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Learn python
This document provides an overview of the Python programming language, including its history, key features, and common uses. It discusses how Python is an interpreted, object-oriented language with dynamic typing and automatic memory management. Examples are given of Python's syntax for numbers, strings, modules, data structures like lists and dictionaries, and the interactive shell. Popular applications of Python like web development, science, and games are also mentioned.
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Learn python
- 1. Programming at thespeed of light Pythonism Kracekumar.R [email_address]
- 2. Agenda What isPython ???
- 3.
- 4.
- 5.
- 6. What is Python??? What is Python ???
- 7.
- 8.
- 9.
- 10. History Created byGuido von Rossum in 1990 (BDFL)
- 11. named after MontyPython's Flying Circus
- 12.
- 13.
- 14. Now works forGoogle
- 15. What is Python??? general-purpose high-level programming language, often used as a scripting language.
- 16.
- 17. incorporates modules, exceptions,dynamic typing, very high level dynamic data types, and classes, automatic memory management.
- 18. remarkable power withvery clear syntax.
- 19. has interfaces tomany system calls and libraries, as well as to various window systems, and is extensible in C or C++.
- 20. What is Python??? supports multiple programming paradigms (primarily object oriented, imperative, and functional)
- 21. portable: runs onmany Unix variants, on the Mac, and on PCs under MS-DOS, Windows, Windows NT, OS/2, FreeBSD Solaris, OS/2, Amiga,AROS, AS/400, BeOS, OS/390, z/OS, Palm OS, QNX, VMS, Psion, Acorn RISC OS, VxWorks, PlayStation, Sharp Zaurus, Windows CE and even PocketPC !
- 22. What is Python??? Developed and supported by a large team of volunteers - Python Software Foundation
- 23. Major implementations: CPython,Jython, Iron Python, PyPy CPython - implemented in C, the primary implementation
- 24. Jython - implementedfor the JVM
- 25. Pypy - implementedin Python
- 26. IronPython - implementedin C#, allows python to use the .NET libraries
- 27. Why Python ???What is Python ???
- 28.
- 29.
- 30.
- 31. Why Python ???Readability, maintainability, very clear readable syntax
- 32. Fast development andall just works the first time...
- 33. very high leveldynamic data types
- 34. Dynamic typing andautomatic memory management
- 35. Free and opensource Implemented under an open source license. Freely usable and distributable, even for commercial use. Simplicity , Great first language
- 36.
- 37.
- 38. Why Python ???GUI support – GUIs typically developed with Tk
- 39.
- 40.
- 41. Natural expression ofprocedural code
- 42. Full modularity, supportinghierarchical packages
- 43.
- 44. The ability tobe embedded within applications as a scripting interface
- 45. Scalable – canplay nicely with other languages
- 46. Batteries Included ThePython standard library is very extensive regular expressions, codecs
- 47. date and time,collections, threads and mutexs
- 48. OS and shelllevel functions (mv, rm, ls)
- 49. Support for SQLiteand Berkley databases
- 50. zlib, gzip, bz2,tarfile, csv, xml, md5, sha
- 51.
- 52. httplib, imaplib, nntplib,smtplib
- 53. and much, muchmore ...
- 54. Python Libraries Biopython- Bioinformatics
- 55. SciPy -Linear algebra, signal processing
- 56. NumPy - Fastcompact multidimensional arrays
- 57. PyGame - GameDevelopment
- 58. Visual Python -real-time 3D output
- 59. Django - High-levelpython Web framework
- 60.
- 61. E.g. Projects withPython Websites: Google, YouTube, Yahoo Groups & Maps, CIA.gov Appengine: http://code.google.com/appengine/
- 62. ” Google: Pythonhas been an important part of Google since the beginning.”, Peter Norvig.
- 63. Python application serversand Python scripting to create the web UI for BigTable (their database project) Systems: NASA, LALN, CERN, Rackspace Nasa Nebula http://nebula.nasa.gov/about Games: Civilization 4, Quark (Quake Army Knife)
- 64. Mobile phones: NokiaS60 (Symbian), PythonCE
- 65.
- 66. Cont . .. Maya, a powerful integrated 3D modeling and animation system, provides a Python scripting API.
- 67. EVE Online, aMassively Multi player Online Game (MMOG), makes extensive use of Python.
- 68. iRobot uses Pythonto develop commercial robotic devices.
- 69. What can youdo with Python Systems Programming
- 70.
- 71.
- 72.
- 73. Numeric and ScientificProgramming
- 74.
- 75. What people sayabout Python ? I can remember many Python idioms because they're simpler. That's one more reason I program faster [in Python]. I still have to look up how to open a file every time I do it in Java. In fact, most things in Java require me to look something up. --Bruce Eckel
- 76. Cont . .. Python ... is compact -- you can hold its entire feature set (and at least a concept index of its libraries) in your head. -- Eric S. Raymond
- 77. Syntax Walkthroughs Whatis Python ???
- 78.
- 79.
- 80.
- 81. Talk is cheap.Show me the code. Linus Torvaldus
- 82. Hello World Python2.6 Python 3.0 print (“Hello World”) print “Hello World”
- 83. Starting python Openterminal and Enter python and hit enter Something like this kracekumar@kracekumar-laptop:~$ python Python 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>>
- 84.
- 85.
- 86.
- 87.
- 88.
- 89.
- 90.
- 91.
- 92. Interactive Shell cont. . . >>> 2.0/3.0
- 93.
- 94.
- 95.
- 96.
- 97.
- 98.
- 99.
- 100. Interactive shell Cont. . . >>> complex(3,4)
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- 114.
- 115.
- 116. Still more Interactiveshell >>> chr(45)
- 117.
- 118.
- 119. 97 You cando more in interactive shell ,But you might be bored,so Lets start writing small scripts
- 120. First program Openfirst.py
- 121. Run python first.py,Your program will be interpreted and python will produce .pyc in memory .
- 122.
- 123. Duck typed programminglanguage
- 124. Interactive Shell (Revisited)>>> b='0x123'
- 125.
- 126.
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- 128.
- 129.
- 130.
- 131.
- 132.
- 133. Cont . .. >>> c=2**890
- 134.
- 135.
- 136.
- 137.
- 138. Str() =>Find stringlength
- 139. String >>>name='krace'
- 140.
- 141.
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- 149.
- 150.
- 151. Importing in builtmodules Open try_import .py
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- 160.
- 161.
- 162. Strings are immutable>>> name[0]="a"
- 163. Traceback (most recentcall last):
- 164. File "<stdin>", line1, in <module>
- 165. TypeError: 'str' objectdoes not support item assignment
- 166.
- 167.
- 168.
- 169.
- 170.
- 171. Above is asmall hack to change the first character value in the name
- 172.
- 173.
- 174. >>> name +" likes linux " #concatenation
- 175.
- 176.
- 177.
- 178.
- 179.
- 180. Python introspection Pythonintrospection lets you to find all builtin functions,classes etc. . .
- 181.
- 182. ['__builtins__', '__doc__', '__name__','__package__', 'a', 'b', 'c', 'name', 'name1', 'name2', 'name3', 'sys']
- 183. dir(anyname) =>will yieldall the supported functions.
- 184. In Built helphelp(anyname)
- 185. >>> help(a) noPython documentation found for '123' #here no documentation is available so you won't find help(sys) Find the magic here :)
- 186. Data structure 3in built data structure
- 187.
- 188. Tuple => b=(1,”apple”,mango)#mangois not quoted because here it refers variable
- 189. Dictionary =>dict={”name”:”kracekumar”,”email”:” [email_address]”,”coll”:”Amrita”}
- 190. Don't worry guysyou have array but i will introduce later
- 191.
- 192. [1, 'linux', 2,'Free Bsd']
- 193.
- 194.
- 195.
- 196. {'coll': 'Amrita', 'name':'kracekumar', 'email': 'kracethekingmaker@gmail.com'}
- 197. List is notlinked list here
- 198. You can havestring ,int,float in list,tuple,dictionary
- 199. Data structure inpython >>> type(a)
- 200.
- 201.
- 202.
- 203.
- 204.
- 205.
- 206. Cont . .. >>> a[1]
- 207.
- 208.
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- 210.
- 211.
- 212. [1, 'UBuntu', 2,'Free Bsd']
- 213. Cont . .. >>> b[1]
- 214.
- 215.
- 216. Traceback (most recentcall last):
- 217. File "<stdin>", line1, in <module>
- 218. TypeError: 'tuple' objectdoes not support item assignment
- 219.
- 220.
- 221.
- 222. {'coll': 'Amrita', 'name':'kracekumar', 'email': 'kracethekingmaker@gmail.com '}
- 223. coll =>is keyand 'Amrita' =>value
- 224. All key shouldbe unique
- 225.
- 226.
- 227. {'coll': 'ASE', 'name':'kracekumar', 'email': 'kracethekingmaker@gmail.com'}
- 228.
- 229. Dictionary functions dir()and help() will help you to know more about list tuple
- 230.
- 231.
- 232.
- 233. Slicing holds forlist and tuples
- 234. Control Flow if guess == number: #do something elif guess < number: #do something else else : #do something else while True : #do something #break when done break else : #do something when the loop ends for i in range( 1 , 5 ): print (i) else : print ( 'The for loop is over' ) #1,2,3,4 for i in range( 1 , 5 , 2 ): print (i) else : print ( 'The for loop is over' ) #1,3
- 235. Program Wap tofind a no is prime or not
- 236.
- 237. E.g >>> x=[yfor y in range(0,20) if y%2 == 0]
- 238.
- 239. [0, 2, 4,6, 8, 10, 12, 14, 16, 18]
- 240.
- 241.
- 242.
- 243. Functions Order isimportant unless using the name Default arguments are supported def sayHello (): print ( 'Hello World!' ) def foo (name, age, address) : pass foo( 'Tim' , address= 'Home' , age= 36 ) def greet (name= 'World' )
- 244. Functions Variable lengthargs acceptable as a list or dict def total (initial= 5 , *numbers, **keywords): count = initial for number in numbers: count += number for key in keywords: count += keywords[key] return count print (total( 10 , 1 , 2 , 3 , vegetables= 50 , fruits= 100 ))
- 245. Functions def printMax (x, y): '''Prints the maximum of two numbers. The two values must be integers.''' x = int(x) # convert to integers, if possible y = int(y) if x > y: r eturn x else : r eturn y printMax( 3 , 5 )
- 246. Last important thingabout variable >>> a=[1,2,3]
- 247.
- 248.
- 249.
- 250.
- 251.
- 252.
- 253. If you wantto have copy of a list use slice or import copy(use dir and find out)
- 254. File Handling Wapto read input from user and write back to file . =>fav_movie.py Wap to read set of numbers and write to file and read the file and add all the nos.=>pickling.py Swap 3 nos
- 255. Practice problem Geta particular line from a file = >get_particular_line.py
- 256. Get a listof zip file content and its size =>zip_length.py
- 257. Get current systemname and ip=>details.py
- 258. Generate a randompassword using python
- 259. Modules Any pythonfile is considered a module
- 260. Modules can beimported or run by themselves if __name__ == '__main__' : print ( 'This program is being run by itself' ) else : print ( 'I am being imported from another module' )
- 261. Recursion >>>def mysum(L):
- 262. ... ifnot L:
- 263.
- 264.
- 265.
- 266. ... returnL[0] + mysum(L[1:])
- 267. >>> mysum([1, 2,3, 4, 5])
- 268.
- 269. OOPs Python OOPis easy and simple
- 270. Class classname: Defname(): Objects instance=classname()
- 271. Note no newkeyword
- 272.
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- 281.
- 282.
- 283. Learn Python in10 minutes: http://www.poromenos.org/tutorials/python
- 284. Byte of Python: http://www.swaroopch.com/notes/Python
- 285. Dive Into Python: http://diveintopython.org/
- 286.
- 287.
- 288.