| Screen { | |
| overflow: auto; | |
| } | |
| #calculator { | |
| layout: table; | |
| table-size: 4; | |
| table-gutter: 1 2; | |
| table-columns: 1fr; | |
| table-rows: 2fr 1fr 1fr 1fr 1fr 1fr; |
| """Setting up the local environment.""" | |
| import itertools | |
| import numpy as np | |
| import matplotlib as mpl | |
| import matplotlib.pyplot as plt | |
| from functools import reduce |
| /***************************************************************************** | |
| * QuantCup 1: Price-Time Matching Engine | |
| * | |
| * Submitted by: voyager | |
| * | |
| * Design Overview: | |
| * In this implementation, the limit order book is represented using | |
| * a flat linear array (pricePoints), indexed by the numeric price value. | |
| * Each entry in this array corresponds to a specific price point and holds | |
| * an instance of struct pricePoint. This data structure maintains a list |
| """ | |
| A slightly more convenient alternative to the builtin `sorted()` which allows | |
| you to specify a key as something other than a function. | |
| For example, with a list of lists, if you wanted to sort by the last element you | |
| could use `sort(lstseq, key=-1)` rather than `sorted(lstseq, key=lambda x: x[-1])`. | |
| If your key *is* a function, it behaves identically to `sorted()`, because it is | |
| really just wrapping the builtin. | |
| Examples | |
| -------- |
| import cv2 | |
| import subprocess | |
| ### for reference, the output of v4l2-ctl -d /dev/video1 -l (helpful for min/max/defaults) | |
| # brightness (int) : min=0 max=255 step=1 default=128 value=128 | |
| # contrast (int) : min=0 max=255 step=1 default=128 value=128 | |
| # saturation (int) : min=0 max=255 step=1 default=128 value=128 | |
| # white_balance_temperature_auto (bool) : default=1 value=1 | |
| # gain (int) : min=0 max=255 step=1 default=0 value=0 | |
| # power_line_frequency (menu) : min=0 max=2 default=2 value=2 |
Sometimes a python script will simply hang forever with no indication of where things went wrong. Perhaps it's polling a service that will never return a value that allows the program to move forward. Here's a way to see where the program is currently stuck.
Install gdb.
# Redhat, CentOS, etc
Long ago, the first time I read "The Pragmatic Programmer", I read some advice that really stuck with me.
"Don't Use Manual Procedures".
This in the chapter on Ubiquitous Automation. To summarize, they want you to automate all the things.
The trouble was that I hadn't much of an idea how to actually go
Just a quickie test in Python 3 (using Requests) to see if Google Cloud Vision can be used to effectively OCR a scanned data table and preserve its structure, in the way that products such as ABBYY FineReader can OCR an image and provide Excel-ready output.
The short answer: No. While Cloud Vision provides bounding polygon coordinates in its output, it doesn't provide it at the word or region level, which would be needed to then calculate the data delimiters.
On the other hand, the OCR quality is pretty good, if you just need to identify text anywhere in an image, without regards to its physical coordinates. I've included two examples:
####### 1. A low-resolution photo of road signs
As websites become more JavaScript heavy, it's harder to automate things like screenshotting for archival purposes. I've seen examples and suggestions to use PhantomJS for visual testing/archiving of websites, but have run into issues such as the non-rendering of webfonts. I've never tried out Selenium until today...and while I'm not thinking about performance implications yet, Selenium seems far more accurate than PhantomJS...which makes sense since it actually opens a real browser. And it's not too hard to script to do complex interactions: here's an [example of how to log in to Twitter, write a tweet, upload an image, and send a tweet via Selenium and DOM element selection](https://gist.github.com/dannguyen/8a6fa49253c1d6a0eb92