from flask import Flask
from flask import render_template

app = Flask(__name__)

@app.context_processor
def override_url_for():
    return dict(url_for=dated_url_for)

def dated_url_for(endpoint, **values):
    if endpoint == 'static':
        filename = values.get('filename', None)
        if filename:
            file_path = os.path.join(app.root_path,
                                 endpoint, filename)
            values['q'] = int(os.stat(file_path).st_mtime)
    return url_for(endpoint, **values)

@app.route('/')
def hello_world():
    return 'VVVW'


# @app.route('/hello/<name>')
@app.route('/perspectiveB/')
def perspectiveB():
    return render_template('perspectiveB.html')
@app.route('/perspectiveA/')
def perspectiveA():
    return render_template('perspectiveA.html')
@app.route('/perspectiveC/')
def perspectiveC():
    return render_template('perspectiveC.html')