quietcricket

sudo yum update


# call amazon-linux-extras to view what packages are available
sudo amazon-linux-extras install nginx1

sudo systemctl enable nginx.service
sudo systemctl start nginx.service 

# gcc and python-devel required for uwsgi

quietcricket

from __future__ import print_function, division

def check_sudoku(arr):
    # 9 rows, 9 columns and 9 sub squares
    # Each of them need to have all the digits
    # Not using bit shifting 
    alignments = [987654321] * 27
    
    for i, row in enumerate(arr):
        for j, x in enumerate(row):

quietcricket

mkdir MyIcon.iconset
sips -z 16 16     Icon1024.png --out MyIcon.iconset/icon_16x16.png
sips -z 32 32     Icon1024.png --out MyIcon.iconset/icon_16x16@2x.png
sips -z 32 32     Icon1024.png --out MyIcon.iconset/icon_32x32.png
sips -z 64 64     Icon1024.png --out MyIcon.iconset/icon_32x32@2x.png
sips -z 128 128   Icon1024.png --out MyIcon.iconset/icon_128x128.png
sips -z 256 256   Icon1024.png --out MyIcon.iconset/icon_128x128@2x.png
sips -z 256 256   Icon1024.png --out MyIcon.iconset/icon_256x256.png
sips -z 512 512   Icon1024.png --out MyIcon.iconset/icon_256x256@2x.png
sips -z 512 512   Icon1024.png --out MyIcon.iconset/icon_512x512.png

quietcricket

Playing around with ESP8266 and MicroPython

ESP8266

The ESP8266 is a low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller capabilities.  

1. CPU: 80 MHz
2. Memory: 32 KiB instruction, 80 KiB user data
3. Input: 16 GPIO pins
4. Power: 3.3V DC

quietcricket

import sys

from reportlab.lib.pagesizes import *
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.lib.units import inch
from reportlab.platypus import Paragraph, SimpleDocTemplate, Spacer, PageBreak
from reportlab.lib.enums import *
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont

quietcricket

esptool.py --port /dev/tty.wchusbserial1410 --baud 115200 write_flash -fm dio --flash_size=detect 0 esp8266-20171101-v1.9.3.bin
screen /dev/tty.wchusbserial1410 -b115200

quietcricket

• Sacrifice storage for computing time/power: store calculated values and avoid batch job
• Sacrifice best OOP/DRY practice to simplify complexity: avoid having too many levels of inheritance and compositions. The human brain cannot handle too much info.
• Avoid having too many helper/factory files: when modifying one function, we shoudn't need to jump back and forth from many other files.

quietcricket

"""
If you try to generate documentations using sphinx's autodoc with models extending mongoengine's Document You are going to have a bad time
  1.  The code will call Document.objects and list all the entries in your doc!!!
  2.  Your model's fields will inherit the default docstr from Field class if you don't have any comment. The documentation generated is very long and difficult to read
This snippet helps to solve these 2 problems. Insert them into config.py file.
"""

import re
from mongoengine.base.fields import ObjectIdField

quietcricket

import mimetypes

def upload_s3(key, fileobj, bucket_name, cache=999999):
    """
    Lots of problems with new boto3 library. Many functions are not documented or wrongly documented
    1. s3.Object.metadata, s3.Object.cache_control, s3.Object.content_type: are read only, gotcha
    2. If you set it with `ExtraArgs={'Metadata':{...}}`, wrong again. Cache-Control will become amz-x-cache-control,
    not what you wanted
    3. If you set it with `ExtraArgs={'Cache-Control':'max-age=999'}`, wrong again! They need too be CacheControl and ContentType
    """

quietcricket

def download_file(url):
    r = requests.get(url)

    if r.status_code != 200 or len(r.content) < 100:
        raise 'Download Failed'

    if re.search('\.png', url):
        file_type = 'png'
    elif re.search('\.gif', url):