Overload del operator
__del__ is a destructor
class Life:# w w w.j av a2 s . c o m
def __init__(self, name='unknown'):
print 'Hello', name
self.name = name
def __del__(self):
print 'Goodbye', self.name
brian = Life('A')
brian = 'B'
del brian
The code above generates the following result.
Class Employee with class attribute count.
class Employee:# from ww w.ja va 2 s . c o m
count = 0
def __init__( self, first, last ):
self.firstName = first
self.lastName = last
Employee.count += 1
print "Employee constructor for %s, %s" % ( self.lastName, self.firstName )
def __del__( self ):
Employee.count -= 1
print "Employee destructor for %s, %s" % ( self.lastName, self.firstName )
print "Number of employees before instantiation is", Employee.count
# create two Employee objects
employee1 = Employee( "A", "C" )
employee2 = Employee( "B", "D" )
employee3 = employee1
print "Number of employees after instantiation is", employee1.count
# explicitly delete employee objects by removing references
del employee1
del employee2
del employee3
print "Number of employees after deletion is", Employee.count
The code above generates the following result.
