nik-hil

https://unix.stackexchange.com/a/217720

shuf -zn<count> -e *.<file_ext_in_curnt_dir> | xargs -0 cp -vt <target_dir>

shuf -zn8 -e *.jpg | xargs -0 cp -vt target/

shuf shuffles the list of *.jpg files in the current directory.
-z is to zero-terminate each line, so that files with special characters are treated correctly.
-n8 exits shuf after 8 files.
xargs -0 reads the input delimited by a null character (from shuf -z) and runs cp.

nik-hil

# copied from kaggle microsoft malware classification problem discussion forum

import sys
import os
from math import log, pow
import numpy as np
import scipy as sp
from PIL import Image
import matplotlib.pyplot as plt
def saveimg(array,name):

nik-hil

Workflows (States) in Django

I'm going to cover a simple, but effective, utility for managing state and transitions (aka workflow). We often need to store the state (status) of a model and it should only be in one state at a time.

Common Software Uses

• Publishing (Draft->Approved->Published->Expired->Deleted)

nik-hil

from __future__ import with_statement

from fabvenv import virtualenv

from fabric.api import *
from fabric.contrib.console import confirm


# http://stackoverflow.com/questions/1180411/activate-a-virtualenv-via-fabric-as-deploy-user
# http://stackoverflow.com/questions/30964502/python-fabric-nested-roles

nik-hil

#!/usr/bin/env python
"""
Recipe for creating and updating security groups programmatically.


"""

import collections

import boto

nik-hil

class MultipleFieldLookupORMixin(object):
    """
    Actual code http://www.django-rest-framework.org/api-guide/generic-views/#creating-custom-mixins
    Apply this mixin to any view or viewset to get multiple field filtering
    based on a `lookup_fields` attribute, instead of the default single field filtering.
    """
    def get_object(self):
        queryset = self.get_queryset()             # Get the base queryset
        queryset = self.filter_queryset(queryset)  # Apply any filter backends
        filter = {}