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main.py
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main.py
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import os
import cgi
import ast
import sys
import time
import types
import jinja2
import urllib
import timeit
import webapp2
import logging
import datetime
import traceback
import __builtin__
from decimal import Decimal
from itertools import chain
from functools import partial
from cStringIO import StringIO
from collections import defaultdict
from webapp2_extras import json
from google.appengine.ext import ndb
from google.appengine.api import mail
from google.appengine.api import users
from models import Log
from models import Algorithm
JINJA_ENVIRONMENT = jinja2.Environment(
loader = jinja2.FileSystemLoader(os.path.dirname(__file__)),
extensions=['jinja2.ext.autoescape']
)
OWNERS = [
'laffra@gmail.com',
'test@example.com',
]
class LogHandler(webapp2.RequestHandler):
def get(self):
user = users.get_current_user()
if user and user.email() in OWNERS:
days = self.request.get('days') or 1
when = datetime.datetime.utcnow() - datetime.timedelta(days=int(days))
key = ndb.Key('Python Algorithms', 'scrap')
query = Log.query(ancestor=key).filter(Log.date > when).order(-Algorithm.date)
rows = query.fetch(None)
logs = [
(
n,
log.date,
log.msg.split('\n')[0][5:],
'\n'.join(log.msg.strip().split('\n')[1:])
)
for n,log in enumerate(rows)
]
template = JINJA_ENVIRONMENT.get_template('log.html')
self.response.write(template.render(locals()))
else:
template = JINJA_ENVIRONMENT.get_template('login.html')
login = users.create_login_url('/log')
self.response.write(template.render(locals()))
class UsersHandler(webapp2.RequestHandler):
def get(self):
user = users.get_current_user()
if user and user.email() in OWNERS:
key = ndb.Key('Python Algorithms', 'scrap')
query = Log.query(ancestor=key)
if not self.request.get('all'):
query = query.filter(Log.author != user)
rows = query.fetch(None)
names = [log.msg.split('\n')[0][5:] for log in rows ]
names = sorted(set(map(lambda name: name.split(' ')[0], names)))
names = filter(lambda name: '@' in name, names)
self.response.write('%d<p>' % len(names) + '<br>'.join(names))
else:
template = JINJA_ENVIRONMENT.get_template('login.html')
login = users.create_login_url('/users')
self.response.write(template.render(locals()))
class TutorialDashboardHandler(webapp2.RequestHandler):
def get(self):
user = users.get_current_user()
if user and user.email() in OWNERS:
now = datetime.datetime.utcnow()
when = now - datetime.timedelta(days=int(1))
key = ndb.Key('Python Algorithms', 'scrap')
query = Algorithm.query(ancestor=key).filter(Algorithm.date > when).order(Algorithm.date)
def isTutorial(name):
return name and '__temp__' in name and not '%2B' in name and not 'Preview:' in name and not 'Preview%3A' in name
last = {}
for edit in query.fetch(None):
if isTutorial(edit.name):
last['%s_%s' % (edit.name, edit.author.email())] = edit
def time(edit):
seconds = (now - edit.date).seconds
if seconds >= 3600:
return '%dh' % (seconds/ 3600)
elif seconds >= 60:
return '%dm' % (seconds/ 60)
else:
return '%ds' % (1 + seconds)
def recency(edit):
seconds = (now - edit.date).seconds
if seconds >= 3600:
return 'hours'
elif seconds >= 60:
return 'minutes'
else:
return 'seconds'
editMap = defaultdict(list)
for edit in reversed(last.values()):
editMap[ edit.name[8:].replace('+', ' ') ].append(
(
edit.date,
time(edit),
recency(edit),
edit.author.email().split('@')[0],
edit.author.email(),
'show?' + urllib.urlencode({
'name': 'Preview: ' + edit.name[8:].replace('+', ' '),
'share': 'false',
'script': '# Author: %s\n\n%s' % (edit.author, edit.script),
'viz': edit.viz
})
)
)
edits = reversed(sorted(editMap.iteritems(), key=lambda edit: min([e[0] for e in edit[1]])))
when = datetime.datetime.utcnow() - datetime.timedelta(days=int(1))
template = JINJA_ENVIRONMENT.get_template('dashboard.html')
self.response.write(template.render(locals()))
else:
template = JINJA_ENVIRONMENT.get_template('login.html')
login = users.create_login_url('/log')
self.response.write(template.render(locals()))
class CloseHandler(webapp2.RequestHandler):
def get(self):
self.response.headers.add_header("Content-Type", "text/html")
self.response.write(JINJA_ENVIRONMENT.get_template('close.html').render(locals()))
class ShowHandler(webapp2.RequestHandler):
def loadScript(self, name, user=None):
query = Algorithm.query(ancestor=ndb.Key('Python Algorithms', 'scrap')) \
.filter(Algorithm.name == name) \
.order(-Algorithm.date)
algo = None
for algo in query.fetch(None):
if algo.public or not user or algo.author == user:
break
if algo:
logging.info('Load script '+str(algo.date))
return algo.name, algo.script, algo.viz, algo.author
else:
logging.info('No algo found for '+name)
return name, "# Cannot find: '"+name+"'", "", user
def get(self):
edit = self.request.get('edit') == 'true'
tabs = self.request.get('tabs') == 'true'
delay = self.request.get('delay') or '1'
visualize = self.request.get('visualize') == 'true'
script = urllib.unquote(self.request.get('script') or '')
viz = urllib.unquote(self.request.get('viz') or '')
name = self.request.get('name')
url = 'https://pyalgoviz.appspot.com/show?name=%s' % name
user = users.get_current_user()
author = user
if user or visualize:
logout = users.create_logout_url("/")
if name and not script and not viz:
_, script, viz, author = self.loadScript(name, user)
editor_width = 1150 if tabs else 600
editor_height = 640 if tabs else 450
jstabs = "true" if tabs else "false"
html = 'edit_tabs.html' if tabs else 'visualize.html' if visualize else 'edit.html'
template = JINJA_ENVIRONMENT.get_template(html)
html = template.render(locals())
self.response.write(html)
self.response.headers.add_header("Content-Type", "text/html")
logging.info('Response: %d bytes' % len(html))
else:
template = JINJA_ENVIRONMENT.get_template('login.html')
next = '/show?edit=%s&name=%s' % (edit, name)
if visualize:
next = '/close'
login = users.create_login_url(next)
self.response.write(template.render(locals()))
self.response.headers.add_header("Content-Type", "text/html")
class LinkHandler(ShowHandler):
def get(self):
name = self.request.get('name')
user = users.get_current_user()
_, _, _, author = self.loadScript(name, user)
self.response.write(
"<style>body{font-size:25px; font-family:Arial; color:maroon;}</style>" + \
"<b>" + name + "</b> by " + author.email() + \
"<p><a href='/show?tabs=true&name="+name+"'>open with tabs</a> " + \
"<p><a href='/show?name="+name+"'>open regular</a>"
)
class RunHandler(webapp2.RequestHandler):
def post(self):
name = self.request.get('name')
script = self.request.get('script')
viz = self.request.get('viz')
if script == 'none':
algo = Algorithm.query(ancestor=ndb.Key('Python Algorithms', 'scrap')) \
.filter(Algorithm.name == name) \
.filter(Algorithm.public == True) \
.order(-Algorithm.date).get()
if algo:
script = algo.script
viz = algo.viz
result = Executor(
script, viz,
self.request.get('showVizErrors') == 'true',
)
author = users.get_current_user()
info('Ran %s "%s":\n%s' % (author, name, script))
self.response.write(json.encode({
'error': result.error,
'events': result.events,
}))
def loadfile(name):
path = os.path.join(os.path.split(__file__)[0], name)
with open(path) as file:
return file.read().decode('utf-8')
class SourceHandler(webapp2.RequestHandler):
def get(self):
user = users.get_current_user()
if user and user.email() in OWNERS:
name = self.request.get('name') or 'main.py'
files = [
(n, 'sourceLink selected' if n == name else 'sourceLink')
for n in [
'main.py', 'models.py',
'index.html', 'edit.html', 'source.html',
'all.css', 'pyalgoviz.css',
'all.html',
]
]
source = loadfile(name)
source = source.replace('&','&&').replace('<','<')
template = JINJA_ENVIRONMENT.get_template('source.html')
self.response.write(template.render(locals()))
class UpdateHandler(webapp2.RequestHandler):
def post(self):
user = users.get_current_user()
self.response.content_type = 'text/plain'
if user and user.email() in OWNERS:
name = self.request.get('name')
name = 'test.py'
script = self.request.get('script')
try:
path = os.path.join(os.path.split(__file__)[0], name)
with open(path, "w") as file:
file.write(script)
msg = 'Saved source: %s' % name
except Exception as e:
msg = 'Could not save source: %s' % e
self.response.write(msg)
else:
self.response.write('No user?')
class SaveHandler(webapp2.RequestHandler):
def post(self):
author = users.get_current_user()
self.response.content_type = 'application/json'
try:
algo = Algorithm(parent = ndb.Key('Python Algorithms', 'scrap'))
algo.author = author
algo.script = self.request.get('script')
algo.viz = self.request.get('viz')
algo.name = self.request.get('name')
algo.public = False
algo.put()
# notify(author, 'save', algo.name, algo.script, algo.viz)
msg = 'Script was successfully saved by %s as "%s"' % (author.email(), algo.name)
info(msg)
info(algo.script)
except Exception as e:
msg = 'Could not save script: %s' % e
self.response.write(json.encode({'result': msg}))
class LoadHandler(ShowHandler):
def get(self):
name = self.request.get('name').replace(' ', '+')
author = users.get_current_user()
try:
query = Algorithm.query(ancestor=ndb.Key('Python Algorithms', 'scrap')) \
.filter(Algorithm.author == author) \
.filter(Algorithm.name == name) \
.order(Algorithm.date)
self.response.content_type = 'application/json'
for algo in reversed(query.fetch(None)):
self.response.write(json.encode({
'name': name,
'script': algo.script,
'viz': algo.viz
}))
info('loaded "%s", viz=%d bytes, script=%d bytes' % (
name, len(algo.viz), len(algo.script)
))
return
error('Could not load "%s"' % name);
self.response.write(json.encode({
'name': name,
'script': '',
'viz': '',
}))
except Exception as e:
msg = 'Cannot load "%s": %s' % (name,e)
error(msg)
self.response.write(json.encode({
'error': msg
}))
def info(msg):
try:
log = Log(parent = ndb.Key('Python Algorithms', 'scrap'))
log.msg = msg
log.put()
except Exception as e:
pass # print 'Could not log info "%s" due to %s' % (msg, e)
try:
logging.info(msg)
except Exception as e:
pass # print 'Could not log info "%s" due to %s' % (msg, e)
def error(msg):
logging.error(msg)
log = Log(parent = ndb.Key('Python Algorithms', 'scrap'))
log.msg = 'ERROR:' + msg
log.put()
def notify(user, action, name, script, viz):
if user.email() not in OWNERS:
subject = "PyAlgoViz - %s - %s" % (action, name)
body = '%s\n\nhttp://pyalgoviz.appspot.com/show?name=%s\n\nScript:\n%s\n\nVisualization:\n%s' % (
user.email(),
name.replace(' ','%20'),
script,
viz
)
mail.send_mail(user.email(), user.email(), subject, body)
class MainHandler(webapp2.RequestHandler):
def get(self):
template = JINJA_ENVIRONMENT.get_template('index.html')
html = template.render({'algorithms': self.algorithms(), 'user':self.user()})
self.response.headers.add_header("Content-Type", "text/html")
self.response.write(html)
logging.info('Response: %d bytes' % len(html))
def user(self):
return True
def algorithms(self):
return self.load((Algorithm.public == True))
def load(self, filter):
query = Algorithm.query(ancestor=ndb.Key('Python Algorithms', 'scrap')) \
.filter(filter)
def info(pair):
n, algo = pair
return (
algo.name,
algo.author.nickname(),
algo.author.user_id(),
algo.events or '[]',
n,
'not yet shared' if not algo.public else '',
)
algos = reversed(sorted(query.fetch(None), key=lambda algo: algo.date))
algos = map(info, enumerate(algos))
found = set()
result = []
for algo in algos:
if algo[0] not in found:
found.add(algo[0])
result.append(algo)
return sorted(result)
class UserHandler(MainHandler):
def user(self):
return False
def algorithms(self):
author = users.get_current_user()
if author:
return self.load(Algorithm.author == author)
GOOGLE_COLORS = [
"#0140CA", # blue
"#DD1812", # red
"#FCCA03", # orange
"#0140CA", # blue
"#16A61E", # green
"#DD1812", # red
]
HD = False
DEMO_WIDTH = 1920 if HD else 1200
DEMO_HEIGHT = 1080 if HD else 700
DEDICATION_WIDTH = 1720 if HD else 1000
JOKE_WIDTH = 1720 if HD else 1000
DEMO_HTML_CSS = '''
body, html { font-family:Arial; font-size: 25px; margin:0px; color:#777; }
h1 {text-align:center}
#main { width:%s; padding:0px; margin-left:auto; margin-right:auto; }
iframe { overflow: hidden; }
img { margin-top:25px; margin-bottom: 25px; }
.arrow {
border: 1px #aaa solid; padding: 10px;
background: #0140CA; color: white;
text-decoration: none; font-size: 15px;
}
.left { float: left; background: #16A61E; }
.right { float: right; background: #FCCA03; }
.demo_outer { }
.demo { border: 1px #aaa solid; border-width: 1px 0; padding: 10px;
font-size:25px; background:lightyellow;}
.demo button { font-size:22px; color:white; background: #0140CA; }
.dedication { position: relative; z-index: 100; padding:20px 50px;
width: %spx; margin-top: -50px; border: 3px #DD1812 solid; }
.joke { padding:20px 50px; width: %spx; margin: 50px; border: 3px #DD1812 solid; }
.joke pre { font-family: Arial }
.persons { -webkit-column-count: 3; }
.person { text-align: center; }
.person img { margin: 0; }
''' % (DEMO_WIDTH, DEDICATION_WIDTH, JOKE_WIDTH)
DEMO_HTML_HEADER = "<html><head><style>" + loadfile("all.css") + "</style>" + \
"<style>%s</style></head><body><div id=main>" % DEMO_HTML_CSS
DEMO_HTML_FOOTER = loadfile("all.html") + "</div></body></html>"
FRAME_WIDTH = 1920 if HD else 1200
FRAME_HEIGHT = 975 if HD else 700
DEMO_SCRIPT = '''
<script>
var currentDemo = "Xtra%%20-%%20Demos%%20-%%20BubbleSort";
var currentSlide = 1
function demo(demoID) {
document.getElementById(currentDemo).innerHTML =
"<div class=demo>" +
"<b>" + currentDemo.replace(/%%20/g,' ') + "</b>" +
"<p><button name=" + currentDemo + " onclick='demo(this.name)' " +
"tabs=true>LOAD THE DEMO</button> " +
"</div>";
document.getElementById(demoID).innerHTML =
"<iframe width=%s height=%s src=show?tabs=true&name="+demoID+"></iframe>";
currentDemo = demoID;
document.location = "demo#" + demoID;
}
document.addEventListener('onkeydown', function(e) {
var keyCode = e.keyCode;
alert(keyCode)
}, false);
</script>
''' % (FRAME_WIDTH, FRAME_HEIGHT)
DEMO_SLIDES = "http://image.slidesharecdn.com/howigotmyjobatgoogle-140412130045-phpapp02/95/"
DEMO_HELP = '''
<ul>
<li> <b>__lineno__</b>
<li> <b>beep</b>(frequency, milliseconds)
<li> <b>text</b>(x, y, txt, size=13, font='Arial', color='black')
<li> <b>line</b>(x1, y1, x2, y2, color='black', width=1)
<li> <b>rect</b>(x, y, w, h, fill='white', border='black')
<li> <b>circle</b>(x, y, radius, fill='white', border='black')
<li> <b>arc</b>(cx, cy, innerRadius, outerRadius, startAngle, endAngle, color='black')
<li> <b>barchart</b>(x, y, w, h, items, highlight=-1, scale=1, fill='black', border='black')
</ul>
'''
PRINT_LAYOUT = False
class DemoHandler(ShowHandler):
linkCount = 0
def get(self):
self.response.headers.add_header("Content-Type", "text/html")
def label(space=True):
if PRINT_LAYOUT:
return "<hr>"
html = " "
if self.linkCount > 0:
html += arrow("right", "Previous", "#label_%s" % (self.linkCount-1))
html += " "
self.linkCount += 1
if self.linkCount > 1:
html += arrow("left", "Next", "#label_%s" % self.linkCount)
html += "<a name=label_%s></a>" % (self.linkCount)
html += "<br>" * 7 if space else ""
return html
def arrow(clz, text, url):
return "<a class='arrow " + clz + "' href=" + url +">" + text + "</a>"
def h1(value):
return label() + "<h1>%s</h1>" % (value)
def html(value):
return "<div style='width:1280px'>%s</div>" % (value)
def img(src, w=DEMO_WIDTH, h=DEMO_HEIGHT, showLabel=True):
return (label() if showLabel else "") + ("<br>"*3 if self.linkCount>1 else "") + \
"<center><img height=%s width=%s src=%s></center>" % (h,w,src)
def persons(details):
html = "<div class=persons>"
for name, picture, site, w, h in details:
html += "<div class=person>" + img("http://"+picture, w, h, False)
html += "<br>" + link(name,"http://"+site) + "</div>"
return html + "</div>" + "<br>"*7
def joke(text):
return label() + "<p><div class=joke><h1>Joke Time</h1><center><pre>" + text + \
"</pre></center></div>"
def link(text, url, prefix='', postfix=''):
return prefix + "<a target=_blank href=" + url +">" + text + "</a>" + postfix
def algo(name):
id = name.replace(' ', '%20')
return "<a name=" + id +"></a><div id='" + id + "' class=demo_outer><div class=demo>" + \
"<p><button name=" + id + " onclick='demo(this.name)' " + \
"tabs=true>\"" + name +"\"</button> " + \
"</div></div><p>"
self.response.write(''.join([
DEMO_HTML_HEADER,
h1("Fabulous Python Algorithm Visualization"),
html(
"<ul>" + \
"<li>Introduction (2 min)" + \
"<li>Develop a visualization for Bubble Sort (5 min)" + \
"<li>Discuss architecture of PyAlgoViz (8 min)" + \
"<li>Graph Algorithms (10 min)" + \
"<li>Numerical Algorithms (10 min)" + \
"<li>Q&A (10 min)" + \
"</ul><p>"
),
h1("Introduction"),
html("<iframe src='http://pyalgoviz.appspot.com' width='1280' height='680'></iframe>"),
h1("Let's Start with Bubble Sort (5 min)"),
algo("Xtra - Demos - BubbleSort"),
h1("Python Algorithm Visualization Primitives"),
html(DEMO_HELP),
algo("Sorting - BuzzSort"),
h1("The Architecture of PyAlgoViz (8 min)"),
img(DEMO_SLIDES + "slide-4-1024.jpg"), # Pycon poster - browser
img(DEMO_SLIDES + "slide-5-1024.jpg"), # Pycon poster - server
img(DEMO_SLIDES + "slide-6-1024.jpg"), # pseudo code for pyalgoviz
h1("Graph Algorithms (10 min)"),
algo("Graphs - Dijkstra Shortest Path"),
label(False),
algo("Computational Geometry - Convex Hulls"),
label(False),
algo("Graphs - MST"),
label(False),
algo("Searching - BFS"),
label(False),
algo("Searching - DFS"),
label(False),
algo("Trees - AVL"),
h1("Numerical Algorithms (10 min)"),
algo("Geometry - Pi Archimedes"),
label(False),
algo("Geometry - Pi Buffon"),
label(False),
algo("Numbers - Fibonnacci Generator"),
label(False),
algo("Numbers - Fibonacci / Golden Ratio"),
label(False),
algo("Numbers - Mandelbrot Set"),
label(False),
algo("Numbers - Prime Generator"),
h1("Q&A (10 min)"),
"<br>" * 13,
DEMO_SCRIPT,
DEMO_HTML_FOOTER
]))
TUTORIAL_SCRIPT = '''
<script>
setTimeout(function() {
setPage(page, 'block');
labelAlgos();
}, 3000);
function labelAlgos() {
var pageNumbers = {};
var pages = $('.tutpage');
$.each(pages, function(n, page) {
pageNumbers[page.title] = page.getAttribute('n');
});
for (title in pageNumbers) {
var n = pageNumbers[title];
$("li:contains('" + title + "')")
.click(function() { document.location = '/oscon?page=' + this.getAttribute('n'); })
.css('color', 'blue')
.css('cursor', 'pointer')
.css('text-decoration:hover', 'underline')
.attr('n', n)
}
}
function getPage(n) {
return document.getElementById('page-' + n)
}
function setPage(n, display) {
var e = getPage(n);
if (e) {
e.style.display = display;
var progressbar = document.getElementById('progressbar');
var pageCount = $('.tutpage').length;
var pageLink = '<a href="javascript:indexPage()">' + n + '/' + pageCount + '</a>';
$('#progressbar').html('Page ' + pageLink +
' ‐ ' + e.title);
var algo = $('#algo-' + n);
algo.attr('src', (display == 'none') ? '' : algo.attr('url'));
}
return e;
}
function indexPage() {
setPage(page, 'none');
page = 2;
setPage(page, 'block');
history.pushState({}, 'Algorithms For Fun and Profit - ' + page, 'oscon?page=' + page);
}
function nextPage() {
if (getPage(page + 1)) {
setPage(page, 'none');
page++;
setPage(page, 'block');
history.pushState({}, 'Algorithms For Fun and Profit - ' + page, 'oscon?page=' + page);
}
}
function prevPage() {
if (getPage(page - 1)) {
setPage(page, 'none');
page--;
setPage(page, 'block');
history.pushState({}, 'Algorithms For Fun and Profit - ' + page, 'oscon?page=' + page);
}
}
function getURLParameter(name, defaultValue) {
return decodeURIComponent(
(new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search)||[,""])[1].replace(/\+/g, '%20'))||defaultValue
}
var page = parseInt(getURLParameter('page', 1));
setPage(page, 'block');
</script>
'''
TUTORIAL_HTML_CSS = '''
body, html { font-family:Arial; font-size: 25px; margin:0px; color:#777; }
h1,h2,h3 {100px; text-align:center;}
.shadowText { text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black; }
table {margin-left: 100px;}
td {margin:10px; padding-top:25px; border:1px solid #CCC;}
#main { width:1280px; padding:0px; margin-left:auto; margin-right:auto; }
iframe { overflow: hidden; }
.hover { position: absolute; right:68px; top:15px; color:white;}
img { }
.arrow {
border: 1px #aaa solid; padding: 10px;
background: #0140CA; color: white;
text-decoration: none; font-size: 15px;
}
.next { float: right; margin-right: -4px; width:80px; background: #16A61E; text-align:center;}
.previous { float: left; width:80px; background: #FCCA03; text-align:center;}
#progressbar { width:1075; float:left; text-align: center; padding-top:7px;}
.demo_outer { }
#clock { margin: 100px -100px; }
center { width:1280; }
.algo { width:1280; height:1000px; }
.demo button { font-size:22px; color:white; background: #0140CA; }
.persons { -webkit-column-count: 3; }
.person { text-align: center; }
.person img { margin: 0; }
.header { float: left; width:1280px; }
.tutpage { float: left; width:1280px; display: none; }
a { color: #777; }
'''
TUTORIAL_HTML_HEADER = "<html><head><style>" + loadfile("all.css") + "</style>" + \
"<style>%s</style></head><body><div id=main>" % TUTORIAL_HTML_CSS
#########################################################################
TUTORIAL_BUBBLESORT = [
"BubbleSort",
'''
def bubbleSort(L):
for i in range(len(L) - 1, 0, -1):
for j in xrange(i):
if L[j] > L[j+1]:
L[j],L[j+1] = L[j+1],L[j]
from random import sample
data = sample(range(10), 10)
print 'before:', data, sorted(data) == data
bubbleSort(data)
print 'after: ', data, sorted(data) == data
''',
'''
# This is our visualization plan:
#
# 1. play some sound
# 2. show the current value of "data"
# 3. show each value as a rect to make a bargraph
# 4. make the graph bottom-oriented
# 5. show current values of "i" and "j" by coloring bars
# 6. use builtin barchart
# 7. show marker to show if algorithm is correct
'''
]
TUTORIAL_QUICKSORT = [
"QuickSort",
'''
print "World"
''',
'''
print "Hello"
'''
]
#########################################################################
TUTORIAL_FIZZBUZZ = [
"FizzBuzz",
'''
def fizzbuzz(numbers):
result = []
for number in numbers:
result.append('fizzbuzz')
result.append('fizz')
result.append('buzz')
result.append(number)
return result
expected = [
1, 2, 'fizz', 4, 'buzz',
'fizz', 7, 8, 'fizz', 'buzz',
11, 'fizz', 13, 14, 'fizzbuzz'
]
assert fizzbuzz(range(1, 16)) == expected, 'Fizzbuzz Failed'
''',
'''
for n in numbers:
text(50, 25 + n*25, n, 20)
colors = {
'fizz': 'green',
'buzz': 'blue',
'fizzbuzz': 'red',
}
for n,value in enumerate(expected):
color = colors.get(value, 'black')
text(150, (n+2)*25, value, 20, color=color)
for n,value in enumerate(result):
color = colors.get(value, 'black')
text(250, (n+2)*25, value, 20, color=color)
text(50, 12, 'numbers')
text(150, 12, 'expected')
text(250, 12, 'result')
text(400, 160, 'YOU', 35)
text(400, 200, 'PASSED' if result==expected else 'FAILED', 35)
text(400, 240, 'THE', 35)
text(400, 280, 'INTERVIEW', 35)
'''
]
#########################################################################
TUTORIAL_KNUTH_SHUFFLE = [
"Knuth Shuffle",
'''
import random
LEN = 10
original = range(LEN)
shuffled = []
for i in range(LEN):
index = random.randrange(0, LEN-i)
value = original[index]
del original[index]
shuffled.append(value)
''',
'''
X, Y1, Y2, D = 50, 120, 270, 40
text(20, Y1-20, 'Original list', 25)
for n,value in enumerate(original):
color = 'red' if n==index else 'green' if n==i else 'white'
rect(X+n*D, Y1+0*D, D-5, D-5, color)
text(X+n*D+2, Y1+0*D+D/2, value, 15)
text(20, Y2-20, 'Shuffled List', 25)
for n,value in enumerate(shuffled):
rect(X+n*D, Y2+0*D, D-5, D-5)
text(X+n*D+2, Y2+0*D+D/2, value, 15)
'''
]
#########################################################################
TUTORIAL_ANAGRAM_CHECK = [
"Anagram Check",
'''
def is_anagram(s1, s2):
#
# s1 and s2 are an anagram if they consist
# of the same rearranged characters
#
# fix the code below
#
return len(s1) == len(s2)
def unit_tests():
samples = [
('secure', 'rescue', True),
('google', 'googol', False),
('conifer', 'fircone', True),
('ronald', 'donald', False),
]
for s1,s2,expected in samples:
anagram = is_anagram(s1, s2)
print 'Test:', s1, s2
assert anagram == expected, 'is_anagram is broken'
unit_tests()
''',
'''
label = 'OK' if anagram == expected else 'FAIL'
color = 'green' if anagram == expected else 'red'
text(30, 320, label, 20, 'Arial', color)
def show(s, y, label):
text(30, y+20, label, 20, 'Arial', 'teal')
text(100, y+20, list(s), 20, 'Arial', 'teal')
text(300, y+20, sorted(s), 20, 'Arial', 'blue')
show(s1, 100, 's1:')
show(s2, 200, 's2:')
'''
]
#########################################################################
TUTORIAL_PALINDROME_CHECK = [
"Palindrome Check",
'''
def palindrome(s):
#
# Given a string, check if it is a palindrome.
#
return s == s[::-1]
strings = [
'acdc',
'kayak',
'deadmau5',
'abba',
]
for s in strings:
print '%s: %s' % (repr(s), palindrome(s))
''',
'''
def show(s, y, color, label):
text(30, y+20, label, 20, 'Arial', color)
for n,c in enumerate(s):
rect(150+n*30, y, 25, 25)
text(155+n*30, y+20, c, 20, 'Arial', color)
if s == s[::-1]:
color = 'teal'
line(40, 300, 50, 325, color, 5)
line(50, 325, 90, 275, color, 5)
else:
color = 'red'
line(40, 275, 90, 325, color, 5)
line(40, 325, 90, 275, color, 5)
show(s, 100, color, 'original:')
show(s[::-1], 200, color, 'reversed:')
'''
]
#########################################################################
TUTORIAL_PRIME_NUMBERS = [
"Prime Numbers",
'''
def isPrime(number):
# this is a slow form of trial division, we can do better
for k in range(2, number):
if number % k == 0:
return False
return True
def getPrimes(count=50):
for n in xrange(2, count+1):
if isPrime(n):
yield n
primes = []
for p in getPrimes():
primes.append(p)
expected = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47]
assert primes == expected, 'Assert error: isPrime is broken...'
''',
'''
X, Y, D = 50, 100, 40
text(X, 355, 'n = %d, k = %d' % (n, k), 30)
if n in primes:
text(X, 405, '%d is prime' % n, 30)
for number in range(1, n+1):
color = 'pink' if number in primes else 'lightyellow'
if number == k:
color = 'red'
y = (number - 1) / 10
x = (number - 1) % 10
rect(X+x*D, Y+y*D, D-5, D-5, color)
text(X+x*D+2, Y+y*D+D/2, number, 15)
rect(X, 22, 395, 40, '#333')
text(X+30, 52, 'Prime Number Generator', 30, color='lightblue')
'''
]
#########################################################################