title: formatting content in easygui mesage box and adding scrollbar
body: <p>After this code runs, I would like the results to appear in a message box as separate lines of text, and not as tuples (which is what is happening now). Essentially I would like to see the results in the message box just as they would if I printed the line in pyscripter:</p>
  
  <pre><code>print ext_str+ext,cnt_str,len(sz),max_str,max(sz),min_str,min(sz), avg_str,calc_avg(sz)
  </code></pre>
  
  <p>gives a result that looks like this in the message box (but the lines can wrap):</p>
  
  <p>file type:.mxd count: 5 max. size: 3155968 min. size: 467968 avg. size: 1383014.0
  file type:.3dd count: 1 max. size: 836608 min. size: 836608 avg. size: 836608.0</p>
  
  <p>I would also like to be able to add a vertical scrollbar to the message box, because right now if the contents are too long there is no way to close the dialog. I can't seem to figure out a way to do it with easygui - I know tkinter could be an option but I don't really know it too well. Can these two things be done? Here is my code:</p>
  
  <pre><code>import os, sys, easygui
  from collections import defaultdict
  
  a_dir = easygui.enterbox("Type in directory path:",title='Directory Stats')
  if a_dir is None or a_dir == '' :
    sys.exit()
  else:
    os.chdir(a_dir)
    mydir = os.listdir(os.curdir)
  
  filedict = {}
  ext_str = 'file type:'
  cnt_str = 'count:'
  max_str = 'max. size:'
  min_str = 'min. size:'
  avg_str = 'avg. size:'
  smmry_title = 'Summary of directory contents: '+ a_dir
  stats_lst = []
  
  def calc_avg(num_list):
    return round(sum (num_list) / len(num_list))
  
  for file in mydir:
    fileext = os.path.splitext(file)[1]
    filesz = os.path.getsize(file)
    filedict.setdefault(fileext,[]).append(filesz)
  
  for ext, sz in filedict.items():
    stats = ext_str+ext,cnt_str,len(sz),max_str,max(sz),min_str,min(sz), avg_str,calc_avg(sz)
    stats_lst.append(stats)
    stats_str = '\n'.join(map(str, stats_lst))
  msg = easygui.msgbox(msg=stats_str,title=smmry_title)
  </code></pre>