Python snippets (2)

def simpleGen():

    yield 1

    yield '2--->punch!'

myG = simpleGen()

'''

myG.next()

myG.next()

myG.next() #Exception

'''

for eachItem in simpleGen():

    print eachItem,

print '-----------------------------------------'

from random import randrange

def randGen(aList):

    while len(aList) > 0:

        yield aList.pop(randrange(len(aList)))# Just like list.pop() and random.choice()

for item in randGen(['rock', 'paper', 'scissors']):

    print item

import longmodulename

short = longmodulename

del longmodulename

from cgi import FieldStorage as form

globals().keys()

locals().keys()

#!/usr/bin/env python

class AddressBookEntry(object):

    'address book entry class'

    def __init__(self, nm, ph):

        self.name = nm

        self.phone = ph

        print 'Created instance for:', self.name

    def updatePhone(self, newph):

        self.phone = newph

        print 'Updated phone# for:', self.name

    def __del__(self):

        #self.__class__.oobject.__del__(self)

        print '__del__ from AddressBookEntry triggered'

class EmplAddressBookEntry(AddressBookEntry):

    addressBookEntry = AddressBookEntry  #take attention this

    def __init__(self, nm, ph, id, em):

        AddressBookEntry.__init__(self, nm, ph) #Call the parent init function

        self.empid = id

        self.email = em

    def updateEmail(self, newem):

        self.email = newem

        print 'Updated e-mail address for:',self.name

    def __del__(self):

        self.__class__.addressBookEntry.__del__(self) #take attention this,

        print '__del__ from EmplAddressBookEntry trigged'

if __name__ == '__main__':

    john = EmplAddressBookEntry('Leslie', '123455', 27, 'john@spam.doe')

    print john

    print john.name

    print john.email

#!/usr/bin/env python

"Note some important points here"

class TestStaticMethod:

    @staticmethod

    def foo():

        print 'Calling static method foo()'

class TestClassMethod:

    @classmethod

    def foo(cls):

        print 'calling class method foo()'

        print 'foo() is part of class',cls.__name__

tsm = TestStaticMethod()

TestStaticMethod.foo()

tsm.foo()

tcm = TestClassMethod()

TestClassMethod.foo()

tcm.foo()

# super here

class P(object):

    def foo(self):

        print "Hi, I am P-foo()"

class C(P):

    def foo(self):

        super(C, self).foo() #Call the base class foo()

        print 'Hi, I am C-foo()'

c = C()

c.foo()

print '-------------------------SortedKeyDict(dict)----------------------------'

class SortedKeyDict(dict):

    def keys(self):

        return sorted(super(SortedKeyDict, self).keys())

d = SortedKeyDict((('zheng-cai', 7), ('leslie', 27)))

print 'By iterator:'.ljust(15,' '),[key for key in d]

print '----------------MRO-----------------------'

class B:

    pass

class C:

    def __init__(self):

        print 'the default constructor'

class D(B, C):

    pass

d = D() #the default constructor

----------------------------------------

class B(object):

    pass

class C(object):

    def __init__(self):

        print 'the default constructor from new'

class D(B, C):

    pass

d = D() #the default constructor from new