bogsio

class Student(models.Model):
	email = models.EmailField()
	...
	
s = Student()
s.email = "valid@email.com"

bogsio

from validate_email import validate_email
    
class EmailField(object):
    def __get__(self, instance, owner):
        return self.value
 
    def __set__(self, instance, value):
        validate_email(value)
        self.value = value
        

bogsio

user1 = User()
user1.email = '123'     # Throws exception
user1.email = 'bogdan@mail.com'
print user1.email       # bogdan@mail.com
 
user2 = User()
user2.email = 'example@mail.com'
print user2.email       # example@mail.com
 
print user1.email       # example@mail.com !!!

bogsio

class EmailField(object):
    __current_id = 0                    # unique id of the instance
    __email_dict = {}                   # dict containing all email values
    __dict_key = "__email_field_key"    # name of member attached to instances
        
    def __get__(self, instance, owner):
        if not hasattr(instance, self.__class__.__dict_key):
            return None
        
        # Retrieve the email value from the dict

bogsio

class User(object):
    email = EmailField()
    ...
    
class Company(object):
    contact = EmailField()
    ...
    
    
user1 = User()

bogsio

assert(majority([]) is None)
assert(majority(None) is None)
assert(majority([1, 2, 3]) is None)
assert(majority([3, 3, 3]) == 3)
assert(majority([1, 2, 3, 3, 3]) == 3)
assert(majority([1, 2, 3, 4, 5]) is None)
assert(majority([1, 3, 2, 3, 3, 6, 5, 8, 3, 3, 3, 6, 3]) == 3)

bogsio

def majority(collection):
    if not collection:
        return None

    # initialize a candidate
    candidate = collection[0]
    chances = 1

    # go through the rest of the elements
    for c in collection[1:]:

bogsio

CREATE TABLE posts (
	post_id SERIAL PRIMARY KEY,
	title text,
	content text
	);

INSERT INTO 
posts(title, content)
VALUES('This is my first post', 
'We are going to have so much fun!')

bogsio

SELECT * 
FROM posts
WHERE content @@ 'watch'

bogsio

SELECT *
FROM posts
WHERE to_tsvector(content) @@ to_tsquery('english', 'watch');