Python 101: Introduction to the Python Programming Language

Python 101
Alan Tree 08/24/2011

What is Python?

● Python is a powerful scripting language developed by
Guido van Rossum in the late 80's.
● Python is a fully functional language while maintaining
readability and understandability.
● Python is a common language that ships with most 'nix
distros.
● Python is very extendable
● Python is both dynamically typed and strongly typed at
the same time.

Why Python?

● Readability
● Easy to learn
● Easy to write
● Cross platform
● Powerful
● Extensive uses in many areas of development

Who uses Python?

● Google
● Yahoo
● YouTube
● Industrial Light and Magic
● Disney
● EVE Online
● RackSpace
● AstraZeneca
● HoneyWell

Popular Applications using Python

● Google
● Yahoo
● Blender
● GIMP
● BitTorrent
● Civ 4
● BattleField 2
● Eve Online
● Ubuntu Package Manager

Other uses for Python

1. IT - Various scripting tasks ('nix, OSX, Windows)
2. Web Development (Django, pylons, Grok, TurboGears,
CherryPy, Flask, Google App Engine)
3. Game Development (Panda3d, pyGame, Pyglet, PIL,
Python-Ogre, Soya3d)
4. Desktop Development (GUI development)

IDLE

● Able to modify code and run code directly from editor.
● Code is stored in simple text files with the .py extension.
● No open and close statements or curly braces. Indention
determines blocks of code.
● Comments are achieved with '#'

Strings

s = 'alan'

s = "alan"

s = 'al' + 'an'
>>> 'alan'

s = "%s%s" % ('al', 'an')
>>> 'alan'

Integers

x=2

y=4

z=x+y

z=z/2
>>> 3

Floats

z = 0.1

y = 1.2

m = z+y
>>> 1.3

Dict

t = {}

t = {'name':'alan', 'age':30}

List

l = []

l = ['alan', '30']

l = ['alan', 30, 'apples', {'lname':'tree'}]

Tuple

t = ['alan', 30]

t[1] = 5

Loops

while (condition):
    do this

for i in range (100):
    do this a bunch

peeps_list = ['alan', 'joe', 'frank']
for i in peeps_list:
    print i

Conditionals

if condition:
    do something

if condition:
    do this
else:
    do that

Functions

def my_function():
print "this is my function"
return

my_function()
>>> this is my function

Hello World

print "Hello World"

Hello {Your name here}

your_name = "Alan"

print "Hello %s" % (your_name)

Hello {What is your name?}

your_name = raw_input ("What is your name? : ")

print "Hello %s" % (your_name)

Hello Conditional

your_age = int(raw_input("How old are you? :"))

if your_age >= 30:
print "hmm, getting up there arn't we?"
else:
print "young grass hopper!"

Hello {While Loop}

your_name = ""

while your_name != "Alan":
your_name = raw_input ("What is your name? : ")

print "Access Granted!!!"

Workshop 'Easy'

Hi - Low

Write a program that will:

Guess a random number and have the user try to guess that
random number by providing the clues 'go higher' or
'go lower' depending on the user's guess.

You will need this at the top of your program:
import random

You will need to get your random number like this:
random_number = random.randint(1,10)


Guess a random number and have the user try to guess that
random number by providing the clues 'go higher' or
'go lower' depending on the user's guess.

Hint:
import random
your_guess = 0
random_number = random.randint(1,10)
while {something doesn't match...}:

Workshop 'Easy' Solution:

import random
guess = 0
number = random.randint(1,10)

print "I have chosen a number between 1 and 10. Try to guess it!"

while guess != number :
guess = int(raw_input("Your guess? :"))

if guess < number:
print "go higher"
if guess > number:
print "go lower"

print "You guessed it!"

Workshop 'Advanced'

Fetch Search Results


Fetch the sports located in active search and display a menu
that will allow the user to choose a sport. Once a sport is
selected, have the user provide skills they can use to refine
their search. Once the search is conducted and an item is
found, present a menu so they may see more details about
that event.

Things to note:
You will need these libraries:
import urllib
import json

You will need this base url:
base_url = 'http://api.amp.active.com/search?
f=activities&v=json&api_key=wuhmn9ye94xn3xnteudxsavw'

You will need to url encode the keywords:
url_with_keywords = urllib.quote_plus(key_words)

You will need to parse json:
json.loads(<json_string>)

You will need to use some of this:
"my_string".split("|")
"my_string".strip()

Workshop 'Advanced' HELP 1
import urllib
import json
base_url = 'http://api.amp.active.com/search?
f=activities&v=json&api_key=wuhmn9ye94xn3xnteudxsavw'
sports = ['Baseball', 'Basketball', 'Football', 'Golf', 'Outdoors', 'Running', 'Walking']

for sport in sports:
print "%s - %s" % (sports.index(sport) + int(1), str(sport))

print "n"

the_sport = int(raw_input("What sport would you like to search for?"))
the_keywords = raw_input("Enter any keywords (or press ENTER for now): ")

print "n"

new_url = "%s&m=meta:channel%%3D%s" % (base_url, sports[the_sport])

if the_keywords.strip() != '':
new_url = "%s&k=%s" % (new_url, urllib.quote_plus(the_keywords))
responses = urllib.urlopen(new_url).read()
responses = json.loads(responses)['_results']

Workshop 'Advanced' HELP 2
for i in range(1, len(responses)):
print "%s - %s" % (i, responses[i]['title'].split('|')[0])

more_details = int(raw_input("Choose an event to see more details: "))

result = responses[more_details]
print "n"
print "Title: %s" % (result['title'].split('|')[0])
print "Location: %s, %s" % (result['meta']['city'], result['meta']['state'])
print "Start Date: %s" % (result['meta']['startDate'])
print "Assed ID: %s" % (result['meta']['assetTypeId'])

Python 101: Introduction to the Python Programming Language

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