Submit Search
Upload
intro22.ppt
•
Download as PPT, PDF
•
0 likes
•
3 views
U
UjjwalKumarSingh23
Follow
This I a ppt for python
Read less
Read more
Education
Report
Share
Report
Share
1 of 42
Download now
Recommended
Intro22
Intro22
Sachin Ghalme
Introduction to phyton
Introduction to phyton
Ricardo Milla
python within 50 page .ppt
python within 50 page .ppt
sushil155005
Introduction to Python
Introduction to Python
UC San Diego
Elixir and OTP Apps introduction
Elixir and OTP Apps introduction
Gonzalo Gabriel Jiménez Fuentes
Python于Web 2.0网站的应用 - QCon Beijing 2010
Python于Web 2.0网站的应用 - QCon Beijing 2010
Qiangning Hong
Python basics
Python basics
PrafullaKamble3
OOC in python.ppt
OOC in python.ppt
SarathKumarK16
Recommended
Intro22
Intro22
Sachin Ghalme
Introduction to phyton
Introduction to phyton
Ricardo Milla
python within 50 page .ppt
python within 50 page .ppt
sushil155005
Introduction to Python
Introduction to Python
UC San Diego
Elixir and OTP Apps introduction
Elixir and OTP Apps introduction
Gonzalo Gabriel Jiménez Fuentes
Python于Web 2.0网站的应用 - QCon Beijing 2010
Python于Web 2.0网站的应用 - QCon Beijing 2010
Qiangning Hong
Python basics
Python basics
PrafullaKamble3
OOC in python.ppt
OOC in python.ppt
SarathKumarK16
08-classes-objects.ppt
08-classes-objects.ppt
ssuser419267
08-classes-objects.ppt
08-classes-objects.ppt
UmooraMinhaji
Python tutorialfeb152012
Python tutorialfeb152012
Shani729
python.ppt
python.ppt
MayankRai689616
Python advanced 3.the python std lib by example – system related modules
Python advanced 3.the python std lib by example – system related modules
John(Qiang) Zhang
Introducción a Elixir
Introducción a Elixir
Svet Ivantchev
A Few of My Favorite (Python) Things
A Few of My Favorite (Python) Things
Michael Pirnat
sonam Kumari python.ppt
sonam Kumari python.ppt
ssuserd64918
Intro to Python
Intro to Python
OSU Open Source Lab
JavaScript in 2016 (Codemotion Rome)
JavaScript in 2016 (Codemotion Rome)
Eduard Tomàs
JavaScript in 2016
JavaScript in 2016
Codemotion
Ruby 2: some new things
Ruby 2: some new things
David Black
Non-local Neural Network
Non-local Neural Network
Hiroshi Fukui
Zend Framework 1 + Doctrine 2
Zend Framework 1 + Doctrine 2
Ralph Schindler
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Mozaic Works
python.ppt
python.ppt
ramamoorthi24
Continuous Delivery Workshop with Ansible x GitLab CI (2nd+)
Continuous Delivery Workshop with Ansible x GitLab CI (2nd+)
Chu-Siang Lai
python chapter 1
python chapter 1
Raghu nath
Python chapter 2
Python chapter 2
Raghu nath
python.ppt
python.ppt
MukundSharma74
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
fonyou31
The Most Excellent Way | 1 Corinthians 13
The Most Excellent Way | 1 Corinthians 13
Steve Thomason
More Related Content
Similar to intro22.ppt
08-classes-objects.ppt
08-classes-objects.ppt
ssuser419267
08-classes-objects.ppt
08-classes-objects.ppt
UmooraMinhaji
Python tutorialfeb152012
Python tutorialfeb152012
Shani729
python.ppt
python.ppt
MayankRai689616
Python advanced 3.the python std lib by example – system related modules
Python advanced 3.the python std lib by example – system related modules
John(Qiang) Zhang
Introducción a Elixir
Introducción a Elixir
Svet Ivantchev
A Few of My Favorite (Python) Things
A Few of My Favorite (Python) Things
Michael Pirnat
sonam Kumari python.ppt
sonam Kumari python.ppt
ssuserd64918
Intro to Python
Intro to Python
OSU Open Source Lab
JavaScript in 2016 (Codemotion Rome)
JavaScript in 2016 (Codemotion Rome)
Eduard Tomàs
JavaScript in 2016
JavaScript in 2016
Codemotion
Ruby 2: some new things
Ruby 2: some new things
David Black
Non-local Neural Network
Non-local Neural Network
Hiroshi Fukui
Zend Framework 1 + Doctrine 2
Zend Framework 1 + Doctrine 2
Ralph Schindler
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Mozaic Works
python.ppt
python.ppt
ramamoorthi24
Continuous Delivery Workshop with Ansible x GitLab CI (2nd+)
Continuous Delivery Workshop with Ansible x GitLab CI (2nd+)
Chu-Siang Lai
python chapter 1
python chapter 1
Raghu nath
Python chapter 2
Python chapter 2
Raghu nath
python.ppt
python.ppt
MukundSharma74
Similar to intro22.ppt
(20)
08-classes-objects.ppt
08-classes-objects.ppt
08-classes-objects.ppt
08-classes-objects.ppt
Python tutorialfeb152012
Python tutorialfeb152012
python.ppt
python.ppt
Python advanced 3.the python std lib by example – system related modules
Python advanced 3.the python std lib by example – system related modules
Introducción a Elixir
Introducción a Elixir
A Few of My Favorite (Python) Things
A Few of My Favorite (Python) Things
sonam Kumari python.ppt
sonam Kumari python.ppt
Intro to Python
Intro to Python
JavaScript in 2016 (Codemotion Rome)
JavaScript in 2016 (Codemotion Rome)
JavaScript in 2016
JavaScript in 2016
Ruby 2: some new things
Ruby 2: some new things
Non-local Neural Network
Non-local Neural Network
Zend Framework 1 + Doctrine 2
Zend Framework 1 + Doctrine 2
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
Stefan Kanev: Clojure, ClojureScript and Why They're Awesome at I T.A.K.E. Un...
python.ppt
python.ppt
Continuous Delivery Workshop with Ansible x GitLab CI (2nd+)
Continuous Delivery Workshop with Ansible x GitLab CI (2nd+)
python chapter 1
python chapter 1
Python chapter 2
Python chapter 2
python.ppt
python.ppt
Recently uploaded
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
fonyou31
The Most Excellent Way | 1 Corinthians 13
The Most Excellent Way | 1 Corinthians 13
Steve Thomason
Measures of Central Tendency: Mean, Median and Mode
Measures of Central Tendency: Mean, Median and Mode
Thiyagu K
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
EduSkills OECD
Key note speaker Neum_Admir Softic_ENG.pdf
Key note speaker Neum_Admir Softic_ENG.pdf
Admir Softic
Activity 01 - Artificial Culture (1).pdf
Activity 01 - Artificial Culture (1).pdf
ciinovamais
Unit-IV- Pharma. Marketing Channels.pptx
Unit-IV- Pharma. Marketing Channels.pptx
VishalSingh1417
Student login on Anyboli platform.helpin
Student login on Anyboli platform.helpin
RaunakKeshri1
Measures of Dispersion and Variability: Range, QD, AD and SD
Measures of Dispersion and Variability: Range, QD, AD and SD
Thiyagu K
APM Welcome, APM North West Network Conference, Synergies Across Sectors
APM Welcome, APM North West Network Conference, Synergies Across Sectors
Association for Project Management
IGNOU MSCCFT and PGDCFT Exam Question Pattern: MCFT003 Counselling and Family...
IGNOU MSCCFT and PGDCFT Exam Question Pattern: MCFT003 Counselling and Family...
PsychoTech Services
The basics of sentences session 2pptx copy.pptx
The basics of sentences session 2pptx copy.pptx
heathfieldcps1
9548086042 for call girls in Indira Nagar with room service
9548086042 for call girls in Indira Nagar with room service
discovermytutordmt
SOCIAL AND HISTORICAL CONTEXT - LFTVD.pptx
SOCIAL AND HISTORICAL CONTEXT - LFTVD.pptx
iammrhaywood
Disha NEET Physics Guide for classes 11 and 12.pdf
Disha NEET Physics Guide for classes 11 and 12.pdf
chloefrazer622
Introduction to Nonprofit Accounting: The Basics
Introduction to Nonprofit Accounting: The Basics
TechSoup
Interactive Powerpoint_How to Master effective communication
Interactive Powerpoint_How to Master effective communication
nomboosow
Paris 2024 Olympic Geographies - an activity
Paris 2024 Olympic Geographies - an activity
GeoBlogs
BASLIQ CURRENT LOOKBOOK LOOKBOOK(1) (1).pdf
BASLIQ CURRENT LOOKBOOK LOOKBOOK(1) (1).pdf
SoniaTolstoy
1029 - Danh muc Sach Giao Khoa 10 . pdf
1029 - Danh muc Sach Giao Khoa 10 . pdf
QucHHunhnh
Recently uploaded
(20)
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
The Most Excellent Way | 1 Corinthians 13
The Most Excellent Way | 1 Corinthians 13
Measures of Central Tendency: Mean, Median and Mode
Measures of Central Tendency: Mean, Median and Mode
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
Key note speaker Neum_Admir Softic_ENG.pdf
Key note speaker Neum_Admir Softic_ENG.pdf
Activity 01 - Artificial Culture (1).pdf
Activity 01 - Artificial Culture (1).pdf
Unit-IV- Pharma. Marketing Channels.pptx
Unit-IV- Pharma. Marketing Channels.pptx
Student login on Anyboli platform.helpin
Student login on Anyboli platform.helpin
Measures of Dispersion and Variability: Range, QD, AD and SD
Measures of Dispersion and Variability: Range, QD, AD and SD
APM Welcome, APM North West Network Conference, Synergies Across Sectors
APM Welcome, APM North West Network Conference, Synergies Across Sectors
IGNOU MSCCFT and PGDCFT Exam Question Pattern: MCFT003 Counselling and Family...
IGNOU MSCCFT and PGDCFT Exam Question Pattern: MCFT003 Counselling and Family...
The basics of sentences session 2pptx copy.pptx
The basics of sentences session 2pptx copy.pptx
9548086042 for call girls in Indira Nagar with room service
9548086042 for call girls in Indira Nagar with room service
SOCIAL AND HISTORICAL CONTEXT - LFTVD.pptx
SOCIAL AND HISTORICAL CONTEXT - LFTVD.pptx
Disha NEET Physics Guide for classes 11 and 12.pdf
Disha NEET Physics Guide for classes 11 and 12.pdf
Introduction to Nonprofit Accounting: The Basics
Introduction to Nonprofit Accounting: The Basics
Interactive Powerpoint_How to Master effective communication
Interactive Powerpoint_How to Master effective communication
Paris 2024 Olympic Geographies - an activity
Paris 2024 Olympic Geographies - an activity
BASLIQ CURRENT LOOKBOOK LOOKBOOK(1) (1).pdf
BASLIQ CURRENT LOOKBOOK LOOKBOOK(1) (1).pdf
1029 - Danh muc Sach Giao Khoa 10 . pdf
1029 - Danh muc Sach Giao Khoa 10 . pdf
intro22.ppt
1.
Introduction to Python LinuxWorld
- New York City - January 2002 Guido van Rossum Director of PythonLabs at Zope Corporation guido@python.org guido@zope.com
2.
Slide 2 ©2001,
2002 Guido van Rossum Why Python? • Have your cake and eat it, too: Productivity and readable code • VHLLs will gain on system languages (John Ousterhout) • "Life's better without braces" (Bruce Eckel)
3.
Slide 3 ©2001,
2002 Guido van Rossum Tutorial Outline • interactive "shell" • basic types: numbers, strings • container types: lists, dictionaries, tuples • variables • control structures • functions & procedures • classes & instances • modules & packages • exceptions • files & standard library • what's new in Python 2.0 and beyond
4.
Slide 4 ©2001,
2002 Guido van Rossum Try It Out! • If you brought a laptop into the classroom, feel free to play along • Download Python from www.python.org • Any version will do for this class – By and large they are all mutually compatible – Recommended version: 2.1.1 or 2.2 – Oldest version still in widespread use: 1.5.2 – Avoid 1.6/1.6.1 if you can – When using 2.0 or 2.1, upgrade to 2.0.1 / 2.1.1 – 2.1.2 is coming soon! • Use IDLE if you can
5.
Slide 5 ©2001,
2002 Guido van Rossum Interactive “Shell” • Great for learning the language • Great for experimenting with the library • Great for testing your own modules • Two variations: IDLE (GUI), python (command line) • Type statements or expressions at prompt: >>> print "Hello, world" Hello, world >>> x = 12**2 >>> x/2 72 >>> # this is a comment
6.
Slide 6 ©2001,
2002 Guido van Rossum Numbers • The usual suspects • 12, 3.14, 0xFF, 0377, (-1+2)*3/4**5, abs(x), 0<x<=5 • C-style shifting & masking • 1<<16, x&0xff, x|1, ~x, x^y • Integer division truncates :-( • 1/2 -> 0 # 1./2. -> 0.5, float(1)/2 -> 0.5 • Will be fixed in the future • Long (arbitrary precision), complex • 2L**100 -> 1267650600228229401496703205376L – In Python 2.2 and beyond, 2**100 does the same thing • 1j**2 -> (-1+0j)
7.
Slide 7 ©2001,
2002 Guido van Rossum Strings • "hello"+"world" "helloworld" # concatenation • "hello"*3 "hellohellohello" # repetition • "hello"[0] "h" # indexing • "hello"[-1] "o" # (from end) • "hello"[1:4] "ell" # slicing • len("hello") 5 # size • "hello" < "jello" 1 # comparison • "e" in "hello" 1 # search • "escapes: n etc, 033 etc, if etc" • 'single quotes' """triple quotes""" r"raw strings"
8.
Slide 8 ©2001,
2002 Guido van Rossum Lists • Flexible arrays, not Lisp-like linked lists • a = [99, "bottles of beer", ["on", "the", "wall"]] • Same operators as for strings • a+b, a*3, a[0], a[-1], a[1:], len(a) • Item and slice assignment • a[0] = 98 • a[1:2] = ["bottles", "of", "beer"] -> [98, "bottles", "of", "beer", ["on", "the", "wall"]] • del a[-1] # -> [98, "bottles", "of", "beer"]
9.
Slide 9 ©2001,
2002 Guido van Rossum More List Operations >>> a = range(5) # [0,1,2,3,4] >>> a.append(5) # [0,1,2,3,4,5] >>> a.pop() # [0,1,2,3,4] 5 >>> a.insert(0, 42) # [42,0,1,2,3,4] >>> a.pop(0) # [0,1,2,3,4] 5.5 >>> a.reverse() # [4,3,2,1,0] >>> a.sort() # [0,1,2,3,4]
10.
Slide 10 ©2001,
2002 Guido van Rossum Dictionaries • Hash tables, "associative arrays" • d = {"duck": "eend", "water": "water"} • Lookup: • d["duck"] -> "eend" • d["back"] # raises KeyError exception • Delete, insert, overwrite: • del d["water"] # {"duck": "eend", "back": "rug"} • d["back"] = "rug" # {"duck": "eend", "back": "rug"} • d["duck"] = "duik" # {"duck": "duik", "back": "rug"}
11.
Slide 11 ©2001,
2002 Guido van Rossum More Dictionary Ops • Keys, values, items: • d.keys() -> ["duck", "back"] • d.values() -> ["duik", "rug"] • d.items() -> [("duck","duik"), ("back","rug")] • Presence check: • d.has_key("duck") -> 1; d.has_key("spam") -> 0 • Values of any type; keys almost any • {"name":"Guido", "age":43, ("hello","world"):1, 42:"yes", "flag": ["red","white","blue"]}
12.
Slide 12 ©2001,
2002 Guido van Rossum Dictionary Details • Keys must be immutable: – numbers, strings, tuples of immutables • these cannot be changed after creation – reason is hashing (fast lookup technique) – not lists or other dictionaries • these types of objects can be changed "in place" – no restrictions on values • Keys will be listed in arbitrary order – again, because of hashing
13.
Slide 13 ©2001,
2002 Guido van Rossum Tuples • key = (lastname, firstname) • point = x, y, z # parentheses optional • x, y, z = point # unpack • lastname = key[0] • singleton = (1,) # trailing comma!!! • empty = () # parentheses! • tuples vs. lists; tuples immutable
14.
Slide 14 ©2001,
2002 Guido van Rossum Variables • No need to declare • Need to assign (initialize) • use of uninitialized variable raises exception • Not typed if friendly: greeting = "hello world" else: greeting = 12**2 print greeting • Everything is a "variable": • Even functions, classes, modules
15.
Slide 15 ©2001,
2002 Guido van Rossum Reference Semantics • Assignment manipulates references • x = y does not make a copy of y • x = y makes x reference the object y references • Very useful; but beware! • Example: >>> a = [1, 2, 3] >>> b = a >>> a.append(4) >>> print b [1, 2, 3, 4]
16.
Slide 16 ©2001,
2002 Guido van Rossum a 1 2 3 b a 1 2 3 b 4 a = [1, 2, 3] a.append(4) b = a a 1 2 3 Changing a Shared List
17.
Slide 17 ©2001,
2002 Guido van Rossum a 1 b a 1 b a = 1 a = a+1 b = a a 1 2 Changing an Integer old reference deleted by assignment (a=...) new int object created by add operator (1+1)
18.
Slide 18 ©2001,
2002 Guido van Rossum Control Structures if condition: statements [elif condition: statements] ... else: statements while condition: statements for var in sequence: statements break continue
19.
Slide 19 ©2001,
2002 Guido van Rossum Grouping Indentation In Python: for i in range(20): if i%3 == 0: print i if i%5 == 0: print "Bingo!" print "---" In C: for (i = 0; i < 20; i++) { if (i%3 == 0) { printf("%dn", i); if (i%5 == 0) { printf("Bingo!n"); } } printf("---n"); } 0 Bingo! --- --- --- 3 --- --- --- 6 --- --- --- 9 --- --- --- 12 --- --- --- 15 Bingo! --- --- --- 18 --- ---
20.
Slide 20 ©2001,
2002 Guido van Rossum Functions, Procedures def name(arg1, arg2, ...): """documentation""" # optional doc string statements return # from procedure return expression # from function
21.
Slide 21 ©2001,
2002 Guido van Rossum Example Function def gcd(a, b): "greatest common divisor" while a != 0: a, b = b%a, a # parallel assignment return b >>> gcd.__doc__ 'greatest common divisor' >>> gcd(12, 20) 4
22.
Slide 22 ©2001,
2002 Guido van Rossum Classes class name: "documentation" statements -or- class name(base1, base2, ...): ... Most, statements are method definitions: def name(self, arg1, arg2, ...): ... May also be class variable assignments
23.
Slide 23 ©2001,
2002 Guido van Rossum Example Class class Stack: "A well-known data structure…" def __init__(self): # constructor self.items = [] def push(self, x): self.items.append(x) # the sky is the limit def pop(self): x = self.items[-1] # what happens if it’s empty? del self.items[-1] return x def empty(self): return len(self.items) == 0 # Boolean result
24.
Slide 24 ©2001,
2002 Guido van Rossum Using Classes • To create an instance, simply call the class object: x = Stack() # no 'new' operator! • To use methods of the instance, call using dot notation: x.empty() # -> 1 x.push(1) # [1] x.empty() # -> 0 x.push("hello") # [1, "hello"] x.pop() # -> "hello" # [1] • To inspect instance variables, use dot notation: x.items # -> [1]
25.
Slide 25 ©2001,
2002 Guido van Rossum Subclassing class FancyStack(Stack): "stack with added ability to inspect inferior stack items" def peek(self, n): "peek(0) returns top; peek(-1) returns item below that; etc." size = len(self.items) assert 0 <= n < size # test precondition return self.items[size-1-n]
26.
Slide 26 ©2001,
2002 Guido van Rossum Subclassing (2) class LimitedStack(FancyStack): "fancy stack with limit on stack size" def __init__(self, limit): self.limit = limit FancyStack.__init__(self) # base class constructor def push(self, x): assert len(self.items) < self.limit FancyStack.push(self, x) # "super" method call
27.
Slide 27 ©2001,
2002 Guido van Rossum Class / Instance Variables class Connection: verbose = 0 # class variable def __init__(self, host): self.host = host # instance variable def debug(self, v): self.verbose = v # make instance variable! def connect(self): if self.verbose: # class or instance variable? print "connecting to", self.host
28.
Slide 28 ©2001,
2002 Guido van Rossum Instance Variable Rules • On use via instance (self.x), search order: – (1) instance, (2) class, (3) base classes – this also works for method lookup • On assignment via instance (self.x = ...): – always makes an instance variable • Class variables "default" for instance variables • But...! – mutable class variable: one copy shared by all – mutable instance variable: each instance its own
29.
Slide 29 ©2001,
2002 Guido van Rossum Modules • Collection of stuff in foo.py file – functions, classes, variables • Importing modules: – import re; print re.match("[a-z]+", s) – from re import match; print match("[a-z]+", s) • Import with rename: – import re as regex – from re import match as m – Before Python 2.0: • import re; regex = re; del re
30.
Slide 30 ©2001,
2002 Guido van Rossum Packages • Collection of modules in directory • Must have __init__.py file • May contain subpackages • Import syntax: – from P.Q.M import foo; print foo() – from P.Q import M; print M.foo() – import P.Q.M; print P.Q.M.foo() – import P.Q.M as M; print M.foo() # new
31.
Slide 31 ©2001,
2002 Guido van Rossum Catching Exceptions def foo(x): return 1/x def bar(x): try: print foo(x) except ZeroDivisionError, message: print "Can’t divide by zero:", message bar(0)
32.
Slide 32 ©2001,
2002 Guido van Rossum Try-finally: Cleanup f = open(file) try: process_file(f) finally: f.close() # always executed print "OK" # executed on success only
33.
Slide 33 ©2001,
2002 Guido van Rossum Raising Exceptions • raise IndexError • raise IndexError("k out of range") • raise IndexError, "k out of range" • try: something except: # catch everything print "Oops" raise # reraise
34.
Slide 34 ©2001,
2002 Guido van Rossum More on Exceptions • User-defined exceptions – subclass Exception or any other standard exception • Old Python: exceptions can be strings – WATCH OUT: compared by object identity, not == • Last caught exception info: – sys.exc_info() == (exc_type, exc_value, exc_traceback) • Last uncaught exception (traceback printed): – sys.last_type, sys.last_value, sys.last_traceback • Printing exceptions: traceback module
35.
Slide 35 ©2001,
2002 Guido van Rossum File Objects • f = open(filename[, mode[, buffersize]) – mode can be "r", "w", "a" (like C stdio); default "r" – append "b" for text translation mode – append "+" for read/write open – buffersize: 0=unbuffered; 1=line-buffered; buffered • methods: – read([nbytes]), readline(), readlines() – write(string), writelines(list) – seek(pos[, how]), tell() – flush(), close() – fileno()
36.
Slide 36 ©2001,
2002 Guido van Rossum Standard Library • Core: – os, sys, string, getopt, StringIO, struct, pickle, ... • Regular expressions: – re module; Perl-5 style patterns and matching rules • Internet: – socket, rfc822, httplib, htmllib, ftplib, smtplib, ... • Miscellaneous: – pdb (debugger), profile+pstats – Tkinter (Tcl/Tk interface), audio, *dbm, ...
37.
Slide 37 ©2001,
2002 Guido van Rossum Python 2.0: What's New • Augmented assignment: x += y • List comprehensions: [s.strip() for s in f.readlines()] • Extended print: print >>sys.stderr, "Hello!" • Extended import: import foo as bar • Unicode strings: u"u1234" • New re implementation (faster, Unicode) • Collection of cyclic garbage • XML, distutils
38.
Slide 38 ©2001,
2002 Guido van Rossum Python 2.1: What's New • From __future__ import nested_scopes – def make_adder(n): def adder(x): return x+n return adder – add2 = make_adder(2) – add2(10) == 12 • Rich comparisons – Overload <, <=, ==, !=, >=, > separately • Warnings framework – Prepare for the future
39.
Slide 39 ©2001,
2002 Guido van Rossum Python 2.2: What's New • Iterators and Generators • from __future__ import generators def inorder(tree): if tree: for x in inorder(tree.left): yield x yield tree.label for x in inorder(tree.right): yield x • Type/class unification – class mydict(dict): … • Fix division operator so 1/2 == 0.5; 1//2 == 0 – Requires __future__ statement in Python 2.x – Change will be permanent in Python 3.0
40.
Slide 40 ©2001,
2002 Guido van Rossum URLs • http://www.python.org – official site • http://starship.python.net – Community • http://www.python.org/psa/bookstore/ – (alias for http://www.amk.ca/bookstore/) – Python Bookstore
41.
Slide 41 ©2001,
2002 Guido van Rossum Further Reading • Learning Python: Lutz, Ascher (O'Reilly '98) • Python Essential Reference: Beazley (New Riders '99) • Programming Python, 2nd Ed.: Lutz (O'Reilly '01) • Core Python Programming: Chun (Prentice-Hall '00) • The Quick Python Book: Harms, McDonald (Manning '99) • The Standard Python Library: Lundh (O'Reilly '01) • Python and Tkinter Programming: Grayson (Manning '00) • Python Programming on Win32: Hammond, Robinson (O'Reilly '00) • Learn to Program Using Python: Gauld (Addison-W. '00) • And many more titles...
42.
TIME FOR QUESTIONS
Download now