notes_python

#print in python

print "hello"

#arithmetic operations
10/3 = 3
10/3.0 = 2.3333333

#variable assignment
a = "hello"

#concatination can be done by "+" or "," as well
a = "hello"
b = "world"
print a,b
print a+b

#multiplication of string
a = "hi"
print a*3 #output: hi hi hi 


#take input from user
a = raw_input()
a = raw_input("Enter any number: ")

#evaluate the value of input if it's integer then variable type is integer, if it's string variable type is string
a = eval(raw_input())

#lists in python
fruits = ["apple", "orange", "mango"]
fruits[0:2] # ['apple', 'orange']

a = [1,2,3]
b = [4,5,6]
c = a+b 	#output: [1,2,3,4,5,6]

#sort list
list.sort()



#defind tuple which is same as list but won't allow you to modify
tup = (1,2,3,4)
del tup

#data-dictionary
dict = {1: 'alpha', 2: 'beta', 3:'theta'}



#Introduction to computation and programming with python : john
#pydev-baroda



#functions:
#declared using keyword def



The constructor is always written as a function called __init__(). it must always take as its first argument a referenced to the instance being constructed. This is typically called self. The rest of the arguments are up to the programmer.

the object on the first line is the superclass, i.e. this says that MyClss is a subclass of object