title: Count how many times each letter appears in a text sample
body: <p>I need a function that counts how many times each individual letter appears in a string. It has to count capitals and lowercase as the same letter. I sort of did it, but its not exactly pretty.</p>
  
  <pre><code>def lmao(x):
  
      aye=x.count("a")
      Aye=x.count("A")
      bye=x.count("b")
      Bye=x.count("B")
      cye=x.count("c")
      Cye=x.count("C")
      dye=x.count("d")
      Dye=x.count("D")
      Eye=x.count("E")
      eye=x.count("e")
      Fye=x.count("F")
      fye=x.count("f")
      Gye=x.count("G")
      gye=x.count("g")
      Hye=x.count("H")
      hye=x.count("h")
      Iye=x.count("I")
      iye=x.count("i")
      Jye=x.count("J")
      jye=x.count("j")
      Kye=x.count("K")
      kye=x.count("k")
      Lye=x.count("L")
      lye=x.count("l")
      Mye=x.count("M")
      mye=x.count("m")
      Nye=x.count("N")
      nye=x.count("n")
      Oye=x.count("O")
      oye=x.count("o")
      Pye=x.count("P")
      pye=x.count("P")
      Qye=x.count("Q")
      qye=x.count("q")
      rye=x.count("r")
      Rye=x.count("R")
      sye=x.count("s")
      Sye=x.count("S")
      tye=x.count("t")
      Tye=x.count("T")
      uye=x.count("u")
      Uye=x.count("U")
      Vye=x.count("V")
      vye=x.count("v")
      Wye=x.count("W")
      wye=x.count("w")
      Xye=x.count("X")
      xye=x.count("x")
      Yye=x.count("Y")
      yye=x.count("y")
      Zye=x.count("Z")
      zye=x.count("z")
      killme=(aye+Aye,bye+Bye,cye+Cye,Dye+dye,Eye+eye,Fye+fye,Gye+gye,Hye+hye,Iye+iye,jye+Jye,Kye+kye,Lye+lye,Mye+mye,Nye+nye,Oye+oye,Pye+pye,Qye+qye,rye+Rye,sye+Sye,Tye+tye,uye+Uye,Vye+vye,Wye+wye,xye+Xye,Yye+yye,Zye+zye)
      return killme
  </code></pre>
  
  <p>So yeah, thats the disaster that I came up with. Is there any way to shorten this process?</p>