gergob

from pymongo import MongoClient
from bson.objectid import ObjectId
from project import Project

class ProjectsRepository(object):
    """ Repository implementing CRUD operations on projects collection in MongoDB """

    def __init__(self):
        # initializing the MongoClient, this helps to 
        # access the MongoDB databases and collections 

gergob

from bson.objectid import ObjectId

class Project(object):
    """A class for storing Project related information"""

    def __init__(self, project_id=None, title=None, description=None, price=0.0, assigned_to=None):        
        if project_id is None:
            self._id = ObjectId()
        else:
            self._id = project_id

gergob

#creating a new dictionary with 3 keys : name, age and balance
d = { "name": "John Doe", "age": 44, "balance": 235.5 }

#printing out the values of the dictionary using the kyes
print(d["name"])    # will display "John Doe"
print(d["age"])     # will display 44
print(d["balance"]) # will display 235.5

#using dict to create dictionaries
my_dict_1 = dict(name="John Doe", age=44, balance=235.5)

gergob

my_list_1 = [1, 3, 5, 7, 11, 13, 17]
my_list_2 = range(10, 21) # will result [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]


my_list_3 = range(10)
for nr in my_list_3:
  print(nr)
  # and maybe do some other stuff
  
#indexing - used for getting and setting values

gergob

>>> from mro_type_error import Phablet
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "mro_type_error.py", line 30, in <module>
    class Phablet(SmartPhone, Tablet):
TypeError: Cannot create a consistent method resolution
order (MRO) for bases Phone, Computer
>>>

gergob

class Phone(object):
    def __init__(self):
        print("Phone constructor invoked.")
    
    def call_number(self, phone_number):
        print("Calling number {}".format(phone_number))


class Computer(object):
    def __init__(self):

gergob

>>> SmartPhone.mro()
[<class 'SmartPhone'>, <class 'Phone'>, <class 'Computer'>, <class 'object'>]
>>> SmartPhone.__mro__
(<class 'SmartPhone'>, <class 'Phone'>, <class 'Computer'>, <class 'object'>)

gergob

Python 3.2.3 (default, Feb 27 2014, 21:31:18) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from oop_multi import SmartPhone
>>> s = SmartPhone()
Phone constructor invoked.
Computer constructor invoked.
>>> 

gergob

class Phone(object):
    
    def __init__(self):
        print("Phone constructor invoked.")
    
    def call_number(self, phone_number):
        print("Calling number {}".format(phone_number))

gergob

#
# will be discussed later why only the constructor of Phone class was invoked
#
>>> my_iphone = SmartPhone()
Phone constructor invoked. 

>>> my_iphone.call_number("123456789")
Calling number 123456789

>>> my_iphone.install_software("python")