Begin with Python

COURSE OUTLINE
Installing and Using Python
Basic I/O
Variables and Expressions
Conditional Code
Functions
Loops and Iteration
Python Data Structures
Errors and Exceptions
Object Oriented with Python
Multithreaded Programming with Python
Install/Create and Using Python Library
Compile Python Script
Resources

INSTALLATION PYTHON INTERPRETER
▸ Download : https://www.python.org/downloads/ 
(Python 3.5.2)
▸ Install
PREPARATION

▸ For Windows : https://docs.python.org/3/using/windows.html
PREPARATION

▸ Install Location (Widows) :
PREPARATION
C:User<name>ProgramsAppDataLocalProgramsPythonPython35-32
▸ Install Location (OSX)
/usr/bin/python

INSTALLATION PYTHON IDE
▸ Download and install pip: https://pip.pypa.io/en/stable/installing/ 
 
 
 
 
 
 
▸ Install Jupyter IDE : http://jupyter.readthedocs.io/en/latest/
install.html
PREPARATION
( pip install jupyter )

RUN JUPYTER
PREPARATION
Jupyter: http://localhost:8888
>> jupyter-notebook
Goto : localhost:8888

BASIC I/O
“ Hello World “
> text = input(“Enter text”)
> x = int(input(“Enter text”))
> print(“hello”)
> print(10)
> print(text)
> print(“{}”.format(x))
> print(“%s”.%(x))
Input
Output
Input()
print()

VARIABLES AND EXPRESSIONS
> pi = pi + 1
> number += 1
> text = text + “haha”
> n = 2 + 2 * 2 - 5
n ?
Dynamics Variable
Expression
> a = 1
> a = “1”
> a = 1.0
> a = f()

Variable types
boolean : True/False
ﬂoat : 0.1
int : 100
string : “hello”

>> type()

Quiz Time “ Let me introduce myself “
FRIST NAME:
LAST NAME:
AGE:
GENDER:
TEL:
WEIGHT (KG.):
HEIGHT (CM.) :
MY NAME IS ________________.
I AM _________ YEARS OLD.
I AM A _________.
MY PHONE NO. IS ______________.
MY WEIGHT IS ________________KG. (~_________ LB.)
MY HEIGHT IS ________________CM. (~__________M.)
Input:
Output:
10 Min. Q1
*1 kg = 2.205 lb

CONDITIONAL CODE
Syntax
if <condition> :
statment(s)
elif <condition> :
statment(s)
else :
statment(s)
Comparators
> , < , >= , <=, not, !=
Operators
A & B , A and B
A | B , A or B
Syntax
short if
x = <true> if <condition> else <false>

CONDITIONAL CODE
Example
if (5 > 10) | (10 > 15) & ( 1 != 1) :
print(False)
elif (10 > 5) & (not(False)):
print(True)
else:
print(NULL)
Example (short if)
x = 5 if 5 > 10 else 10

CONDITIONAL CODE
Quiz Time “ What is my BMI level ?“
FRIST NAME:
LAST NAME:
AGE:
GENDER:
TEL:
WEIGHT (KG.):
HEIGHT (CM.) :
MY NAME IS ________________.
I AM _________ YEARS OLD.
I AM A _________.
MY PHONE NO. IS ______________.
MY WEIGHT IS ________________KG. (~_________ LB.)
MY HEIGHT IS ________________CM. (~__________M.)
MY BMI IS : __________________.
Input:
Output:
5 Min. Q2
*1 kg ~ 2.205 lb

LOOPS AND ITERATION
range 
#generate number
range(5) ==> [0,1,2,3,4] 
range(0,10,2) ==> [0,2,4,6,8] 
range(0,10,5) ==> [0,5]

LOOPS AND ITERATION
enumerate
#generate index i start from 0
for i, n in enumerate(<iterator object>): 
statement(s)
Example
for i, n in enumerate(range(0,10,5)): 
pow = n ** i
print(pow)
1 
5

LOOPS AND ITERATION
Syntax
for…
for n in <iterator object>: 
statement(s) 
 
while..
while(<conditions>): 
statement(s) 
Examples
for…
for n in range(10): 
print(n ** n) 
while..
while(True): 
break 
for n in <iterator object>:
…….

LOOPS AND ITERATION
break
#exit loop
break
continue
#next loop
continue
pass
#pass
while True 
pass

LOOPS AND ITERATION
Syntax
for…
statement(s) 
while..
while(<conditions>): 
statement(s) 
range 
#generate index number
range(5) ==> [0,1,2,3,4] 
range(0,10,2) ==> [0,2,4,6,8]
enumerate
#generate index i start from 0
for i, n in enumerate(<iterator object>): 
statement(s)
break
#exit loop
break
continue
#next loop
continue

FUNCTIONS
Syntax
def <function name>(args) :
statement(s)
statement(s)
return <value>
statement(s)
yield <value>
return
return 0 
return 1
g = make_generator()
print(g)
0

FUNCTIONS
Argument
def <function name>(x, y) : 
statement(s)
Argument : Default value
def foo(x = 1, y = 2) : 
statement(s)
Call function and parse values
fn(3,2) #args
fn(x = 2, y = 1) #kwargs
Argument : *args, **kwargs
def fn(x = 1, y = 2, *args) 
def fn(x = 1, y = 1, **kwargs) 
def fn(x = 1, y = 1,*args, **kwargs)

FUNCTIONS
Return
def <function name>(x, y) :
statement(s)
return value
Return
def <function name>(x, y) :
statement(s)
return value1, value2,…
Return values
x , y = minmax(x,y)
Example
def add(x, y) :
a = x + y
return a
Example
def minmax(x, y) : 
if x == y: 
return None, None
mi = x if x < y else y 
ma = x if x > y else y
return mi, ma

FUNCTIONS
Example
def BMI(weight=None, height =None):
bmi = weight / (height ** 2)
return bmi
bmi = BMI(10,1.67)

FUNCTIONS
#Variable scope
r = 1 
for a in range(10): 
r = 3 
for i in range(5): 
r = 8
print(r) ????
#Variable scope
a = 5 
def var(): 
print(a) 
var() ????
#Variable scope
a = 5 
def var(): 
a += 5 
print(a) 
var() ????

FUNCTIONS
#Variable scope
a = 5 
def var(): 
global a 
a += 5 
print(a) 
var() ????
“UnboundLocalError: local variable 'a' referenced before assignment“

FUNCTIONS
Quiz Time
10 Min. Q3
“ What is my BMI level? : Function Version“
F1 : getInfo() #get user information and return informations
 
F2 : BMI(…. , ……) #calculate and return BMI level 
F3 : showInfo(…,….,…,..) #display summary information 
# get information, calculate BMI and display of N users
F4 : getNInfo(n)

FUNCTIONS
#main program
import bmi
bmi.getInfo() 
bmi.BMI(weight,height) 
bmi.showInfo()
#External function 
#bmi.py
def getInfo(): 
……… 
def BMI(weight,height): 
…….. 
def showInfo(….,..,.…): 
………
#main program
from bmi import bmi
bmi.getInfo() 
bmi.BMI(weight,height) 
bmi.showInfo()
# External module function 
# bmi/bmi.py
def getInfo(): 
……… 
def BMI(weight,height): 
…….. 
def showInfo(….,..,.…): 
………

PYTHON DATA STRUCTURES

- LIST
- TUPLE 
- SET 
- DICT 
- FILE

List
[1,2,3,4,5,6,7,8,9,10]
_list = [1, ”A”, [1], 1.0] #multiple type in one list object
a = _list[0] #access one element
b = _list[0:3] #access multiple elements
_list.append(10) #add new element
_list.pop(), _list.pop(index) #remove using index
_list.remove(value) #remove using value

Using Lists as Stacks
stack = [3, 4, 5] 
stack.append(6) 
stack.append(7) 
print(stack) 
 
stack.pop() 
print(stack) 
 
stack.pop() 
stack.pop() 
print(stack)

Using Lists as Queues
from collections import deque
queue = deque(["Eric", "John", "Michael"]) 
queue.append("Terry")  
queue.append("Graham")  
queue.popleft()  
queue.popleft()  
print(queue)

Add element
squares = []
for x in range(10): 
squares.append(x**2)
print(squares)

Generate list
squares = [x**2 for x in range(10)]
squares = list(map(lambda x: x**2, range(10)))
map
map( lambda <> , <>, <input>) #~ short for

Nested List
matrix = [
[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12],
]

Access Nested List
for i in matrix:
for j in i:
print(j)
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12

Transpose List
list(zip(*matrix))
[(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)]
len() #ﬁnd size of list
len([1,2,3,4,5,6,7,8,9])
9

sum(), min(), max()
a = [1,2,3,4,5,6,7,8,9,10] 
print(sum(a), min(a), max(a))
55 1 10
sorted
a = [10,2,3,4,5,6,7,8,9,1] 
print(sorted(a))
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Concat List
a = [1,2,3,4] 
b = [5,6,7,8,9] 
c = a + b
print(c)
[1,2,3,4,5,6,7,8,9]

del #remove list or elements list
a = [-1, 1, 66.25, 333, 333, 1234.5]
del a[0] 
del a[2:4] 
del a[:] 
del a #remove variable “a” from memory

FUNCTIONS
Quiz Time
10 Min. Q4
“ STATISTICS Time“
1. Loop for get 10 numbers from input and insert to list
2. Create function for calculate:  
- Mean (Average)  
- Min 
- Max 
- Variance #calculate from the equation only
3. Show values
http://www.mathsisfun.com/data/standard-deviation.html

Tuple #sequence data
(1,2,3,4,5,6,7,8,9,10)
_tuple = 4,5,6,[1],"hello" #multiple type in one Tuple object
a = _tuple[0] #access one element
b = _tuple[0:3] #access multiple elements
_tuple.count(x) #count number of x in tuple
_tuple.index(x) #ﬁnd index of x in tuple
_tuple[0] = 1 #cannot edit element value in tuple

Concat Tuple
a = 1,2,3,4,5,6,[1],”hello"
a += tuple([100])
print(a)
(1, 2, 3, 4, 5, 6, [1], 'hello', 100)

List to Tuple
t = tuple([1,2,3,4,5,6])
print(t)
(1, 2, 3, 4, 5, 6)
print format using tuple
print(“%s > %s ” %(50,10) )
50 > 10

Sets
{'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
_set = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
#multiple type in one set object
a = _set.pop() #get ﬁrst element of set
_set.remove(x) #remove element x
_set.add(x) #add new element
len(_set) #get size of set

_set.intersection(a) #get intersect element on set a
_set.issubset(a) #Is subset of set a?
_set.difference(a) #get difference element from set a
_set.union(a) #get union element with set a

Sets
a = {'apple', 'orange', 'apple', 'pear', 'orange', ‘banana'} 
print(a)
{'apple', 'orange', 'banana', 'pear'}
a = set(“ABCDEFG”) 
print(a)
{'E', 'B', 'A', 'F', 'G', 'C', 'D'}

a = set([4,5,1,2,3]) 
print(a)
{1, 2, 3, 4, 5} #element will be sorted automatically
a = set([4,5,1,2,3]) 
b = set([4,5,1]) 
print(a.intersection(b))
{1, 4, 5}

Quiz Time
5 Min. Q5
“ Like Number “
Similarity?

Quiz Time
5 Min. Q5
“ Like Number “
{11, 2, 3, 4, 15, 6, 7, 8, 9, 10} {15, 2, 3, 4, 15, 6, 17, 8, 19, 10}
Choose 10 numbers between 0 - 20

Quiz Time
5 Min. Q5
“ Like Number “

Quiz Time
5 Min. Q5
“ Similar Like Number “
IR = {11, 2, 3, 4, 15, 6, 7, 8, 9, 10}
CA = {15, 2, 3, 4, 15, 6, 17, 8, 19, 10}
SIM (IR,CA) = 0.58333

Quiz Time
5 Min. Q5
“ Like Number “
1. Get two set of numbers(10 numbers) from two users.
2. Create function for calculate Jaccard similarity
3. Display the similarity.

Dict
{'apple' : 0, 'orange' : 1, 'pear' : ‘Hello'} #key, value structure
_dict = {'apple' : 0, 'orange' : 1, 'pear' : ‘Hello'} #multiple type in
one dict object
_dict.pop() #get ﬁrst element of dict
_dict.keys() #get all key of dict
_dict.values() #get all value of dict
_dict[index] = x #add new element to dict (key,value)
len(_dict) #get size of dict

a = {'apple' : 0, 'orange' : 1, 'pear' : ‘Hello'} 
print(a[‘apple’])
0
a = {'apple' : 0, 'orange' : 1, 'pear' : ‘Hello'} for k in a: 
print(a[k])
0 
1 
‘hello’

a = {'apple' : 0, 'orange' : 1, 'pear' : ‘Hello'}  
print(a.values())
dict_values([0, 1, 'Hello'])
a = {'apple' : 0, 'orange' : 1, 'pear' : ‘Hello'} 
print(a.keys())
dict_keys(['apple', 'orange', 'pear'])

File
f = open(<filename>,’r’) #open file for read
f = open(<filename>,’w’) #open file for write new
f = open(<filename>,’a’) #open file for write append
f.readline() #read next line
f.readlines() #read all lines
f.close() #read all lines

file.txt 
My name is python. 
I am a programmer. 
I have no life.
with open(“file.txt” , ’r’) as f: 
first = f.readline() 
for line in f: 
print(line)
My name is Python.
I am a programmer.
I have no life.

ﬁle.txt 
I have no life.
with open(“ﬁle.txt” , ’r’) as f: 
lines = f.readlines() 
print(lines)
['My name is Python.n', 'I am a programmer.n', 'I have no life.']

with open(“write.txt” , ’w’) as f: 
f.write(“Hellon”)
write.txt
 
Hello
with open(“write.txt” , ’a’) as f: 
f.write(“Worldn”) 
write.txt 
 
Hello 
World

ﬁle.txt 
I have no life.
f = open(“ﬁle.txt” , “r”) 
lines = f.readlines() 
print(lines) 
f.close()
['My name is Python.n', 'I am a programmer.n', 'I have no life.']

String
str = “hello world” #create string
len(str) #get string length
str[i:j] # get string from index i to index j - 1
str[i] #get character at index i
str.replace(str1,str2) #replace str1 with str2 in string str
https://docs.python.org/2/library/string.html
str.splite(sep) #split string by string sep

str = “Hello world”
print(len(str))
11
print(str[0:3])
Hel

print(str.replace(“o”,”_”))
Hell_ w_rld
print(str.split(“ ”))
['Hello', 'world']

Quiz Time
10 Min. Q6
“ Word Count “
ﬁle.txt 
 
My name is python 
I am a programmer 
I have no life
I : 2 
my : 1 
name : 1 
is : 1 
……..
1. Use dictionary structure to store words and count number
each word in the document.
2. Show output , by using print command to show values in 
dictionary Ex. print(dict).

ERROR AND EXCEPTION
ERROR AND EXCEPTION

ERROR AND EXCEPTION
try:
...
except SomeException:
e = sys.exc_info()[1]
print(e)
https://docs.python.org/3/library/exceptions.html

ERROR AND EXCEPTION
import sys
try:
str = "hello"
print(str[100])
except:
tb = sys.exc_info()[1]
print(tb)
string index out of range

ERROR AND EXCEPTION
Input validation
while(True):
try:
n = int(input("age : "))
break
except:
print("Age is invalid, please try agian.")

Quiz Time “ Input validation “
FRIST NAME:
LAST NAME:
AGE:
GENDER:
TEL:
WEIGHT (KG.):
HEIGHT (CM.) :
5 Min. Q7
Create function for validate input value

OBJECT ORIENTED WITH PYTHON

class ClassName:
'Optional class documentation string'
class_suite
https://www.tutorialspoint.com/python/python_classes_objects.htm
1. The class has a documentation string, which can be accessed  
via ClassName.__doc__.
2. The class_suite consists of all the component statements deﬁning class members,  
data attributes and functions

class Employee:
'Common base class for all employees'
empCount = 0  
def __init__(self, name, salary):
self.name = name
self.salary = salary
Employee.empCount += 1 
def displayCount(self):
print("Total Employee %d") % Employee.empCount

Creating Instance Objects
 
emp1 = Employee("Zara", 2000) 
emp2 = Employee("Manni", 5000)
Accessing Attributes
 
emp1.displayEmployee()
emp2.displayEmployee()
print "Total Employee %d" % Employee.empCount

Class Inheritance 
 
class SubClassName (ParentClass1[, ParentClass2, ...]):
'Optional class documentation string'
class_suite

class Parent:
parentAttr = 100
def __init__(self): 
print(“Calling parent constructor”) 
def parentMethod(self): 
print(‘Calling parent method’) 
def setAttr(self, attr): 
Parent.parentAttr = attr
def getAttr(self): 
print(“Parent attribute :", Parent.parentAttr)
class Child(Parent):
def __init__(self):
print(“Calling child constructor”)
def childMethod(self):
print(‘Calling child method’)
Accessing
 
c = Child() # instance of child 
c.childMethod()  
c.parentMethod()  
c.setAttr(200)  
c.getAttr()

Overriding Methods
class Parent:  
def myMethod(self): 
print 'Calling parent method' 
class Child(Parent): 
def myMethod(self): 
print 'Calling child method'
c = Child() # instance of child
c.myMethod() # child calls overridden method

Data Hiding
 
class JustCounter: 
__secretCount = 0 #add double underscore preﬁx
def count(self): 
self.__secretCount += 1 
print self.__secretCount
counter = JustCounter() 
counter.count() 
counter.count() 
print counter.__secretCount
AttributeError: JustCounter instance has no attribute '__secretCount'

Quiz Time
10 Min. Q8
“ My Car“
Create class of a car

MULTITHREADED PROGRAMMING

Background Executor
thread.start_new_thread ( function, args[, kwargs] )
import thread 
import time
# Deﬁne a function for the thread 
def print_time( threadName, delay): 
count = 0 
while count < 5: 
time.sleep(delay) 
count += 1 
print "%s: %s" % ( threadName, time.ctime(time.time()) )
# Create two threads as follows 
try: 
thread.start_new_thread( print_time, ("Thread-1", 2, ) ) 
thread.start_new_thread( print_time, ("Thread-2", 4, ) ) 
except: 
print "Error: unable to start thread"
while 1: 
pass

Parallele Processing
p = Pool(<Number of Executor>) 
p.map(<function>,data)
from multiprocessing import Pool
def f(x): 
return x*x 
 
p = Pool(5) 
ans = p.map(f, [1, 2, 3])
[1, 4, 9]
- Use it if you have more than one/two cores on your computer and 
more data point, overhead will occur when start new thread

INSTALL/CREATE AND USING PYTHON LIBRARY
INSTALL/CREATE AND USING
PYTHON LIBRARY

“ pip install <packet name> ”
install via pip
Ex. pip install pickle
pickle.dump() 
pickle.load()

“ python setup.py install ”
install via source code
https://github.com/tomerﬁliba/rpyc

Using library
import <packet name>
from <packet folder name> import <packet name>
import time 
t = time.time()
from date time import datetime 
dt = datetime.now()

Where is library install path
import sys
sys.path
import time 
t = time.time()
from date time import datetime 
dt = datetime.now()

Remote Python Call
pip install rpyc or download add install via
“python setup.py install”
def printMe(text) printMe(text)

import rpyc 
from rpyc.utils.server import ThreadedServer
class MyService(rpyc.Service): 
def exposed_add(self, a, b): 
return a + b
def exposed_sub(self, a, b): 
return a - b
def exposed_mul(self, a, b): 
return a * b
def exposed_div(self, a, b): 
return a / b
def foo(self): 
print “foo"
 
if __name__ == "__main__": 
server =  
ThreadedServer(MyService, port = 12345)
server.start()
client slide
import rpyc
import rpyc
conn = rpyc.connect("localhost", 12345) 
x = conn.root.add(4,7) 
print(x)
server slide

COMPILE PYTHON SCRIPT

1. Goto source code directory
2. “ python -m compile all . “
Save time when load to execute again.

Begin with Python

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