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#!/usr/bin/python

import os

#If there is only one statement that would have gone in the block then it can

#be specified in the same line

if os.name == 'posix': print 'You are cool'

def say_hello(): return 'hello'

print say_hello()

#List comprehensions

class Employee:

def __str__(self):

return self.name + ' ' + str(self.salary)

def __init__(self, name, salary):

self.name = name

self.salary = salary

employees = []

employees.append(Employee('Tom', 30000))

employees.append(Employee('Satish', 40000))

employees.append(Employee('Harry', 50000))

#Let's get a list of all employees whose salaries are greater than 30000

#using list comprehensions

sal_more_than_40k = [e for e in employees if e.salary > 40000]

print 'Listing ' + str(len(sal_more_than_40k)) + ' employees with sal > 40k'

for emp in sal_more_than_40k:

print emp

#Now let's get something similar using lambda expressions

sal_more_than_30k = filter(lambda e : e.salary > 30000, employees)

print "Listing " + str(len(sal_more_than_30k)) + " employees with sal > 30k"

for emp in sal_more_than_30k:

print emp

#`` and repr return a canonical form of an object in the form if a string

#We can control what repr returns with the __repr__() method

print repr(sal_more_than_30k)

print `sal_more_than_30k`

eval(repr(sal_more_than_30k))