Python language and some usage for it under Linux.

1. Programming Under Linux In Python Marwan Osman [email_address]

3. Why Python ???

4. Syntax Walkthroughs

5. Linux and Python

7. Why Python ???

8. Syntax Walkthroughs

9. Linux and Python

11. named after Monty Python's Flying Circus

12. http://www.python.org/~guido/

13. Blog http://neopythonic.blogspot.com/

14. Now works for Google

16. interpreted, interactive, object-oriented.

17. incorporates modules, exceptions, dynamic typing, very high level dynamic data types, and classes, automatic memory management.

18. remarkable power with very clear syntax.

19. has interfaces to many system calls and libraries, as well as to various window systems, and is extensible in C or C++.

20. usable as an extension language for applications that need a programmable interface.

22. portable: runs on many 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 !

25. Jython - implemented for the JVM

26. Pypy - implemented in Python

27. IronPython - implemented in C#, allows python to use the .NET libraries

29. Why Python ???

30. Syntax Walkthroughs

31. Linux and Python

33. Fast development and all just works the first time...

34. very high level dynamic data types

35. Dynamic typing and automatic memory management

36. Paradigm of your choice

38. Availability (cross-platform)

39. Interactivity (interpreted language)

41. Strong introspection capabilities

42. Intuitive object orientation

43. Natural expression of procedural code

44. Full modularity, supporting hierarchical packages

45. Exception­based error handling

46. The ability to be embedded within applications as a scripting interface

47. Scalable – can play nicely with other languages

49. date and time, collections, theads and mutexs

50. OS and shell level functions (mv, rm, ls)

51. Support for SQLite and Berkley databases

52. zlib, gzip, bz2, tarfile, csv, xml, md5, sha

53. logging, subprocess, email, json

54. httplib, imaplib, nntplib, smtplib

55. and much, much more ...

57. SciPy - Linear algebra, signal processing

58. NumPy - Fast compact multidimensional arrays

59. PyGame - Game Development

60. Visual Python - real-time 3D output

61. Django - High-level python Web framework

62. and much more ...

64. ” Google: Python has been an important part of Google since the beginning.”, Peter Norvig.

66. Mobile phones: Nokia S60 (Symbian), PythonCE

67. P2P: BitTorrent

69. Memory economy hard to achieve (high level data-structures)

70. Relies on a locking mechanism called the Global Interpreter Lock (GIL) in multi-threading

72. Use multiple processes instead of multiple threads

73. Use a different language

74. Use Stackless Python

76. Why Python ???

77. Syntax Walkthroughs

78. Linux and Python

81. Floating point: 4.23 , 42.8E-4

83. Single quotes, double quotes ,triple quotes (multiline)

84. 'Hello Word' , ”Hello World” , '''Hello World''' , ”””Hello World”””

85. Concatenation : 'What's ' 'your name?'

86. automatically converted in to "What's your name?”

87. Strings: format() >>>age = 25 >>>name = 'Swaroop' >>> print ( '{0} is {1} years old' .format(name, age)) Swaroop is 25 years old >>> '{0:.3}' .format( 1 / 3 ) '0.333' >>> '{0:_^11}' .format( 'hello' ) '___hello___' >>> '{name} wrote {book}' .format(name= 'Swaroop' , book= 'A Byte of Python' ) 'Swaroop wrote A Byte of Python'

89. The rest of the identifier name can consist of letters (uppercase ASCII or lowercase ASCII or Unicode character), underscores ('_') or digits (0-9).

90. Identifier names are case-sensitive. For example, myname and myName are not the same.

93. 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

95. [1, 2, 4, “Hello”, False]

99. 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' )

101. 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 )

103. Modules can be imported or run by themselves if __name__ == '__main__' : print ( 'This program is being run by itself' ) else : print ( 'I am being imported from another module' )

104. Modules #!/usr/bin/python # Filename: mymodule_demo.py import mymodule mymodule.sayhi() print ( 'Version' , mymodule.__version__) #!/usr/bin/python # Filename: mymodule.py def sayhi (): print ( 'Hi, this is mymodule speaking.' ) __version__ = '0.1' # End of mymodule.py

105. OOP class MyClass : &quot;&quot;&quot;This is a docstring.&quot;&quot;&quot; name = &quot;Eric&quot; def say (self): return ( 'My name is {0}' .format(name)) instance = MyClass() print instance.say()

106. OOP class Person : def __init__ (self, name): self.name = name def __del__ (self): print ( 'deleting this person' ,self.name) def sayHi (self): print ( 'Hello, my name is' , self.name) p = Person( 'Swaroop' ) p.sayHi() del p

110. Input & Output #input something = input( 'Enter text: ' ) #output print (something)

111. Files myString = ”This is a test string” f = open( 'test.txt' , 'w' ) # open for 'w'riting f.write(myString) # write text to file f.close() # close the file f = open( 'test.txt' ) #read mode while True : line = f.readline() if len(line) == 0 : # Zero length indicates EOF break print (line, end= '' ) f.close() # close the file

112. Pickle import pickle shoplistfile = 'shoplist.data' shoplist = [ 'apple' , 'mango' , 'carrot' ] f = open(shoplistfile, 'wb' ) pickle.dump(shoplist, f) # dump the object to a file f.close() del shoplist # destroy the shoplist variable f = open(shoplistfile, 'rb' ) storedlist = pickle.load(f) # load the object from the file print (storedlist)

114. Standard Library

115. Passing Tuples

116. Logging Module

118. Why Python ???

119. Syntax Walkthroughs

120. Linux and Python

123. Linux and Python ” Talk is cheap. Show me the code.” Linus Torvalds

125. Simple XML Processing

126. Simple Spell Checker

127. Python Virus

128. Open Office Script

129. Rhythmbox python console

130. Basic Twitter client

131. Open Office macro script for python syntax Highlighing Demo #!usr/bin/python #Send a new Tweet from getpass import getpass import tweepy username = raw_input( 'Twitter username: ' ) password = getpass( 'Twitter password: ' ) basic_auth = tweepy.BasicAuthHandler(username, password) api = tweepy.API(basic_auth) api.update_status( &quot;Hello Twitter !!! I'm a Pythoneer&quot; )

133. http://www.python.org/doc/faq/

134. Learn Python in 10 minutes: http://www.poromenos.org/tutorials/python

135. Byte of Python: http://www.swaroopch.com/notes/Python

136. Dive Into Python: http://diveintopython.org/

137. Google

138. Any Questions ???

139. Thank You