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python beginner talk slide

  2. 2. “Quotes” Perl is worse than Python because people wanted it worse - Larry Wall, Creator of Perl Python fits your brain - Bruce Eckel, Author: Thinking in Java Python is an excellent language & makes sensible compromises. - Peter Norvig. AI Life is better without brackets
  3. 3. About Python very clear, readable syntax portable intuitive object orientation natural expression of procedural code full modularity, supporting hierarchical packages very high level dynamic data types extensive standard libraries and third party modules for virtually every task extensions and modules easily written in C, C++ (or Java for Jython, or .NET languages for IronPython)
  4. 4. Hello Worldprint “Hello World” Hello Worlda=6print a; 6a=‘Hello’a=a+ 6 Errors a=a + str(6)
  5. 5. *.py
  6. 6. Interpreter Output
  7. 7. Interpreter
  8. 8. Stringsa=‘Hello’a=“Hello”a=“I Can’t do this”a=“I ”Love” Python”a=‘I “Love” Python’HelloHelloI Can’t do thisI “Love” PythonI “Love” Python
  9. 9. a=“Hello”print a[0]print len(a)print a[0:2]print a[2:]H5Hello
  10. 10. a=“Hello”print a[-1]print a[-2:] olo
  11. 11. More About str Classprint dir(str) [__add__, __class__, __contains__, __delattr__, __doc__, __eq__, __ge__,__getattribute__, __getitem__, __getnewargs__, __getslice__, __gt__,__hash__, __init__, __le__, __len__, __lt__, __mod__, __mul__, __ne__,__new__, __reduce__, __reduce_ex__, __repr__, __rmod__, __rmul__,__setattr__, __str__, capitalize, center, count, decode, encode, endswith,expandtabs, find, index, isalnum, isalpha, isdigit, islower, isspace, istitle,isupper, join, ljust, lower, lstrip, partition, replace, rfind, rindex, rjust,rpartition, rsplit, rstrip, split, splitlines, startswith, strip, swapcase, title,translate, upper, zfill]
  12. 12. Help Classprint help(str.find)find(...) S.find(sub [,start [,end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within s[start,end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure.
  13. 13. Some Basic Syntax(1)n Oddn is Odd and greater than 5n divided by 2 or 5
  14. 14. Some Basic Syntax(1) //Array Declaration a=[]215Using Range:215True
  15. 15. List(1)a=[3,1,5]b=[4,2]c=a+bprint cdel c[2]print cprint len(c)[3,1,5,4,2][3,1,4,2]4
  16. 16. List(2)(a,b)=([3,1,5],[4,2])c=a+b c= sorted(c)print sorted(c)print a==bprint sorted(c,reverse=True)print cprint help(sorted)[1,2,3,4,5]False[5,4,3,2,1][3, 1, 5, 4, 2]Help on built-in function sorted in module __builtin__:sorted(...) sorted(iterable, cmp=None, key=None, reverse=False) --> new sorted list
  17. 17. List and Sorta=[ax,aae,aac] return 1,”Hello World”def mFun(s): a,b=mFun(“Hi”) return s[-1]print sorted(a,key=mFun)print sorted(a,key=mFun,reverse=True)print sorted(a,key=len)[aac, aae, ax][ax, aae, aac][ax, aae, aac]
  18. 18. Tuplesa=(1,2,1)print a[0]print len(a)b=[(1,2,3),(1,2,1),(1,4,1)]print a in b13True
  19. 19. Tuples and sorta=[(1,"b"),(2,"a"),(1,"e")]print aprint sorted(a)def myTSort(d): return d[0]print sorted(a,key=myTSort)k=(1,”e”)print k in a[(1, b), (2, a), (1, e)][(1, b), (1, e), (2, a)][(2, a), (1, b), (1, e)]True
  20. 20. Dictionary d={} d[‘a’]=‘alpha’ d[‘o’]=‘omega’ d[‘g’]=‘gamma’ print d[‘a’] alpha
  21. 21. Dictionaryd={}(d[a],d[o],d[g])=("alpha","omega","gamma")print dprint len(d){a: alpha, g: gamma, o: omega}3Check a value is in dictionary ???‘a’ in d
  22. 22. Dictionaryd={}(d[a],d[o],d[g])=("alpha","omega","gamma")print d[‘a’]print d[‘x’] //???print d.get(‘x’) // return Noneprint d.get(‘a’) if(d.get(‘a’)){ print ‘Yes’ }
  23. 23. Dictionaryd={}(d[a],d[o],d[g])=("alpha","omega","gamma")print d.keys()print d.values()print d.items()[a, g, o][alpha, gamma, omega][(a, alpha), (g, gamma), (o, omega)]What needs for sorted dictionary data(key order) ???All data returns random orderfor k in sorted( d.keys() ): print d[k]print sorted(d.keys())
  24. 24. Dictionaryprint dir(dict)[__class__, __cmp__, __contains__, __delattr__, __delitem__,__doc__, __eq__, __ge__, __getattribute__, __getitem__, __gt__,__hash__, __init__, __iter__, __le__, __len__, __lt__, __ne__,__new__, __reduce__, __reduce_ex__, __repr__, __setattr__,__setitem__, __str__, clear, copy, fromkeys, get, has_key, items,iteritems, iterkeys, itervalues, keys, pop, popitem, setdefault, update,values]print help(dict)print help(dict.items)
  25. 25. Filedef readFile(fileName): // File write f=open(fileName,r) f=open(fileName,‘w) f.write(data) for line in f: f.close() print line, f.close()def readFile(fileName): f=open(fileName,r) print text f.close()
  26. 26. Regular expressionimport,"God oder")print,"God oder")print
  27. 27. Regular expressionimport reprint re.findall(rar+,a ar arr)print re.findall(rar*,a ar arr)[ar, arr][a, ar, arr]+ for 1 or more* for 0 or moreprint dir(re)
  28. 28. Utility: OSimport osprint dir(os)[F_OK, O_APPEND, O_BINARY, O_CREAT, O_EXCL,O_NOINHERIT, O_RANDOM, O_RDONLY, O_RDWR,O_SEQUENTIAL, UserDict, W_OK, X_OK, _Environ, __all__,__builtins__, __doc__, __file__, __name__, _copy_reg,_pickle_statvfs_result, abort, access, altsep, chdir, chmod, close,curdir, defpath, isatty, linesep, listdir, lseek, lstat, makedirs, mkdir,name, open, pardir, path, pathsep, pipe, popen, popen2, popen3,popen4, putenv, read, remove, removedirs, rename, renames, rmdir,sep, spawnl, spawnle, spawnv, spawnve, startfile, stat,stat_float_times, stat_result, statvfs_result, strerror, sys, system,tempnam, times, tmpfile, tmpnam, umask, unlink, unsetenv,urandom, utime, waitpid, walk, write]
  29. 29. Utility: OSimport osprint help(os.unlink)unlink(...) unlink(path) Remove a file (same as remove(path)).print help(os.rmdir)rmdir(...) rmdir(path) Remove a directory.
  30. 30. Utility: HTTP request, URLtry: passexcept: passfinally: print “ok”
  31. 31. Some OOP class MyClass(AnotherClass): import
  32. 32. Some OOP (Thread)
  33. 33. Access Shared Resource
  34. 34. Database(Sqlite)
  35. 35. Database(MySql)
  36. 36. Reserved Word and  finally  pass assert  for  print break  from  raise class  global  return continue  if  try def  import  while del  in elif  is else  lambda except  not exec  or
  37. 37. Code Source
  38. 38. Resource python-class/
  39. 39. THANK YOU