#!/usr/bin/python3
 
# output
print ("Hello, Python!")
print(x, end=" ")  # Appends a space instead of a newline in Python 3
 
# input
x = input("something:")
 
# raise exception
raise IOError("file error") #this is the recommended syntax in Python 3

# Quotation in Python
word = 'word'
sentence = "This is a sentence."
paragraph = """This is a paragraph. It is
made up of multiple lines and sentences."""

# Simple Assignment
counter = 100          # An integer assignment
miles   = 1000.0       # A floating point
value   = 3e+26J       # A complex
name    = "John"       # A string
 
# Multiple Assignment
a = b = c = 1
a, b, c = 1, 2, "john"
 
# deletion
a, b, c = 1, 2, "john"

str = 'Hello World!'
 
print (str)          # Prints complete string
print (str[0])       # Prints first character of the string
print (str[2:5])     # Prints characters starting from 3rd to 5th
print (str[2:])      # Prints string starting from 3rd character
print (str * 2)      # Prints string two times
print (str + "TEST") # Prints concatenated string

list = [ 'abcd', 786 , 2.23, 'john', 70.2 ]
tinylist = [123, 'john']
 
print (list)          # Prints complete list
print (list[0])       # Prints first element of the list
print (list[1:3])     # Prints elements starting from 2nd till 3rd 
print (list[2:])      # Prints elements starting from 3rd element
print (tinylist * 2)  # Prints list two times
print (list + tinylist) # Prints concatenated lists

tuple = ( 'abcd', 786 , 2.23, 'john', 70.2  )
tinytuple = (123, 'john')
 
print (tuple)           # Prints complete tuple
print (tuple[0])        # Prints first element of the tuple
print (tuple[1:3])      # Prints elements starting from 2nd till 3rd 
print (tuple[2:])       # Prints elements starting from 3rd element
print (tinytuple * 2)   # Prints tuple two times
print (tuple + tinytuple) # Prints concatenated tuple

#!/usr/bin/python
 
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
 
   def displayEmployee(self):
      print "Name : ", self.name,  ", Salary: ", self.salary
 
"This would create first object of Employee class"
emp1 = Employee("Zara", 2000)
"This would create second object of Employee class"
emp2 = Employee("Manni", 5000)
emp1.displayEmployee()
emp2.displayEmployee()
print "Total Employee %d" % Employee.empCount
 
// Built-In Class Attributes
 
print "Employee.__doc__:", Employee.__doc__
print "Employee.__name__:", Employee.__name__
print "Employee.__module__:", Employee.__module__
print "Employee.__bases__:", Employee.__bases__
print "Employee.__dict__:", Employee.__dict__
 
// Destroying Objects (Garbage Collection)
del emp1
 
// Class Inheritance
#!/usr/bin/python
 
class Parent:        # define parent class
   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): # define child class
   def __init__(self):
      print "Calling child constructor"
 
   def childMethod(self):
      print 'Calling child method'
 
c = Child()          # instance of child
c.childMethod()      # child calls its method
c.parentMethod()     # calls parent's method
c.setAttr(200)       # again call parent's method
c.getAttr()          # again call parent's method
 
 
// Overriding Methods
#!/usr/bin/python
 
class Parent:        # define parent class
   def myMethod(self):
      print 'Calling parent method'
 
class Child(Parent): # define child class
   def myMethod(self):
      print 'Calling child method'
 
c = Child()          # instance of child
c.myMethod()         # child calls overridden method