PEMDAS :parentheses//exponent //multiply // addition // subtraction // division
Conversion number to String

str(year)

print()

print("i m here");

str = "i m here";

print(str);

print(str," will be there");

print("Hello's "); // use double quotes when using num

title ="\n\t roo rooo roo roo roo !"

print("Song: ",title);

print(len(str));
will print length of string

Slice Operation

PYTHON :

PYTHON[2:5]
PYTHON[:2]
PYTHON[2:]

Integer Division

result = number1//number2
https://www.python.org/dev/peps/pep-0008/

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rain_speed =7;
if rain_speed < 5:

print("Just a Scotch mist")
else:

print("It's a real Cow-quaker out there")
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Conditional Operators :

and = &&
or = ||
equals = "=="

How to take user input ?

day = input('please enter your name');
print('you entered',day);

convert user input to number

day = int(input('please enter your name'));
print('you entered',day);

elif :

number = 5
if number < 5:
    print('Aloha')
elif number <= 10:
    print('Hola')
else:
    print('Konichiwa')

NOTE: THERE ARE NO SEMICOLONS IN PYTHON

computer_choice = 'python'
user_choice = input("Enter rock, paper, or python:\n")
if computer_choice == user_choice:
print('TIE')
else :
print("You lose :( Computer wins :D")

https://www.codeschool.com/account/courses/try-python

Performances [LIST]
ADDITION

performances = ['Ventriloquism','Amazing Acrobatics']
performances.append('Snake Charmer')
print(performances)

SUBTRACTION

performances = ['Ventriloquism', 'Amazing Acrobatics', 'Snake Charmer', 'Enchanted Elephants', 'Bearded Lady', 'Tiniest Man']
performances.remove('Bearded Lady')
['Ventriloquism', 'Amazing Acrobatics', 'Snake Charmer', 'Enchanted Elephants', 'Bearded Lady', 'Tiniest Man']
performances.remove('Tiniest Man')
print(performances)

Dictionary:

performances = {'Ventriloquism':'9:00am', 'Snake Charmer': '12:00pm'}

Adding to dictionary

performances['Amazing Acrobatics'] = '2:00pm'
performances['Enchanted Elephants'] = '5:00pm'
print(performances)

Removing to dictionary

performances.remove('Ventriloquism') --incorrect
del performaces['Ventriloquism']

Dictionary with performances

performances = {'Ventriloquism':'9:00am',
'Snake Charmer': '12:00pm',
'Amazing Acrobatics': '2:00pm',
'Bearded Lady':'5:00pm'}
showtime = performances.get('Bearded Lady');
if showtime == None:
print("Performance doesn't exist")
else:
print("The time of the Bearded Lady show is ",showtime)

Comparing and Combining

Comparing list

list_a = ['python', 'bison', 'lion']
list_b = ['python', 'lion', 'bison']

print(list_a == list_b)

Comparing dictionaries

dict_a = {'python':'reptile', 'bison':'mammal', 'lion':'mammal'}
dict_b = {'python':'reptile', 'lion':'mammal',  'bison':'mammal'}

print(dict_a == dict_b)

List Of List

performances = {'weekdays': ['Bearded Lady', 'Tiniest Man', 'Ventriloquist Vinnie'],
                'saturday': ['Amazing Acrobatics', 'Enchanted Elephants'],
                'sunday':   ['Snake Charmer', 'Amazing Acrobatics']}

performances['weekdays'][2]

LEVEL 2 :Looping

Package Random

For loop with range

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he built-in function range() to generate numbers from 0 to 19.

my_list = range(20)

import random
for i in range(5):
no =random.randint(1,53)

print(no)

Printing prices

for items in menu_prices
print(item) ------------------------> prints item names

Printing prices

for items in menu_prices.items()
print(item) ------------------------> prints prices

Printing key & value

for name,price in menu_prices.items()
print(name,'$ :', price ) ------------------------> prints prices

Printing key & value with space seperator

for name,price in menu_prices.items()

print(name,'$ :', price, sep=' ' ) ------------------------> prints prices

Printing key & value with space seperator & formatting

for name,price in menu_prices.items()

print(name, '$ :', format(price, 2.f), sep=' ' ) ------------------------> prints prices

performances = {'Ventriloquism':'9:00am',
'Snake Charmer': '12:00pm',
'Amazing Acrobatics': '2:00pm',
'Enchanted Elephants':'5:00pm'}
for show,showtime in performances.items():

print(show,": ",showtime,sep="")

The while loop

import random

num = random.randint(1,10)

guess = int(input('Guess a number between 1 and 10'))
times = 1
while guess != num:
times =times+1
if times==3:
break
guess = int(input('Guess again'))
if guess==num:
print('You win!')
else:

print('You lose! The number was ',num)

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LEVEL 3 : FUNCTIONS

import random

def lotto_numbers():
# code in the function goes here
lotto_nums =[]
for i in range(5):
lotto_nums.append(random.randint(1, 53))

return lotto_nums
numbers = lotto_numbers()

print(numbers)

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main

import random

def lotto_numbers():
lotto_nums = []
for i in range(5):
lotto_nums.append(random.randint(1, 53))

return lotto_nums

def main():
# code in the main function goes here
numbers = lotto_numbers()
print(numbers)

main()
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import random

def guessing_game():
num = random.randint(1, 10)
guess = int(input('Guess a number between 1 and 10'))
times = 1
while guess != num:
guess = int(input('Guess again'))
times += 1
if times == 3:
break

if guess == num:
print('You win!')
else:
print('You lose! The number was', num)


def lotto_numbers():
lotto_nums = []
for i in range(5):
lotto_nums.append(random.randint(1, 53))

return lotto_nums



def main():
guessing_game()
numbers = lotto_numbers()
print(numbers)


main()

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import random

def guessing_game():
num = random.randint(1, 10)

guess = int(input('Guess a number between 1 and 10'))
times = 1

while guess != num:
guess = int(input('Guess again'))
times += 1
if times == 3:
break

if guess == num:
print('You win!')
else:
print('You lose! The number was', num)


def lotto_numbers():
lotto_nums = []
for i in range(5):
lotto_nums.append(random.randint(1, 53))

return lotto_nums

def main():
answer =input('Do you want to get lottery numbers (1) or play the game (2) or quit (Q)?')
if(answer == '1'):
numbers = lotto_numbers()
print(numbers)
elif(answer == '2'):
guessing_game()
else:
print('Toodles!')

main()

WRITING TO FILES

LEVEL 3 : READING TO FILES

performances = {'Ventriloquism': '9:00am',
'Snake Charmer': '12:00pm',
'Amazing Acrobatics': '2:00pm',
'Enchanted Elephants': '5:00pm'}
#schedule_file = open('schedule.txt','a')
schedule_file = open('schedule.txt','w')

for key,val in performances.items():
schedule_file.write(key+' - '+val+'\n')

schedule_file.close()

schedule_file = open('schedule.txt', 'r')
for line in schedule_file:
(show,time) =line.split(' - ')
print(show,time)

schedule_file.close()

performances = {}

schedule_file = open('schedule.txt', 'r')

for line in schedule_file:
(show, time) = line.split(' - ')
print(show, time)
performances[show] = time.strip()

schedule_file.close()

print(performances)

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EXCEPTIONS

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LEVEL 4 : MODULES

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import requests

url = "http://api.openweathermap.org/data/2.5/weather?q=Orlando,fl&units=imperial&appid=2de143494c0b295cca9337e1e96b00e0"
request = requests.get(url)

weather_json = request.json()
weather_main = weather_json['main']
print(weather_json)
temp = weather_main['temp']
print("The Circus's current temperature is ",temp)
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Using Modules to access functions

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Additional Info:

Python has five standard data types −

Numbers
String
List == list
Tuple == collection
Dictionary == hashmap

How to clear screen in python

def cls(): print ("\n" * 100);

cls()

or simply

print ("\n" * 100);

Exercise :

Method	Description
Python Tuple count()	returns occurrences of element in a tuple
Python Tuple index()	returns smallest index of element in tuple
Python any()	Checks if any Element of an Iterable is True
Python all()	returns true when all elements in iterable is true
Python ascii()	Returns String Containing Printable Representation
Python bool()	Coverts a Value to Boolean
Python enumerate()	Returns an Enumerate Object
Python filter()	constructs iterator from elements which are true
Python iter()	returns iterator for an object
Python len()	Returns Length of an Object
Python max()	returns largest element
Python min()	returns smallest element
Python map()	Applies Function and Returns a List
Python reversed()	returns reversed iterator of a sequence
Python slice()	creates a slice object specified by range()
Python sorted()	returns sorted list from a given iterable
Python sum()	Add items of an Iterable
Python tuple() Function	Creates a Tuple
Python zip()	Returns an Iterator of Tuples

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Goals 2018 :

https://www.programiz.com/python-programming/methods/built-in

https://www.programiz.com/python-programming/methods/string/capitalize

https://see.stanford.edu/Course/CS229/47

Machine Learning : NLP & Python

Great Readings

https://www.analyticsvidhya.com/blog/2017/12/introduction-to-altair-a-declarative-visualization-in-python/

How to schedule python scripts

https://www.youtube.com/watch?v=3l9mYAMzpko

https://www.youtube.com/watch?v=iyv1iySErc0

Running python script as a service

https://www.youtube.com/watch?v=aXu6T4XfZGU

Convert PY to EXE

https://www.youtube.com/watch?v=lOIJIk_maO4

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Cosmi

Thursday, January 11, 2018

Machine Learning : Python

Comparing and Combining

Convert PY to EXE

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