1 2 3 4 5 import datetime from dateutil.relativedelta import relativedelta your_datetime = datetime.datetime.now() your_datetime + relativedelta(months=1) # adds one month That function clips the overflowing day of the months: 1 2 3 4 5 6 7 8 9 10 >>> datetime(2021, 1, 28) + relativedelta(months=1) datetime.datetime(2021, 2, 28, 0, 0) >>> datetime(2021, 1, 29) + relativedelta(months=1) datetime.datetime(2021, 2, 28, 0, 0) >>> datetime(2021, 1, 30) + relativedelta(months=1) datetime.datetime(2021, 2, 28, 0, 0) >>> datetime(2021, 1, 31) + relativedelta(months=1) datetime....

Import module by path/name 1 2 import importlib module = importlib.import_module(module_path) Find class implementing certain interface in a module 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 def load_class_from_module(module_path: str, target_class: type) -> type: module = importlib.import_module(module_path) list_classes = get_all_classes_implementing_interface(module, target_class) if not list_classes: raise RuntimeError("Unable to find implemented interface {} in {}".format(target_class, module_path)) if len(list_classes) > 1: raise RuntimeError("More then 1 implementation of {} was found in {}"....

How to include default values in ‘–help’ 1 2 3 parser = argparse.ArgumentParser( # ... other options ... formatter_class=argparse.ArgumentDefaultsHelpFormatter) Output looks like this: 1 2 3 --scan-time [SCAN_TIME] Wait SCAN-TIME seconds between status checks. (default: 5) Another tip: add ‘%(default)’ to the help parameter to control what is displayed. 1 2 parser.add_argument("--type", default="toto", choices=["toto","titi"], help = "type (default: %(default)s)") source

Some linux commands that I’ll probably need in the future User management Add user to a group sudo usermod -aG group user or sudo adduser <user> <group> Delete user userdel user Delete the user’s home directory and mail spool: userdel -r user Remove user from a group sudo gpasswd -d user group list all users: $ getent passwd list all groups: $ getent group list all groups of the current user:...

Expandable / collapsible code blocks in github The text is shown on click. 1 2 3 4 <details> <summary>Click to expand</summary> your hidden code </details> Results: Click to expand your hidden code Source

Task was to transmit image from camera on raspberry pi through web interface to the PC. PC is connected to raspberry through local network. Enable camera on your raspberry pi in raspi-conf. Reboot. Save the following source code to a file on your raspberry (let’s say streaming.py) do sudo pip3 install picamera run python3 streaming.py on the target machine (PC) go to http://<your raspberry ip or host name>:8000. output from the camera must be streaming in realtime....

TensorFlow Serving, sources - library for serving machine learning models. Written in C++ and Python. Server is in C++. Requires Bazel - Google’s build tool. Doesn’t work with python 3. Probably fast. TensorFlow: How to freeze a model and serve it with a python API Building a Machine Learning App with AWS Lambda (slides) Pipeline.io - End-to-End, Continuous Spark ML + Tensorflow AI Data Pipelines, Sources Interesting thread. They propose to use “saved_model_cli binary (in tools/), which you can feed a SavedModel, and pass input data via files....

Here I will collect links to well-written articles about math and algorithms. Visual Information Theory. Nice post about probabilities, entropy. The whole blog has awesome visualizations. Highly recommended. MNIST For ML Beginners - Nice introduction into machine learning with TensorFlow Brilliantly wrong - blog by Alex Rogozhnikov, with fantastic visualizations of many algorithms and concepts Collection of data science notebooks. Deconvolution and Checkerboard Artifacts by Odena, et al., 2016 - explanation of deconvolution operation in neural networks with awesome interactive visualizations...

Headless Chromium Splash - A javascript rendering service. guthub https://scrapy.org/ - An open source and collaborative framework for extracting the data you need from websites. Web crawler с использованием Python и Chrome

Using convert utility we can join multiple image files (png, jpeg, pdf) into one pdf. convert -density 250 file1.pdf file2.JPG file3.pdf -compress JPEG -quality 70 combined.pdf we use JPEG compression with quality =90 for images inside PDF. Otherwise the PDF will be too large. source For me images appear rotated inside the pdf. That’s probably because EXIF information about image rotation is not taken into account by pdf converter. You can remove all the meta information first with convert <input file> -strip <output file> and then combine it to a pdf....