The document provides an introduction to Python programming, highlighting its features such as being multi-platform, dynamically typed, and having a large standard library. It includes examples of the Python interpreter, functions, modules, packages, and classes, demonstrating how to create and use them. Additionally, it mentions notable organizations using Python and offers resources for further learning.

1. Welcome to MEMpy
Brad Montgomery
http://mempy.org

2. print('hello world')

3. Python
• multi-platform
• multi-paradigm
• dynamically-typed
• big standard lib (tons of 3rd party libs)
• open source
• by Guido van Rossum (BDFL)

4. the interpreter
• An interactive Python shell
• In a *nix environment, open a terminal and
type: python
• In Windows, run IDLE

5. IDLE

6. the interpreter
>>> print('hello world')
hello world
>>> 31 + 11
42
>>>

7. functions
# save this in a file named "greeting.py"
def hello(input_name='world'):
greeting = "Hello {name}".format(
name=input_name)
return greeting
>>> from greeting import hello
>>>
>>> hello()
'Hello world'
>>>
>>> hello("Universe")
'Hello Universe'

8. modules/packages
• namespaces!
• module: a file with python code:
greeting.py
• package: a directory of python modules

9. modules/packages
>>> from greetingapp import greeting
>>>
>>> greeting.hello()
'Hello world'
>>>
>>> greeting.hello("Universe")
'Hello Universe'

10. classes
class Greeter(object):
names = ['World' ]
def hello(self, names=None):
if names:
self.names = names
for name in self.names:
s = 'Hello {n}'.format(n=name)
print(s)

11. classes
>>> from greeting import Greeter
>>> g = Greeter()
>>> g.hello()
Hello World
>>> g.hello(['Bill', 'Betty'])
Hello Bill
Hello Betty
>>>

12. who’s using python?
• Google • EDU’s
• YouTube • CERN
• Nasa • ESRI
• Astra-Zeneca • CCP Games
• Lucasfilm • Silicon Valley Startups
• Reddit • Hobbyists

13. learn more
• http://learnpythonthehardway.org/
• http://openbookproject.net/thinkCSpy/
• http://docs.python.org/tutorial/