from flask import Flask, render_template
import math
import random
app = Flask(__name__)
  
@app.route('/')
def welcome():
    return '''<h1>Welcome</h1>'''
 
@app.route('/square/<int:n>')
def square(n):
    return('<p>{x}<sup>2</sup> is {x2}</p>'.format(x=n,x2=n*n))
 
@app.route('/sqrt/<float:n>')
def sqrt(n):
    return ('<p>{x} is the square root of {y}'
            .format(x=math.sqrt(abs(n)),y=n))
             
@app.route('/country/<city>')
def country(city):
    known = {'Paris':'France',
             'London':'England',
             'Madrid':'Spain',
             'Beijing':'China'}
    if city in known:
        return ('<p>{city} is the capital of {country}'
                .format(city=city,country=known[city]))
    else:
        return ('''<p>I don't know the country whose capital is {city}'''
                .format(city=city))
 
     
if __name__ == '__main__':
    import os
    uid = os.getuid()
    app.debug = True
    app.run('0.0.0.0',uid)