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Commit e086973

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‎Tutorials/Dictionary_Calculations.py‎

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stocks = {
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'GOOG' : 434,
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'AAPL' : 325,
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'FB' : 54,
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'AMZN' : 623,
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'F' : 32,
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'MSFT' : 549
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}
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print(min(zip(stocks.values(), stocks.keys())))
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from operator import itemgetter
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users = [
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{'fname': 'Bucky', 'lname': 'Roberts'},
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{'fname': 'Tom', 'lname': 'Roberts'},
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{'fname': 'Bernie', 'lname': 'Zunks'},
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{'fname': 'Jenna', 'lname': 'Hayes'},
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{'fname': 'sally', 'lname': 'Jones'},
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{'fname': 'Amanda', 'lname': 'Roberts'},
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{'fname': 'Tom', 'lname': 'Williams'},
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{'fname': 'Dean', 'lname': 'Hayes'},
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{'fname': 'Bernie', 'lname': 'Barbie'},
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{'fname': 'Tom', 'lname': 'Jones'}
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]
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# How to sort when there are more than 1 keys
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for x in sorted(users, key = itemgetter('fname')): # keyword 'sorted' takes in 3 values: 1. the dictionary 2. the key 3. reverse = True/False
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# 'itemgetter' allows us to fetch the keyword with which we want to sort the items in the given dictionary
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print(x) # But the problem here is it sorts the 1st name accordingly bt the last names aren't sorted
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print('______________________________________\n')
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# How to fix this problem
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for x in sorted(users, key = itemgetter('fname', 'lname')): # Here we can even use 2 keys, but the 1st one will be given preference
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print(x)

‎Tutorials/bitwise_operators.py‎

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# ------ Binary AND ------
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a = 50 # 110010
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b = 25 # 011001
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c = a & b # 010000 = 16
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# '&' is a binary operator
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print(c)
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# ------ Binary RIGHT SHIFT ------
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x = 240 # 11110000
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y = x >> 2 # 00111100 = 60
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# Every bit shifted 2 places to the right
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print(y)
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# ------ Binary LEFT SHIFT ------
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z = x << 4 # 00001111
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print(z)
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# ------ Binary OR ------
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d = a | b # 111111
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print(d)
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# ------ Binary compliment ------
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e = ~x
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print(e)
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# ------ Binary XOR ------
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f = a ^ b #101011
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print(f)

‎Tutorials/break_continue.py‎

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'''
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this is used to add a comment line
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or a set of lines that the computer ignores
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'''
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# this is used to add a single comment line
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print("this is used to" + " concatenate 2 strings")
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'''
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a string and a number cannot be concatenated this way
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instead we can use a comma to separate the two different data types'''
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print(9, ' aousnik')
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#BREAK AND CONTINUE::
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magicNumber = 26
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for x in range(101):
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if x is magicNumber:
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print(x," is a magic number")
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#once 26 is found it prints the number and breaks the loop
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break
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else:
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print(x)
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#prints the number anyways
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'''numbers till 100 divisibe by 4'''
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print('\n')
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for i in range(1, 101):
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x = i%4
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if x is 0:
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print(i)
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class Girl:
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gender = 'female' # class variable which is common to all
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def __init__(self, name):
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self.name = name # instance variable which is unique to a name
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a = Girl('Rachel') # this is the way to assign a value to the function when a parameter is present
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b = Girl('Stanky')
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print(a.gender)
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print(b.gender)
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print(a.name)
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print(b.name)
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‎Tutorials/classes_objects.py‎

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# Enemy attack game
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class Enemy:
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life = 3
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def attack(self):
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print("Enemy says - Ouch !!")
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self.life -= 1 # to access variables inside the class itself
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def checklife(self):
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if self.life <= 0:
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print("Enemy says - I'm dead")
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else:
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print(str(self.life) + " life left")
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# now to access anything that's inside this class, we need to create an object
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enemy1 = Enemy() # Object initialisation
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#objects are basically the copies of a class
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enemy2 = Enemy()
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enemy1.attack()
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enemy1.attack() # basically the functions on enemy 1 doesnt affect enemy 2
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enemy1.checklife()
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enemy2.checklife()
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# so by writing just once, we can create 2 instances to run the class twice 'parallelly and independently'
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‎Tutorials/continue.py‎

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numbers = [2, 5, 12, 13, 17]
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for x in range(1, 20):
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if x in numbers:
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continue
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print(x)

‎Tutorials/default_values.py‎

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def get_gender(gender = 'Unknown'):
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if gender is 'm':
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gender="male"
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elif gender is 'f':
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gender='female'
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print("Gender is ", gender)
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get_gender('m')
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get_gender('f')
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get_gender()
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def sentence(name = 'Aousnik', gender = 'male', category = 'general'):
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print(name, gender, category)
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sentence('abcd', 'female', 'SC')
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sentence(category = 'ST')
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sentence(gender = 'other')
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sentence()

‎Tutorials/dictionary.py‎

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classmates = {'Rono':' ghaora', 'Sohom':' Chutiya', 'Rudra':' Derchokho'}
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# classmates is the dictionary with some words with values
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print(classmates) # this prints the whole thing as it is
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print(classmates['Rono']) # it prints the value 'Rono' assigned
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for k in classmates:
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#k->keywords, v->values
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print(k)
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# prints all the keywords spaced with values
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''' .items() keyword is used to go through all the items in the dictionary created'''

‎Tutorials/download_files.py‎

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# to download data/csv files from the internet
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import urllib.request
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goog_url = "http://insight.dev.schoolwires.com/HelpAssets/C2Assets/C2Files/C2ImportCalEventSample.csv"
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def data_analysis(csv_url):
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response = urllib.request.urlopen(csv_url) # response opens the data
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csv = response.read() # reads the data in the url
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csv_str = str(csv) # converts all the data into string
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lines = csv_str.split("\\n") # \\n splits the whole string into different lines accordingly
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# of course we dont want all the string in the url in one whole line
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destination = r'goog.csv' #destination of the file
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fx = open(destination, "w") #to open up the file
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for line in lines: # to write in the file
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fx.write(line + "\n")
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fx.close()
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data_analysis(goog_url)
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