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Author: Kalpak Take

listOperations.py

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+# list operations
+# You can create a list by putting elements inside square brackets[]
+# lists are capable of containing any type of data
+
+# a list can contain datas of different datatypes
+numsAndAlphas = ['a',1,'hello',3.14159265359,'are you okay',True,'good',False]
+# this is going to work
+print(numsAndAlphas)
+
+# list accessing
+# You can access single items from the list similar to string indexing
+# if you dont know string indexing look for my program called stringOperations.py
+print(numsAndAlphas[0])
+print(numsAndAlphas[1:5])
+print(numsAndAlphas[0:])
+print(numsAndAlphas[:6])
+print(numsAndAlphas[:])
+print(numsAndAlphas[2:7:2])
+print(numsAndAlphas[::3])
+
+# you can add lists too...
+list2 = [2,9,16,25,36,49,64,81,100,144]
+newList = numsAndAlphas + list2

listOperationsMethods.py

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+# list operations part 2
+
+siliconValley = ['Google','Apple','Dropbox','Facebook','Cisco','Adobe','Oracle','Samsung']
+print(siliconValley)
+
+# hmm seems like i forgot to add Electronic Arts in the list siliconValley
+# This will add the element at the end of the list
+siliconValley.append('Electronic Arts')
+print(siliconValley)
+
+# thats cool but I want my element at specific position
+siliconValley.insert(5, 'AMD')
+# 5 is the position and whatever you add after comma is element
+
+# Okay enough I want to pop out an element from list and I want to use it in a string
+# you have to provide the index of elementyou want to pop out
+poppedElement = siliconValley.pop(4)
+print('Popped element is ' + poppedElement)
+
+# Oops I Samsung isnt in silicon valley, I have to remove Samsung from list
+# How am I gonna do thats
+# You have to enter the element in parenthesis and not it's index
+siliconValley.remove('Samsung')
+print(siliconValley)
+
+# I want to sort the list in alphabetical order
+# How to do thats
+# simple
+siliconValley.sort()
+# or
+sorted(siliconValley)
+print(siliconValley)
+
+# I wanted list in reverse alphabetical order
+# simple
+siliconValley.sort(reverse = True)
+# or
+sorted(siliconValley , reverse = True) # seperate the reverse with comma
+print(siliconValley)
+
+# I am tired of watching those elements again and again
+# How I am going to do thats
+# easy
+del siliconValley
+print(siliconValley) # this should probably give you an NameError

mathoperators.py

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+# maths sucks make it cool with python
+# math operators
+
+# INTEGERS
+# integers are whole numbers positive or negative
+# + operator adds numbers
+add = 24 + 1004
+# - operator subtracts second number from First
+subtract = 546 - 132
+# * multiplies numbers
+multiply = 90 * 4
+# / divides numbers
+divide = 36/6
+# returns the remainder of the division
+modulo = 17 % 3
+
+# FLOAT
+# floats are decimal point numbers positive or negative
+addFloat = 24.5 + 1004.005
+subtractFloat = 546.90 - 132.56
+multiplyFloat = 90.0 * 4.2
+divideFloat = 36.6 / 6.6
+moduloFloat = 17.0 % 3.0
+
+# all operators work same on both floats or integers

stringIndexing.py

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+# string indexing
+
+'''
+Indexing
+0  1  2  3  4
+H  E  L  L  O
+'''
+
+message = 'Hello'
+print(message[0]) # this will print H that is first letter in the string
+print(message[1:4]) # this will print from index one to index four
+print(message[:3]) # this will print from starting to index 3
+print(message[2:]) # this will print from index 2 till end
+print(message[:]) # this prints whole string
+print(message[0:4:2]) # this escapes 2 characters from string
+
+# negative Indexing
+'''
+negative Indexing
+  P  y  t  h  o  n
+ -6 -5 -4 -3 -2 -1
+'''
+
+awesome = 'Python is awesome'
+print(awesome[:-1]) # -1 prints last character
+print(awesome[-2]) # this prints m from starting
+print(awesome[-7:]) # try this one out in interpreter
+
+print('You are ' + awesome[10:] + ' you are learning ' + awesome[:6])

stringOperations.py

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+# This example shows you string operations
+
+name = 'Kalpak'
+print('My name is ' + name) # I have given space after is notice
+
+age = 14
+print('My age is ', age) # comma seprates two different things you want to print
+
+print('This isn\'t going away too soon.') # that \ is called as an escape character
+# the \ is used to use same quote in a string
+
+print('I love newlines \n') # \n prints new line after string or according to its position
+
+print('\t I love tabs') # \t adds a tab according to its position
+
+multiple = 'Iron Man'
+print(multiple * 5) # this will print string 5 times
+
+# string methods in built
+country = 'Norway'
+print(country.upper()) # prints all letters in upper case
+print(country.lower()) # prints all letters in lower case
+print(country.title()) # converts into title
+
+# string formatting
+print('%s %s %s'%('I' , 'am' , 'cool'))
+
+expression = 'I love'
+movie = 'Captain America 3'
+print('%s %s'%(expression , movie))
+
+# type conversion
+addition = 12343 + 3349
+print('The answer is ' + str(addition)) # str() method converts non-string into string