72 posts tagged with "python"

The execution speed comparison between Pendulum and the default Python datetime module is generally straightforward: The built-in datetime module is significantly faster than Pendulum for basic operations.

This difference is due to how the two libraries are implemented and what they prioritize.

Pendulum is a Python library designed to simplify working with dates and times, often serving as a more developer-friendly and robust replacement for Python's built-in datetime module. You should use Pendulum whenever your application involves timezone handling, complex arithmetic, or serialization/parsing of date strings, as it provides clear, unambiguous, and efficient methods for these tasks.

Pip is the standard package installer for Python. It allows you to manage the libraries and dependencies needed for your projects. Mastering a few core commands can significantly streamline your Python development workflow.

Managing the active Python version is critical for development, especially when working on projects with different dependencies or legacy requirements. The methods vary significantly depending on whether you are using a dedicated version manager, a package manager, or system-level tools.

A Python datetime object is considered timezone-aware if its tzinfo attribute is set, and timezone-naive if tzinfo is None. Removing timezone information, or "making it naive," is the process of setting this attribute to None.

The key consideration when stripping the timezone is which time value you want to keep: the time as it was originally represented, or the time converted to a standard reference (like UTC or local time) before stripping the timezone.

If your poetry install command is failing specifically when trying to install multidict (or packages that depend on it, like aiohttp or discord.py), the root cause is almost always a failure to compile the optional C extensions for the package.

Since multidict offers pre-compiled binaries (wheels) for standard Python versions on common operating systems, a compilation error indicates one of two things: the wheel is unavailable for your specific setup, or the local build tools are missing. Your use of pyenv often exacerbates the issue by complicating the environment setup.

The fundamental way to integrate Firestore as the policy storage for Casbin is by using a dedicated Adapter. In Casbin, an adapter serves as the persistent layer, handling the LoadPolicy() and SavePolicy() operations between the in-memory enforcer and the database.

Generating a QR code for a PDF file is not a matter of embedding the entire file's data into the QR code. QR codes have a strict data limit (typically up to about 4,000 characters), which is far too small for most PDF documents 1.

The correct, industry-standard approach is to host the PDF online and encode the resulting direct URL into the QR code. When a user scans the code, their device opens the URL, which automatically downloads or displays the PDF.

Here is the guide for generating the QR code using a URL link.

Python QR code reader from image or How to decode a QR-code image in python?​

Decoding a QR code from an image in Python is primarily achieved using the pyzbar library, which reads various bar codes and QR codes 1, 2.

How to create QR code generator with logo with Python​

Creating a QR code generator with logo in Python is best done using the qrcode library, specifically its advanced image capabilities, combined with Pillow (PIL) for image handling. This guide provides two methods: a simple, modern approach and a manual, detailed approach.