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DATABASES = {
    'default': {
        'ENGINE':'django.db.backends.mysql',
        ...
        'OPTIONS': {'charset': 'utf8mb4'},
    }
}

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class CreditCardForm(ModelForm):
    card_number = CreditCardField(placeholder=u'0000 0000 0000 0000', min_length=12, max_length=19)

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from django import forms
from django.forms.widgets import TextInput
from django.utils.translation import ugettext_lazy as _


class TelephoneInput(TextInput):

    # switch input type to type tel so that the numeric keyboard shows on mobile devices
    input_type = 'tel'

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find . \( -name '*.py' -o -name '*.coffee' -o -name '*.scss' \) | xargs wc -l

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from django.views.generic import UpdateView

from forms import MyModelForm
from models import MyModel


class MyUpdateView(UpdateView):

    # specify a custom ModelForm
    form_class = MyModelForm

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ids = [9, 8, 1, 2, 7, 3]
results = Model.objects.filter(id__in=ids).extra(
    select={'manual': 'FIELD(id,%s)' % ','.join(map(str, ids))},
    order_by=['manual']
)

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SELECT id, name
FROM table
WHERE name IN (9, 8, 1, 2, 7, 3)
ORDER BY FIELD(id, 9, 8, 1, 2, 7, 3)

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from itertools import chain
from operator import attrgetter


# ascending oreder
result_list = sorted(
    chain(queryset1, queryset2),
    key=attrgetter('date_created'))
    
# descending order

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from itertools import chain


result_list = list(chain(queryset1, queryset2))

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import httplib2

from googleapiclient.discovery import build
from googleapiclient.http import HttpError
from oauth2client.client import SignedJwtAssertionCredentials

def get_metrics():

    # load the service account key
    # this key is managed here - https://console.developers.google.com/project