old_contents: #!/usr/bin/env python
  import os
  from flask import Flask, render_template
  
  app = Flask(__name__)
  
  @app.route('/')
  def root():
  	genres = ('Hip Hop', 'Electronic', 'R&B')
  	songs = [\
  			{ 'rank':'1', 'title':'The Motto', 'artist':'Drake', 'year':'2013', 'genre':'Rap' },\
  			{ 'rank':'2', 'title':'Started from the Bottom', 'artist':'Drake', 'year':'2012', 'genre':'Hip Hop' },\
  			{ 'rank':'3', 'title':'Thrift Shop', 'artist':'Macklemore', 'year':'2013', 'genre':'House' }\
  			]
  	return render_template('index.html', genres=genres, genre=genres[0], songs=songs)
  
  if __name__ == "__main__":
  	# Bind to PORT if defined, otherwise default to 5000.
  	port = int(os.environ.get('PORT', 5000))
  	app.run(host='0.0.0.0', port=port)
  
new_contents: #!/usr/bin/env python
  import os
  from flask import Flask, render_template, request, redirect, url_for
  
  app = Flask(__name__)
  genres = ('Hip Hop', 'Electronic', 'R&B')
  songs = [\
  		{ 'rank':'1', 'title':'The Motto', 'artist':'Drake', 'year':'2013', 'genre':'Hip Hop' },\
  		{ 'rank':'2', 'title':'Started from the Bottom', 'artist':'Drake', 'year':'2012', 'genre':'Hip Hop' },\
  		{ 'rank':'3', 'title':'Thrift Shop', 'artist':'Macklemore', 'year':'2013', 'genre':'Electronic' }\
  		]
  
  @app.route('/')
  def index():
  	return render_template('index.html', genres=genres, genre=genres[0], songs=songs)
  
  @app.route('/submit')
  def submit():
  	title = request.args.get('Song Title')
  	artist = request.args.get('Artist')
  	year = request.args.get('Year')
  	genre = request.args.get('Genre')
  	songs.append({ 'rank':str(len(songs) + 1), 'title':title, 'artist':artist, 'year':year, 'genre':genre })
  	return redirect(url_for('index'))
  
  if __name__ == "__main__":
  	# Bind to PORT if defined, otherwise default to 5000.
  	port = int(os.environ.get('PORT', 5000))
  	app.run(host='0.0.0.0', port=port)
  
subject: Enable submission of new songs via form.