1. Scott G. Ainsworth for ODU ACM 22 Sept 2011
Python
Scott G. Ainsworth for ODU ACM 22 Sept 2011

2. What is Python? Easy to learn Simple syntax Dynamic typing
High-level data structures
Free
Linux/Unix, OS X, Windows
MIT’s language of choice
Relationship to other languages

3. Why Python? Fast development cycle
Interactive & edit, debug/run
vs. edit, compile, debug/run
Extensive standard and add-on libraries
(MIT’s language of choice)
Python, Jython, & IronPython
Google AppEngine

4. Basic Syntax Block structured But no braces Indent defines blocks
def fib(n):
a, b = 0, 1
while b < n:
print b,
a, b = b, a+b
Quick introduction to the syntax

5. Numbers & Strings Integers: -231 – 231-1 5 + 23 Long: unlimited
Boolean:
True or False 0 or 1
Real and Complex:
1.25 / 6.3
Complex(1.1,2.2)
'value' == "value"
"""multiple lines"""
u'unicode'
'substring'[2:5] == 'bst'

6. Sequence Types Lists Tuples
primes = [ 2, 3, 5, 7, 11, 13, 17, 19, 23 ]
primes.append(27)
Primes[-2:] = [ 23, 27 ]
Tuples
primes = ( 2, 3, 5, 7, 11, 13, 17,19, 23 )
primes.append(27) # fails, tuples are immutable
primes[-2:] = ( 23, 27 )
Strings are an immutable list of single characters
Lists, tuples, dictionaries, & strings

7. Dictionaries & Sets Dictionaries Sets
pdict = { "p1" : 2, "p2" : 3, "p3" : 5 }
pdict["p4"] = 7
pdict["p2"] == 3
Sets
primes = Set([ 2, 3, 5, 7, 11, 13, 17,19, 23 ])
primes.append(27) # fails, set are unordered
primes.add(27) # succeeds
Lists, tuples, dictionaries, & strings

8. Classes
Class complex: """implement complex numbers""" def __init__(self, r, i): self.__r = r self.__i = i def isreal(self): return self.c == def __add__(self, c): return complex(self.r + c.r, self.i + c.i)

9. Memento & Timemap for www.cs.odu.edu
< rel="original",
< rel="timemap"; type="application/link-format”,
< rel="first memento"; datetime="Thu, 02 Jan :01:37 GMT”,
< >; rel="memento"; datetime="Fri, 06 Jun :50:39 GMT",
Output from timemap.py test
Original:
Time Map:
First Memento: (datetime.datetime(1997, 1, 2, 13, 1, 37, tzinfo=tzutc()), '
:50:39+00:00 =

10. timemap.py Output
Original: Time Bundle: Time Gate: Time Map: First Memento: :01:37+00:00 Last Memento: :58:31+00:00 Mementos: :50:39+00:00 = / :16:32+00:00 = /

11. Code Walk Through class TimeMap: Memento timemap container class
class TimeMapTokenizer: Helper class to tokenize a link-style timemap
__main__: Used for quick unit testing
Download the code:

12. Summary Easy to learn Dynamic typing High-level data structures Free
Linux/Unix, OS X, Windows
Fast development cycle
Extensive standard and add-on libraries
Widely-supported
Relationship to other languages

13. Questions? ?

14. Links
Slides:
Code:
Python:
Python Docs:
Python Libraries: