Python for the Mobile and Web

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Software Development
Python for Mobile and Web
Total: 15 pagesATA/SA-DIP/TUS/Python Mobile and Web.ppt/v1.0
Derek Kiong
dkiong@nus.edu.sg

© 2013 NUS. All rights reserved.ATA/SA-DIP/TUS/Python Mobile and Web.ppt/v1.0 Python for Mobile and Web 2
What is Python?
Small and consistent programming language
Supports multiple programming paradigms –
object-oriented, imperative and functional
Design philosophy emphasizes code
readability – has clear syntax
has comprehensive standard library
latent (dynamic) type system
run-time model similar to Scheme/Lisp

Python Features
Dynamic typing – does not require
declaration
Contrast C and Java which have strong typing
(implemented through compile-time checks)
Dynamic objects with built-in memory
management
Similar with Java and C#
Contrast C and C++
Even function definition is dynamic

Python Language Features
int, float, complex, bool, str, bytes
list, tuple, set, dict
control flow statements, iterator, generator,
exception handling
functions, parameters
class, object, lambda
extensive function/class libraries
kivy and django are Python modules

Python Sample
def factorial(n):
if n > 1:
return n*factorial(n-1)
else:
return 1
def list(n):
for i in range(n):
if i%2 == 0:
print "{0} is even".format(i)
else:
print "{0} is odd".format(i)

Python Sample
def factorial2(n):
result = 1
for i in range(n,0,-1):
result = result*i
return result
def myadd(a,b):
"""
Adds a and b using + operator
"""
return a+b

Android phone/tablet
app = androidhelper.Android()
app.dialogCreateSpinnerProgress("Coffee", "checking...")
app.dialogShow()
pg = urlopen("http://www.beans-r-us.biz/prices.html")
text = pg.read().decode("utf8")
m = re.search(r'>$([.d]+)<',text)
if m:
price = float(m.group(1))
else:
price = 0
app.dialogDismiss()
app.vibrate()

Android phone/tablet
app.dialogCreateAlert("Current price of coffee beans:")
app.dialogSetItems([price])
app.dialogSetPositiveButtonText('OK')
app.dialogShow()
resp = app.dialogGetResponse().result
app.makeToast("Bye!")

Django for the Web
Model-View-Controller (MVC) Web
framework
Object-relational mapping
Generated admin pages
URL driven site
Templating system

Django Model
Model specified in Python
from django.db import models
class Product(models.Model):
code = models.CharField(max_length=8)
description = models.CharField(max_length=22)
price = models.IntegerField()
def __str__(self):
return self.description
class Admin: pass

URL matching
import mysite.inventory.views
urlpatterns = patterns('',
# Examples:
# url(r'^$', 'mysite.views.home', name='home'),
# url(r'^mysite/', include('mysite.foo.urls')),
url(r'^product/?$', mysite.inventory.views.productlisting),
url(r'^product/(.+)$', mysite.inventory.views.product),
)

Views
from mysite.inventory.models import Product
def productlisting(request):
list = Product.objects.all()
t = get_template('productlisting.html')
html = t.render(Context({'products':list}))
return HttpResponse(html)
def product(request, pcode):
p = Product.objects.get(code=pcode)
t = get_template('product.html')
html = t.render(Context({'product':p}))
return HttpResponse(html)

productlisting.html template
<html><body>
<h1>Products</h1>
<ul>
{% for p in products %}
<li>
<a href="/product/{{ p.code }}">
{{ p.code }}
</a>
</li>
{% endfor %}
</ul>
</body></html>

product.html template
<html><body>
<h1>Product Information</h1>
<table border="1" style="solid">
<tr>
<th>Code</th>
<th>Description</th>
<th>Price</th>
</tr>
<tr>
<td> {{ product.code }} </td>
<td> {{ product.description }} </td>
<td> {{ product.price }} </td>
</tr>
</table>
</body></html>

Summary
Python late binding provides much flexibility
http://docs.python.org/2/reference/
QPython in Android
http://qpython.com/
Django for the Web
https://docs.djangoproject.com/en/1.5/

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