Learn Python Coding
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Learn Python through simple, practical examples and real coding ideas. Clear explanations, useful snippets, and hands-on learning for anyone starting or improving their programming skills.

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โœ๏ธ Pyneng โ€” a large base for Python and network automation!

Detailed documentation and educational materials. The site contains lessons on Python syntax, working with files, functions, OOP, as well as separate sections on network technologies. The materials are presented with a large number of examples and practical tasks.

๐Ÿ“Œ I'll leave a link: https://pyneng.readthedocs.io/en/latest/

#Python #NetworkAutomation #Pyneng #LearnPython #DevOps #TechEducation

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โค4
When you're doing a parser or migrating a site, there's often a pile of unreadable HTML markup on the screen. Converting this into neat Markdown is usually a hassle.

In the open code, I found a convenient tool called python-markdownify, which precisely solves the problem of converting HTML to Markdown.

The logic is simple: you take bulky HTML and get a clear and well-structured Markdown as a result.

The tool is easily customizable. You can clean up the necessary tags, change the format of headings, and neatly process tables and images. All of this can be configured.

It's installed via pip. It can be used both from Python code and from the command line, converting files in batches.

pip install python-markdownify

If desired, you can inherit and redefine the conversion rules for your own cases. The extensibility is fine there.

If you have to process large amounts of text or migrate a blog, the library saves a lot of time that would otherwise be spent on tedious work with regular expressions.

โžก๏ธ Link to GitHub
https://github.com/matthewwithanm/python-markdownify

#python #markdown #html #coding #devtools #opensource

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โค4
Advice for Python, UV, and Docker ๐Ÿ๐Ÿณ

Sometimes dependencies are better installed separately from the code โ€” this noticeably speeds up the compilation of Docker images ๐Ÿš€

The idea is simple: first, we install dependencies, then we add the project ๐Ÿ› 

Why is this necessary:
โ€ข Docker caches layers and does not rebuild them unnecessarily โšก๏ธ
โ€ข if only the code changes โ€” the dependencies are taken from the cache ๐Ÿ’พ
โ€ข if the dependencies change โ€” only the corresponding layer is rebuilt ๐Ÿ”
โ€ข without this, any minor change triggers a full reinstallation ๐Ÿ”„

Example:

RUN --mount=type=cache,target=/root/.cache/uv  --mount=type=bind,source=uv.lock,target=uv.lock  --mount=type=bind,source=pyproject.toml,target=pyproject.toml  uv sync --locked --no-install-project

COPY . /app
RUN --mount=type=cache,target=/root/.cache/uv uv sync --locked


#Python #Docker #DevOps #UV #SoftwareEngineering #TechTips

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โค4
Limiting program resources using the resource module ๐Ÿ›ก๏ธ

import resource
import sys

# 1. Limiting the size of RAM (soft and hard limits in bytes)
# Limit the memory to ~50 MB
memory_limit = 50 * 1024 * 1024
resource.setrlimit(resource.RLIMIT_AS, (memory_limit, memory_limit))

# 2. Checking the protection's working
try:
print("Trying to allocate a huge array of memory...")
huge_list = [i for i in range(10_000_000)]
except MemoryError:
print("The limit worked! The program didn't crash, but caught the error.")

# 3. Finding out how many resources the script has already consumed
usage = resource.getrusage(resource.RUSAGE_SELF)
print(f"Peak memory consumption (in KB): {usage.ru_maxrss}")

Protecting the server from "greedy" code ๐Ÿ”ง

When you run someone else's code, process user files, or write parsers, there's always a risk of a memory leak or an infinite loop. If such a script runs on the server, it can fill up all the RAM and bring down neighboring important processes (for example, the database). The built-in resource module (works on Unix/Linux/macOS) allows you to strictly limit the program's appetites.

โ€” Safe environment: You can limit not only RAM (RLIMIT_AS), but also CPU time (RLIMIT_CPU). If the code goes into an infinite loop, the system will gracefully terminate it after a specified number of seconds.

โ€” File system control: Using RLIMIT_FSIZE, you can prevent the script from creating files larger than a certain size. This will save the server's disks from being accidentally overwritten by gigantic logs.

โ€” Precise audit: The getrusage function provides detailed statistics on the current process: how much time the CPU spent on calculations, how many I/O operations there were, and what the maximum amount of memory used was during the entire operation.

#Python #ResourceManagement #ServerSafety #Coding #DevOps #Linux

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โค4
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โค2
A 14-day tutorial where you build a Python code-agent CLI in the style of Claude Code from scratch and simultaneously understand how the Agent Harness actually works. ๐Ÿ› ๏ธ๐Ÿค–

In the end, you don't just call a ready-made agent via the API, but you understand the components that make up a Claude Code-like tool. ๐Ÿง โš™๏ธ

https://github.com/bozhouDev/14days-build-claude-code-cli/blob/main/README.en.md

#Python #AI #ClaudeCode #CLI #CodingTutorial #Tech

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โค2๐Ÿ”ฅ1
Python can substitute an empty context manager without conditions inside!

It often happens that a resource needs to be opened via with, and sometimes the object is already ready and there's no need to open anything.

This usually leads to code duplication or conditions around with:

if need_open:
f = open(...)
else:
f = existing_file

`nullcontext(obj) behaves like an empty context manager and allows you to maintain a single execution flow.

This is especially useful for APIs, tests, optional resources, dependency injection, and functions that can accept both a path and a ready-made object.

with ctx as resource:
process(resource)

But note that nullcontext() does not close the passed object โ€” it simply passes it on further.

๐Ÿ”ฅ nullcontext() helps to unify scenarios with optional context managers and significantly simplifies the architecture of IO code.

#Python #ContextManager #CodingTips #DevLife #Programming #Tech

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โค1
Do you know that Python can shift sequences without slicing and creating new lists?

When you need to cyclically shift data, many use slicing:

data = data[-1:] + data[:-1]

But deque.rotate() does this at the level of the data structure and usually works more efficiently for cyclical operations.

q.rotate(1)

A negative value rotates the queue in the other direction.

q.rotate(-2)

This is useful for ring buffers, task schedulers, cyclical queues, and round-robin algorithms.

workers.rotate(-1)

๐Ÿ”ฅ deque.rotate() allows you to implement cyclical data structures without manual index logic and without creating new lists.

#Python #DataStructures #CodingTips #Programming #Deque #Tech

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โค2
Shuffling without repetitions:

import random

# Initial list of candidates or prizes
participants = ["Alexey", "Maria", "Ivan", "Olga", "Dmitry"]

# 1. Selecting 3 unique winners (sample without replacement)
winners = random.sample(participants, k=3)
print(f"Winners: {winners}")
# The result is different each time, but there will be no repetitions within the list of winners!

# 2. Shuffling an entire string (creating an anagram)
word = "python"
shuffled_word = "".join(random.sample(word, len(word)))
print(f"Anagram: {shuffled_word}")

# 3. Important difference: random.choices allows repetitions
print(f"With repetitions: {random.choices(participants, k=3)}")

โœจ Honest selection and generation of unique sets

When it's necessary to implement the logic of prize draws, random task distribution, or generating test questions, developers often use random.choice() in a loop. But this approach requires manually ensuring that the same element is not selected twice. The random.sample function takes on this routine.

โ€” Guarantee of uniqueness: The main property of random.sample is "without replacement". The extracted element no longer participates in the next selection cycle, which completely eliminates duplicates in the resulting list.

โ€” Safety of the original: The function does not modify the original list (unlike random.shuffle()), but creates a completely new array with the results. This allows the structure of the original data to remain intact.

โ€” Strict control of size: If you pass a parameter k (the number of elements) that exceeds the length of the original list, Python will not start duplicating elements and will immediately throw an ValueError error. This protects the program logic from incorrect data.

#Python #Random #Coding #NoRepetition #DataScience #UniqueSets

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โค3
Convert PDF to structured JSON โ€” in a couple of lines and without hassle! ๐Ÿ“„โœจ

Today, we'll create a mini-service that takes a PDF document, extracts the text from it, and asks GPT to neatly organize the content into sections: title, author, date, and a list of sections. ๐Ÿš€

First, let's connect the necessary libraries and API key:

import os
from PyPDF2 import PdfReader
from openai import OpenAI

client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

Now, let's extract the text from the PDF. We'll loop through all the pages and combine them into a single string:

reader = PdfReader("document.pdf")
text = "
".join(page.extract_text() for page in reader.pages)

Next, we'll send the obtained text to GPT. We'll ask the model to return a structured JSON with the necessary fields:

response = client.chat.completions.create(
model="gpt-4o",
messages=[
{"role": "system", "content": (
"You are a PDF parser. Return a JSON with the fields: title, author, date, sections. "
"Each section is an object with name and summary."
)},
{"role": "user", "content": text}
]
)

Output the result:

structured = response.choices[0].message.content.strip()
print(structured)

๐Ÿ”ฅ Suitable for contracts, reports, methodologies, and any PDFs โ€” we immediately get a JSON ready for use.

#PDF #JSON #Python #GPT #Automation #DataScience

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โค1
How to create your own context manager in Python for opening and closing a connection to the SQLite database

The enter() method is used when opening a connection, and the exit() method is used when closing it:

import sqlite3

class DatabaseConnection:
def __init__(self, db_name):
self.db_name = db_name
self.connection = None

def __enter__(self):
self.connection = sqlite3.connect(self.db_name)
return self.connection

def __exit__(self, exc_type, exc_val, exc_tb):
if self.connection:
self.connection.close()

# Usage
with DatabaseConnection("example.db") as conn:
cursor = conn.cursor()
cursor.execute("SELECT * FROM users")

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#Python #SQLite #ContextManager #Programming #Coding #Tech
โค3
Safe rounding of numbers with math.fsum

import math

# Initial list with fractions
values = [0.1] * 10

# 1. Regular summation via sum()
print(f"Standard sum(): {sum(values)}") # 0.9999999999999999

# 2. Exact summation via math.fsum()
print(f"Exact math.fsum(): {math.fsum(values)}") # 1.0

Eliminating errors when calculating arrays

We've already discussed why float in Python loses accuracy and how Decimal deals with this. But what if you need to add a million ordinary real numbers from a database or matrix, and it's not possible to convert everything to heavy Decimal objects due to a performance hit? The math.fsum() function comes to the rescue.

โ€” Eliminating accumulated error: When sequentially adding elements via the standard sum(), the microscopic errors of float are rounded at each step and "accumulate" in the loop. The math.fsum() function tracks intermediate accuracy losses and compensates for them during the calculations.

โ€” High performance: Since the math module is written in C, this function works several times faster than manually iterating through the array or using alternative data types. You get the speed of basic float calculations with near-perfect accuracy.

โ€” Stability in Data Science: This tool is indispensable when working with weights in neural networks, calculating averages of large samples, or processing financial transactions, where speed is important but it's critical not to lose valuable cents and fractions during mass operations.

๐Ÿ #Python #DataScience #Coding #Programming #MathFsum #TechTips

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โค4
Catch a useful trick for working with division in Python ๐Ÿ

divmod() takes two numbers and in a single operation returns a tuple with the quotient and remainder from the division ๐Ÿ“Š

#Python #Coding #Programming #Tech #Tips #Dev

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โค3
Smart counting of elements using collections.Counter ๐Ÿ“Š

from collections import Counter

# Initial list with duplicate elements
logs = ["error", "info", "error", "warning", "error", "info"]

# 1. Instantly count the number of occurrences
count_dict = Counter(logs)
print(count_dict) # Counter({'error': 3, 'info': 2, 'warning': 1})

# 2. Get the most frequent elements (Top-2)
print(count_dict.most_common(2)) # [('error', 3), ('info', 2)]

# 3. Set math for counters
clicks_day1 = Counter(item=4, banner=2)
clicks_day2 = Counter(item=1, banner=5)
# Combine the results of two days in a single operation
print(clicks_day1 + clicks_day2) # Counter({'banner': 7, 'item': 5})

Forget about manual loops and dictionaries ๐Ÿšซ๐Ÿ”„

When you need to count the frequency of words in a text, the distribution of log types, or popular products in a store, developers usually create an empty dictionary and write a loop with a check if key not in dict: dict[key] = 1. The Counter class takes all this dirty work on itself and makes it as efficient as possible.

โ€” Automatic initialization: You no longer need to check if a key exists in the dictionary. If the element is not there, Counter will not throw a KeyError, but simply return 0. ๐Ÿ›ก๏ธ

โ€” Finding leaders without sorting: The most_common(k) method returns a list of the k most frequently occurring elements. Under the hood, Python uses optimized heap algorithms, which work much faster than a full dictionary sort via sorted(). ๐Ÿ†

โ€” Mathematical operations: You can add, subtract, intersect, and merge Counter objects. This turns them into a powerful tool for aggregating metrics and analytics from different data sources in a few lines of code. โž•โž–

#Python #DataScience #Coding #Programming #Automation #DevOps

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โค4๐Ÿ”ฅ1
Python can make a dictionary immutable without copying data!

Usually, to protect configurations and the overall state, a copy of the dictionary is made, which creates unnecessary memory allocations.

safe = dict(config)

MappingProxyType creates a read-only proxy over a dictionary โ€” writing through it becomes impossible, but the data is not copied.

readonly["debug"] = True  # TypeError

At the same time, the proxy remains alive: if the original dictionary changes, the changes will automatically be reflected in the read-only view.

config["debug"] = True

This is especially useful for configurations, internal APIs, overall state, and data protection within libraries.

def get_settings():
return MappingProxyType(settings)

๐Ÿ”ฅ MappingProxyType allows you to provide a read-only view of the dictionary without copying and without the risk of mutation through the returned object.

#Python #Immutable #DataProtection #MappingProxyType #ProgrammingTips #NoCopy

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โค2
The ternary operator in Python looks appealing, but it's easy to overdo it with it ::

'A' if s>=90 else 'B' if s>=80 else 'C' if s>=70 else 'F'

Just because the code can be compressed into one line, doesn't mean it's a good idea for readability.

When the logic starts to branch out (3+ conditions) โ€” the usual if-elif-else becomes much more understandable and easier to maintain.

It's better to leave the ternary operator for simple and short cases:
โ€ข compact expressions in comprehensions
โ€ข small lambda functions
โ€ข simple one-line returns

๐Ÿ’ก #Python #Coding #Programming #Developer #SoftwareEngineering #CodeQuality

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โค1
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๐Ÿ”ฅ Whether you're prepping for #Python, #AI, #Cisco, #PMI, #Fortinet, #AWS, #Azure, #Excel, #Comptia, #ITIL, #Cloud or any other hot certification โ€“ SPOTO has your back with real exam dumps and hands-on training!

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๐Ÿ“‚ Reminder on Python set โ€” set methods!

For example, add() adds an element to the set, update() combines several elements, and intersection() helps quickly find common values between data sets.

In the picture โ€” the main methods and operations for working with set: addition, removal, union, intersection, difference, and set checks.

Save it to not lose it!

#Python #SetMethods #Coding #DataScience #Programming #HelloEncyclo

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10 GitHub Repositories for Web Development in Python ๐Ÿ

Explore the best Python web development repositories for building APIs, full-stack web apps, dashboards, machine learning demos, internal tools, and interactive Python-based user interfaces. ๐Ÿ”ฅ

https://www.kdnuggets.com/10-github-repositories-for-web-development-in-python

#Python #WebDevelopment #GitHub #Coding #API #Tech

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Guessing numbers

This project for beginners in Python is a fun game that generates a random number (within a certain range) that the user must guess after receiving hints.

For each incorrect guess, the user receives additional hints, but at the cost of reducing their overall score.

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