles in other languages also and some symbols. Below is my code:</p>
  
  <pre><code>with open('/Users/some/directory/title.txt', 'rb')as f:
      text=f.read()
      letters_only = re.sub(b"[^a-zA-Z]", " ", text)
      words = letters_only.lower().split() 
  print(words)
  </code></pre>
  
  <p>But I am getting an error:</p>
  
  <pre><code>TypeError: sequence item 1: expected a bytes-like object, str found 
  </code></pre>
  
  <p>at the line: <code>letters_only = re.sub(b"[^a-zA-Z]", " ", text)</code></p>
  
  <p>But, I am using <code>b''</code> to make output as byte type, below is a sample of the text file:</p>
  
  <pre><code>Destroy-Oh-Boy!!
  !!Que_Corra_La_Voz!!
  !!_(chess)
  !!_(disambiguation)
  !'O!Kung
  !'O!Kung_language
  !'O-!khung_language
  !337$P34K
  !=
  !?
  !?!
  !?Revolution!?
  !?_(chess)
  !A_Luchar!
  !Action_Pact!
  !Action_pact!
  !Adios_Amigos!
  !Alabadle!
  !Alarma!
  !Alarma!_(album)
  !Alarma!_(disambiguation)
  !Alarma!_(magazine)
  !Alarma!_Records
  !Alarma!_magazine
  !Alfaro_Vive,_Carajo!
  !All-Time_Quarterback!
  !All-Time_Quarterback!_(EP)
  !All-Time_Quarterback!_(album)
  !Alla_tu!
  !Amigos!
  !Amigos!_(Arrested_Development_episode)
  !Arriba!_La_Pachanga
  !Ask_a_Mexican!
  !Atame!
  !Ay,_Carmela!_(film)
  !Ay,_caramba!
  !BANG!
  !Bang!
  !Bang!_TV
  !Basta_Ya!
  !Bastardos!
  !Bastardos!_(album)
  !Bastardos_en_Vivo!
  !Bienvenido,_Mr._Marshall!
  !Ciauetistico!
  !Ciautistico!
  !DOCTYPE
  !Dame!_!Dame!_!Dame!
  !Decapitacion!
  !Dos!
  !Explora!_Science_Center_and_Children's_Museum
  !F
  !Forward,_Russia!
  !Forward_Russia!
  !Ga!ne_language
  !Ga!nge_language
  !Gã!ne
  !Gã!ne_language
  !Gã!nge_language
  !HERO
  !Happy_Birthday_Guadaloupe!
  !Happy_Birthday_Guadalupe!
  !Hello_Friends
  </code></pre>
  
  <p>I have searched online but could not succeed. Any help will be appreciated.</p>