Code example for http://www.reddit.com/r/learnprogramming/comments/1jv9ev/websites_and_coding/ Super short and sweet web app that takes a user's text and converts it to upper case

upper_web.py

import flask
app = flask.Flask(__name__)

template = """
<form method="POST">
  <textarea name="text"></textarea>
  <input type="submit" value="Submit">
</form>
"""


@app.route('/', methods=['GET', 'POST'])
def make_upper():
  # A POST means the user is sending us information
  if flask.request.method == 'POST':
    # Try to grab 'text' from what the user is sending
    # If they didn't send anything, this defaults to None
    text = flask.request.form.get('text')
    if text:
      # Let's transform the text before returning it
      return text.upper()
    else:
      return "You didn't write any text..."
  # If the user isn't sending us information, let's give them the 'main page'
  # In general you'd use a template, but this is a simple example
  return template

if __name__ == '__main__':
  app.run()