Learn python in linux and kick start your career

1. Programming at the speed of light Pythonism Kracekumar.R [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++.

21. 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 !

24. Jython - implemented for the JVM

25. Pypy - implemented in Python

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

28. Why Python ???

29. Syntax Walkthroughs

30. Linux and Python

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

33. very high level dynamic data types

34. Dynamic typing and automatic memory management

36. Availability (cross-platform)

37. Interactivity (interpreted language)

39. Strong introspection capabilities

40. Intuitive object orientation

41. Natural expression of procedural code

42. Full modularity, supporting hierarchical packages

43. Exception­based error handling

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

45. Scalable – can play nicely with other languages

47. date and time, collections, threads and mutexs

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

49. Support for SQLite and Berkley databases

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

51. logging, subprocess, email, json

52. httplib, imaplib, nntplib, smtplib

53. and much, much more ...

55. SciPy - Linear algebra, signal processing

56. NumPy - Fast compact multidimensional arrays

57. PyGame - Game Development

58. Visual Python - real-time 3D output

59. Django - High-level python Web framework

60. and much more ...

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

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

65. P2P: BitTorrent

67. EVE Online, a Massively Multi player Online Game (MMOG), makes extensive use of Python.

68. iRobot uses Python to develop commercial robotic devices.

70. GUI

71. Internet Scripting

72. Database Programming

73. Numeric and Scientific Programming

74. Natural language analysis

78. Why Python ???

79. Syntax Walkthroughs

80. Linux and Python

81. Talk is cheap. Show me the code. Linus Torvaldus

85. 5

86. >>> 2*3

87. 6

88. >>> 2/3

89. 0

90. >>> 2//3

91. 0

93. 0.66666666666666663

94. >>> 2.0/3

95. 0.66666666666666663

96. >>> 2/3.0

97. 0.66666666666666663

98. >>> 2-3

99. -1

101. (3+4j)

102. >>> 5+4j+5+6j

103. (10+10j)

104. >>> pow(4,5)

105. 1024

106. >>> 4**5

107. 1024

109. 3

110. >>> long(34.999999)

111. 34L

112. >>> int(34.9999)

113. 34

114. >>> str(5)

115. '5'

117. '-'

118. >>> ord('a')

119. 97 You can do more in interactive shell ,But you might be bored,so Lets start writing small scripts

121. Run python first.py ,Your program will be interpreted and python will produce .pyc in memory .

122. .pyc =>python compiled

123. Duck typed programming language

125. >>> type(b)

126. <type 'str'>

127. >>> b=23

128. >>> type(b)

129. <type 'int'>

130. >>> c=32L

131. >>> type(c)

132. <type 'long'>

134. >>> c

135. 8254602048994769474255309139320571976856989469314398783249386078541779727448825929287769623244643560854287421769642635607536680617229461519539671538483430889193541937484454440136429963694163141453503639190799818814812942074243152169349951543234944945149040326527156224L

136. >>> len(str(c))

137. 268

138. Str() =>Find string length

140. >>> name1=&quot;krace&quot;

141. >>> name2=&quot;&quot;&quot;krace&quot;&quot;&quot;

142. >>> name3='''krace'''

143. >>> name

144. 'krace'

145. >>> name1

146. 'krace'

147. >>> name2

148. 'krace'

149. >>> name3

150. 'krace'

152. Strings

153. >>> name=&quot;kracekumar&quot;

154. >>> name[1:]

155. 'racekumar'

156. >>> name[:1]

157. 'k'

158. >>> name[:5]

159. 'krace'

160. >>> name[:-5]

161. 'krace'

163. Traceback (most recent call last):

164. File &quot;<stdin>&quot;, line 1, in <module>

165. TypeError: 'str' object does not support item assignment

166. >>> name

167. 'kracekumar'

168. >>> name=&quot;K&quot;+name[1:]

169. >>> name

170. 'Kracekumar'

171. Above is a small hack to change the first character value in the name

173. 'race'

174. >>> name + &quot; likes linux &quot; #concatenation

175. 'Kracekumar likes linux '

176. >>> name.startswith('k')

177. False

178. >>> name.upper()

179. 'KRACEKUMAR'

181. >>> dir()

182. ['__builtins__', '__doc__', '__name__', '__package__', 'a', 'b', 'c', 'name', 'name1', 'name2', 'name3', 'sys']

183. dir(anyname) =>will yield all the supported functions.

187. List => a=[1,”linux”,2,”Free Bsd”]

188. Tuple => b=(1,”apple”,mango)#mango is not quoted because here it refers variable

189. Dictionary =>dict={”name”:”kracekumar”,”email”:” [email_address] ”,”coll”:”Amrita”}

190. Don't worry guys you have array but i will introduce later

192. [1, 'linux', 2, 'Free Bsd']

193. >>> b

194. (1, 'apple', 'mango')

195. >>> dict

196. {'coll': 'Amrita', 'name': 'kracekumar', 'email': 'kracethekingmaker@gmail.com'}

197. List is not linked list here

198. You can have string ,int,float in list,tuple,dictionary

200. <type 'list'>

201. >>> type(b)

202. <type 'tuple'>

203. >>> type(dict)

204. <type 'dict'>

205. Tuple is immutable

207. 'linux'

208. >>> a[1]=&quot;UBuntu&quot;

209. >>> a[1]

210. 'UBuntu'

211. >>> a

212. [1, 'UBuntu', 2, 'Free Bsd']

214. 'apple'

215. >>> b[1]=&quot;pine apple&quot;

216. Traceback (most recent call last):

217. File &quot;<stdin>&quot;, line 1, in <module>

218. TypeError: 'tuple' object does not support item assignment

219. >>> b

220. (1, 'apple', 'mango')

222. {'coll': 'Amrita', 'name': 'kracekumar', 'email': 'kracethekingmaker@gmail.com '}

223. coll =>is key and 'Amrita' =>value

224. All key should be unique

225. >>> dict['coll']=&quot;ASE&quot;

226. >>> print dict

227. {'coll': 'ASE', 'name': 'kracekumar', 'email': 'kracethekingmaker@gmail.com'}

228. >>> dir(dict)

231. Pop()

232. Items()

233. Slicing holds for list 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

236. List comprehension

237. E.g >>> x=[y for y in range(0,20) if y%2 == 0]

238. >>> x

239. [0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

240. Alternate way to do

241. Open list_comp.py

242. Dictionaries,list,tuple can be nested

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 )

247. >>> b=a

248. >>> a[0]=4

249. >>> b

250. [4, 2, 3]

251. >>> a

252. [4, 2, 3]

253. If you want to have copy of a list use slice or import copy(use dir and find out)

256. Get a list of zip file content and its size =>zip_length.py

257. Get current system name and ip=>details.py

258. Generate a random password using python

260. 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' )

262. ... if not L:

263. ... return 0

264. ... else:

265. # Call myself

266. ... return L[0] + mysum(L[1:])

267. >>> mysum([1, 2, 3, 4, 5])

268. 15

271. Note no new keyword

272. first_class.py

273. Isinstance()

274. issubclass()

276. getattr(obj,attr)=>retrieves attr value

277. setattr(obj,attr,val)=>set attr value

278. delattr(obj,attr)

279. first_class.py

280. add_book.py

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

283. Learn Python in 10 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. Google

287. Any Questions ???

288. Thank You