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why-not / stop_idle_aws.py
Last active February 21, 2025 03:33
Automatically stopping an AWS machine when users are not actively using a machine via ssh, and the CPU load avg over the past 5 mins is less than THRESHOLD. This will avoid getting billed for the machine when not in use (except ofcourse your storage will still be billed unless you delete everything and decommission those as well, which this scri…
#!/usr/bin/env python
# shell commands being automated.
# w
# aws ec2 stop-instances --instance-id INSTANCE_ID
"""
The script is the easy part, installing it into the unfriendly(imo) cron system and
making all the permissions and paths are set correctly is another issue altogether.
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why-not / stop-idle-azure-aws.py
Last active March 4, 2024 19:49
Automatically Shutting Down and Deallocating an AZURE or AWS VM (when idle AND no one is logged in via SSH)
#!/usr/bin/env python
# shell commands being automated.
# w
# aws ec2 stop-instances --instance-id INSTANCE_ID
# az vm deallocate --name NAME --resource-group RESOURCE_GROUP
"""
The script is the easy part, installing it into the unfriendly(imo) cron system and
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why-not / vector_intersection.md
Created December 11, 2016 05:04 — forked from hellpanderrr/vector_intersection.md
Python find intersection of two vectors using matplotlib and numpy 
from numpy import dot,array,empty_like
from matplotlib.path import Path

def make_path(x1,y1,x2,y2):
    return Path([[x1,y1],[x1,y2],[x2,y2],[x2,y1]])

def perp( a ) :
    b = empty_like(a)
 b[0] = -a[1]
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why-not / README.md
Last active August 29, 2015 13:57 — forked from milroc/README.md

d3.unconf example gist. Fork it here.

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why-not / gist:5379296
Last active December 16, 2015 04:48
Given a folder full of jpegs, this gist prints out if you have a face in it which is frontal (not profile), and its ratio between face size and image size. If it finds more than one face, it treats it as if no faces were found. (Use case: profile pictures)
import sys, os
from cv import *
from cv2 import *
import glob
def detect_face(image):
"""Converts an image to grayscale and prints the ratio of face to image if _one_ face is found"""
grayscale = CreateImage((image.width, image.height), 8, 1)
CvtColor(image, grayscale, CV_BGR2GRAY)
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why-not / gist:4582705
Last active October 2, 2025 03:23
Pandas recipe. I find pandas indexing counter intuitive, perhaps my intuitions were shaped by many years in the imperative world. I am collecting some recipes to do things quickly in pandas & to jog my memory.
"""making a dataframe"""
df = pd.DataFrame([[1, 2], [3, 4]], columns=list('AB'))
"""quick way to create an interesting data frame to try things out"""
df = pd.DataFrame(np.random.randn(5, 4), columns=['a', 'b', 'c', 'd'])
"""convert a dictionary into a DataFrame"""
"""make the keys into columns"""
df = pd.DataFrame(dic, index=[0])