Python 1

python(p1)
Presenter : Ramin Najjarbashi
Email: ramin.najarbashi@ .com

Who am I?
● Farhamg.Name
● Robocup Server 2D
● GNegar
● BadTag
● BlueWay
● UMS
● Xbuilder
● ...

Contents● What is Python?
● Hello world!
● RUN SCRIPTS!
● What is the object in Python?
● Python like as calculator!
● String and other types in Python!
● Function & Classes!
● Repeat the decision in Program!
● I/O files ;D
● HEEEEEEEEEEEEEEEEEEEEEELP!

● Guido van Rossum
history
https://soundcloud.com/mashhadsoftwaretalks
http://www.slideshare.net/ramin311/python-part-0

Hello world
printprint ""hello worldhello world""

from interpreter
$ python$ python
>>>>>>print "print "hello worldhello world""
hello worldhello world

Python 3
$ python$ python
>>>>>>print ("print ("hello worldhello world")")
hello worldhello world

repl
$ python$ python # ...# ...
>>>>>> 2 + 22 + 2 # Read, Eval# Read, Eval
44 # Print# Print
>>>>>> # Loop# Loop

ObjectsEverything is an Object!

Objects
Obj
id
Value
Immutable
Mutable
Tuple
Integer
String
List
Dictionary

Mutable
>>>>>> bb == [ ][ ]
>>>>>> idid ((bb))
140675605442000140675605442000
>>>>>> bb .. appendappend(( 33 ))
>>>>>> bb
[3][3]
>>>>>> idid ((bb))
140675605442000140675605442000 # SAME!# SAME!

Immutable
>>>>>> aa == 44
>>>>>> idid ((aa))
64068966406896
>>>>>> aa == a + 1a + 1
>>>>>> idid ((aa))
64068726406872 # DIFFERENT!# DIFFERENT!

Variables
>>>>>> a =a = 44 # Integer# Integer
>>>>>> b =b = 5.65.6 ## FloatFloat
>>>>>> c =c = “hello”“hello” ## StringString
>>>>>> d =d = “4”“4” ## rebound to Stringrebound to String

naming
Lowercase
underscore_between_words
don't
start
with
numbers

naming
Lowercase
don't
start
with
numbers
SEE PEP 8

PEP
Python Enhancement
Proposal (similar to
JSR in Java)

PEP
Python Enhancement
Proposal (similar to
JSR in Java)
http://www.python.org/dev/peps/

math
Operator Description
+ addition
- subtraction
* multiplication
/ division
// integer division
% remainder
** power

MATH
$ python$ python
>>>>>> 3/43/4
00
>>>>>> 3/4.3/4.
0.750.75

MATH
$ python$ python
>>>>>> 2.5+3j * 52.5+3j * 5
(2.5+15j)(2.5+15j)
>>>>>> 2 ** 1000002 ** 100000
999002093014384...L999002093014384...L
(in next slide!)(in next slide!)

MATH
$ python$ python
>>>>>> 0.1 + 0.20.1 + 0.2
0.300000000000000040.30000000000000004

MATH
$ python$ python
>>>>>> 0.1 + 0.20.1 + 0.2
0.300000000000000040.30000000000000004
You can check out the decimal module if you need more exact answers.

Strings
>>>>>> printprint 'He said, "I'He said, "I '' m sorry"'m sorry"'
He said, "I'm sorry"He said, "I'm sorry"
>>>>>> printprint '''He said, "I'm sorry"''''''He said, "I'm sorry"'''
>>>>>> printprint """He said, "I'm sorry"""He said, "I'm sorry "" """"""
>>>>>> a =a = """He said, "I'm sorry"""He said, "I'm sorry "" """"""

Strings
>>>>>> #c-like#c-like
>>>>>> " %s %s "" %s %s " % (% ( 'hello''hello' ,, 'world''world' ))
'hello world''hello world'
>>>>>> #PEP 3101 style#PEP 3101 style
>>>>>> "{0} {1}""{0} {1}" . format(. format( 'hello''hello' ,, 'world''world' ))
'hello world''hello world'
>>>>>> ''' Comment string''' Comment string
.….… multiline! '''multiline! '''
>>>>>>

sequences
{Set}
{Dict}
[List]
(tuple)

function
defdef add_numadd_num(x, y=1):(x, y=1):
'''Get x, y and return:'''Get x, y and return:
X + Y '''X + Y '''
returnreturn x + yx + y
>>>>>> printprint add_num(2, 3)add_num(2, 3)
55
>>>>>> printprint add_num(2)add_num(2)
33

function
defdef add_numadd_num(x, y):(x, y):
X + Y '''X + Y '''
z = x + yz = x + y
returnreturn zz
>>>>>> printprint add_num(2, 3)add_num(2, 3)
55

def
defdef add_num(x, y):add_num(x, y):
X + Y '''X + Y '''
z = x + yz = x + y
return zreturn z
>>> print add_num(2, 3)>>> print add_num(2, 3)
55

name
defdef add_numadd_num(x, y):(x, y):
X + Y '''X + Y '''
z = x + yz = x + y
return zreturn z
55

parameters
def add_numdef add_num(x, y)(x, y)::
X + Y '''X + Y '''
z = x + yz = x + y
return zreturn z
55

: + indent
def add_num(x, y)def add_num(x, y)::
--------'''Get x, y and return:'''Get x, y and return:
-------- X + Y '''X + Y '''
--------z = x + yz = x + y
--------return zreturn z
55

documentation
def add_num(x, y):def add_num(x, y):
X + Y '''X + Y '''
z = x + yz = x + y
return zreturn z
55

body
X + Y '''X + Y '''
z = x + yz = x + y
return zreturn z
55

return
X + Y '''X + Y '''
z = x + yz = x + y
returnreturn zz
55

naming
Lowercase
don't
start
with
numbers
verb

naming
Lowercase
don't
start
with
numbers
verb
SEE PEP 8

documentation
X + Y '''X + Y '''
z = x + yz = x + y
return zreturn z
>>>>>> helphelp(add_num)(add_num)
Help on function add_num in module __main__:Help on function add_num in module __main__:
add_num()add_num()
Get x,y and return:Get x,y and return:
X + YX + Y
(END)(END)

KLAz
classclass StudentStudent((objectobject):):
defdef __init____init__ ((self,self, namename):):
self.self.name = namename = name
defdef print_nameprint_name ((selfself):):
printprint self.self.namename

KLAz
classclass Student(object):Student(object):
def __init__ (self, name):def __init__ (self, name):
self.name = nameself.name = name
def print_name (self):def print_name (self):
print self.nameprint self.name

name
classclass StudentStudent(object):(object):

type
class Studentclass Student((objectobject))::

: + indent
class Student(object)class Student(object)::
----def __init__ (self, name):def __init__ (self, name):
--------self.name = nameself.name = name
----def print_name (self):def print_name (self):
--------print self.nameprint self.name

__Init__ method
class Student(object):class Student(object):
defdef __init____init__ ((self,self, namename):):
self.self.name = namename = name

self
class Student(object):class Student(object):
def __init__ (def __init__ (selfself, name):, name):

Sub-KLAz
classclass KharKhoonKharKhoon(Student):(Student):
defdef print_nameprint_name ((selfself):):
printprint self.self.name +name + '' CRAMer '''' CRAMer ''
>>>>>> m = KharKhoon(“ahmad”)m = KharKhoon(“ahmad”)
>>>>>> m.print_name()m.print_name()
ahmad CRAMerahmad CRAMer

naming
CamelCase
don't
start
with
numbers
Nouns

while
>>>>>>whilewhile b < 10:b < 10:
…… printprint bb
…… a, b = b, a+ba, b = b, a+b
……
11
11
22
33
55
88

while
>>>>>>whilewhile b < 10:b < 10:
…… print bprint b
…… a, b = b, a+ba, b = b, a+b
……
11
11
22
33
55
88

while
>>>while>>>while b < 10b < 10::
…… a, b = b, a+ba, b = b, a+b
……
11
11
22
33
55
88

while
>>>while b < 10>>>while b < 10::
……--------print bprint b
……--------a, b = b, a+ba, b = b, a+b
……
11
11
22
33
55
88

while
>>>while b < 10:>>>while b < 10:
…… printprint bb
…… a, b = b, a+ba, b = b, a+b
……
11
11
22
33
55
88

while
>>>while b < 10:>>>while b < 10:
…… a,a, b =b = b,b, a+ba+b
……
11
11
22
33
55
88

forever
>>>>>>whilewhile 1:1:
…… passpass

if
>>>>>>ifif b < 10:b < 10:
…… ifif b > 8:b > 8:
…… printprint '9''9'

if
>>>>>>ifif b < 10b < 10 andand b > 8:b > 8:

if
>>>>>>ifif 8 < b < 108 < b < 10::

if-else
>>>>>>ifif b >= 10:b >= 10:
…… printprint 'big''big'
…… elifelif b =< 8:b =< 8:
…… printprint 'small''small'
…… elseelse::

if-else
>>>>>>ifif b >= 10:b >= 10:
…… print 'big'print 'big'
…… elif b =< 8:elif b =< 8:
…… print 'small'print 'small'
…… else:else:
…… print '9'print '9'

if-else
>>>if>>>if b >= 10b >= 10::
…… elif b =< 8:elif b =< 8:
…… else:else:

if-else
>>>if b >= 10>>>if b >= 10::
……--------print 'big'print 'big'
…… elif b =< 8:elif b =< 8:
……--------print 'small'print 'small'
…… else:else:
……--------print '9'print '9'

if-else
>>>if b >= 10:>>>if b >= 10:
…… printprint 'big''big'
…… elif b =< 8:elif b =< 8:
…… else:else:

if-else
>>>if b >= 10:>>>if b >= 10:
…… elifelif b =< 8:b =< 8:
…… else:else:

if-else
>>>if b >= 10:>>>if b >= 10:
…… elifelif b =< 8b =< 8::
…… else:else:

if-else
>>>if b >= 10:>>>if b >= 10:
…… elif b =< 8:elif b =< 8:
…… else:else:

if-else
>>>if b >= 10:>>>if b >= 10:
…… elif b =< 8:elif b =< 8:
…… elseelse::

for
>>>>>> forfor nn inin [2, 3, 4, 5, 6, 7, 8, 9]:[2, 3, 4, 5, 6, 7, 8, 9]:
…… forfor xx inin rangerange(2, n):(2, n):
…… ifif n % x == 0:n % x == 0:
...... printprint nn
...... breakbreak
...... elseelse::
...... printprint n,n, 'is a prime''is a prime'

for
>>>>>> forfor n in [2, 3, 4, 5, 6, 7, 8, 9]:n in [2, 3, 4, 5, 6, 7, 8, 9]:
…… for x in range(2, n):for x in range(2, n):
…… if n % x == 0:if n % x == 0:
...... print nprint n
...... breakbreak
...... else:else:
...... print n, 'is a prime'print n, 'is a prime'

for
>>> for>>> for nn in [2, 3, 4, 5, 6, 7, 8, 9]:in [2, 3, 4, 5, 6, 7, 8, 9]:
…… if n % x == 0:if n % x == 0:
...... breakbreak
...... else:else:

for
>>> for n>>> for n inin [2, 3, 4, 5, 6, 7, 8, 9]:[2, 3, 4, 5, 6, 7, 8, 9]:
…… if n % x == 0:if n % x == 0:
...... breakbreak
...... else:else:

for
>>> for n in>>> for n in [2, 3, 4, 5, 6, 7, 8, 9][2, 3, 4, 5, 6, 7, 8, 9]::
…… if n % x == 0:if n % x == 0:
...... breakbreak
...... else:else:

for
>>> for n in [2, 3, 4, 5, 6, 7, 8, 9]:>>> for n in [2, 3, 4, 5, 6, 7, 8, 9]:
…… forfor xx inin rangerange(2, n):(2, n):
…… ifif n % x == 0:n % x == 0:
...... printprint nn
...... breakbreak
...... elseelse::
...... printprint n,n, 'is a prime''is a prime'

for
>>> for n in [2, 3, 4, 5, 6, 7, 8, 9]:>>> for n in [2, 3, 4, 5, 6, 7, 8, 9]:
…… for x infor x in rangerange(2, n)(2, n)::
…… if n % x == 0:if n % x == 0:
...... breakbreak
...... else:else:

for
>>> for n in [2, 3, 4, 5, 6, 7, 8, 9]:>>> for n in [2, 3, 4, 5, 6, 7, 8, 9]:
…… if n % x == 0:if n % x == 0:
...... breakbreak
...... else:else:

for
>>>>>> dict = {dict = { 'a''a':1 ,:1 , 'b''b'::'AB''AB',, 'c''c':[1,{}] }:[1,{}] }
>>>>>>forfor key, valkey, val inin dict.items()dict.items()::
…… printprint key, valkey, val
a 1a 1
b ABb AB
c [1,{}]c [1,{}]

Input file
>>>>>>fin = (fin = ('foo.txt''foo.txt'))
>>>>>>forfor lineline inin finfin::
…… printprint lineline
>>>>>>fin.close()fin.close()

Input file
>>>>>>fin = (fin = ('foo.txt''foo.txt'))
>>>for line in fin:>>>for line in fin:
…… print lineprint line
>>>fin.close()>>>fin.close()

Input file
>>>fin = ('foo.txt')>>>fin = ('foo.txt')
>>>>>>forfor lineline inin finfin::
…… printprint lineline
>>>fin.close()>>>fin.close()

Input file
>>>fin = ('foo.txt')>>>fin = ('foo.txt')
>>>for line in fin:>>>for line in fin:
…… print lineprint line
>>>>>>fin.close()fin.close()

Output file
>>>>>>fout = (fout = ('foo.txt''foo.txt',,'w''w'))
>>>>>>fout.writefout.write(('Hello world!''Hello world!'))
>>>>>>fout.close()fout.close()

Output file
>>>>>>fout = (fout = ('foo.txt''foo.txt',,'w''w'))
>>>fout.write('Hello world!')>>>fout.write('Hello world!')
>>>fout.close()>>>fout.close()

Output file
>>>fout = ('foo.txt','w')>>>fout = ('foo.txt','w')
>>>>>>fout.write(fout.write('Hello world!''Hello world!'))
>>>fout.close()>>>fout.close()

Output file
>>>fout = ('foo.txt','w')>>>fout = ('foo.txt','w')
>>>fout.write('Hello world!'>>>fout.write('Hello world!'))
>>>>>>fout.close()fout.close()

trace
>>>>>>importimport pdbpdb
>>>>>>pdb.run(pdb.run('my_func()''my_func()'))
OrOr
python -m pdb myscript.pypython -m pdb myscript.py

trace
●● h - helph - help
●● s - step intos - step into
●● n - nextn - next
●● c - continuec - continue
●● w - where am I (in stack)?w - where am I (in stack)?
●● l - list code around mel - list code around me

trace
hh - helphelp
ss - step into- step into
nn - next- next
cc - continue- continue
ww - where am I (in stack)?- where am I (in stack)?
ll - list code around me- list code around me

trace
trytry::
f =f = openopen(arg, 'r')(arg, 'r')
exceptexcept IOErrorIOError::
printprint 'cannot open''cannot open', arg, arg
elseelse::
printprint argarg
f.close()f.close()

Dir & help
>>>>>> dirdir([])([])
['__add__', '__class__',['__add__', '__class__',
'__contains__',...'__contains__',...
'__iter__',... '__len__',... ,'__iter__',... '__len__',... ,
'append', 'count','append', 'count',
'extend', 'index', 'insert','extend', 'index', 'insert',
'pop', 'remove','pop', 'remove',
'reverse', 'sort']'reverse', 'sort']

Python Doc
http://www.python.org/doc/

M.L
general@tehpug.pyiran.com
Pyiran Mailing list

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