This document provides an overview of the Python programming language. It includes several code examples and summaries of key Python concepts like strings, lists, tuples, dictionaries, files, regular expressions, and object-oriented programming. It also lists some common Python functions and modules for tasks like HTTP requests and database access. The document aims to introduce Python's main features and provide basic code samples to help new Python learners.

1. ABU ZAHED JONY

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. 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. Hello World
print “Hello World”
Hello World
a=6
print a;
6
a=‘Hello’
a=a+ 6
Errors a=a + str(6)

5. *.py

6. Interpreter Output

7. Interpreter

8. Strings
a=‘Hello’
a=“Hello”
a=“I Can’t do this”
a=“I ”Love” Python”
a=‘I “Love” Python’
Hello
Hello
I Can’t do this
I “Love” Python
I “Love” Python

9. a=“Hello”
print a[0]
print len(a)
print a[0:2]
print a[2:]
H
5
He
llo

10. a=“Hello”
print a[-1]
print a[-2:]
o
lo

11. More About str Class
print 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. Help Class
print 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. Some Basic Syntax(1)
n Odd
n is Odd and greater than 5
n divided by 2 or 5

14. Some Basic Syntax(1)
//Array Declaration
a=[]
2
1
5
Using Range:
2
1
5
True

15. List(1)
a=[3,1,5]
b=[4,2]
c=a+b
print c
del c[2]
print c
print len(c)
[3,1,5,4,2]
[3,1,4,2]
4

16. List(2)
(a,b)=([3,1,5],[4,2])
c=a+b
c= sorted(c)
print sorted(c)
print a==b
print sorted(c,reverse=True)
print c
print 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. List and Sort
a=['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. Tuples
a=(1,2,1)
print a[0]
print len(a)
b=[(1,2,3),(1,2,1),(1,4,1)]
print a in b
1
3
True

19. Tuples and sort
a=[(1,"b"),(2,"a"),(1,"e")]
print a
print 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. Dictionary
d={}
d[‘a’]=‘alpha’
d[‘o’]=‘omega’
d[‘g’]=‘gamma’
print d[‘a’]
alpha

21. Dictionary
d={}
(d['a'],d['o'],d['g'])=("alpha","omega","gamma")
print d
print len(d)
{'a': 'alpha', 'g': 'gamma', 'o': 'omega'}
3
Check a value is in dictionary ???
‘a’ in d

22. Dictionary
d={}
(d['a'],d['o'],d['g'])=("alpha","omega","gamma")
print d[‘a’]
print d[‘x’] //???
print d.get(‘x’) // return None
print d.get(‘a’)
if(d.get(‘a’)){
print ‘Yes’
}

23. Dictionary
d={}
(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 order
for k in sorted( d.keys() ):
print d[k]
print sorted(d.keys())

24. Dictionary
print 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. File
def 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')
text=f.read()
print text
f.close()
f.seek(5)

26. Regular expression
import re
match=re.search('od',"God oder")
print match.group()
match=re.search(r'od',"God oder")
print match.group()
od
od

27. Regular expression
import re
print re.findall(r'ar+','a ar arr')
print re.findall(r'ar*','a ar arr')
['ar', 'arr']
['a', 'ar', 'arr']
+ for 1 or more
* for 0 or more
print dir(re)

28. Utility: OS
import os
print 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. Utility: OS
import os
print help(os.unlink)
unlink(...)
unlink(path)
Remove a file (same as remove(path)).
print help(os.rmdir)
rmdir(...)
rmdir(path)
Remove a directory.

30. Utility: HTTP request, URL
try:
pass
except:
pass
finally:
print “ok”

31. Some OOP
class MyClass(AnotherClass):
import myClass.py

32. Some OOP (Thread)

33. Access Shared Resource

34. Database(Sqlite)

35. Database(MySql)

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. Code Source
http://jpython.blogspot.com/

38. Resource
 http://www.learnpython.org/
 http://learnpythonthehardway.org/book/
 http://code.google.com/edu/languages/google-
python-class/
 http://love-python.blogspot.com
 http://jpython.blogspot.com

39. THANK YOU