Python Learning
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Python learning resources Beginner to advanced Python guides, cheatsheets, books and projects. For data science, backend and automation. Join 👉 https://rebrand.ly/bigdatachannels DMCA: @disclosure_bds Contact: @mldatascientist
Последние сообщения
🔥
12 Python Tricks That Make Your Code Cleaner
Here are some Python tricks every developer should know.
1. Swap variables without a temporary variable.
a, b = b, a
2. Reverse a list.
nums[::-1]
3. Chain comparisons.
10 < age < 30
4. Multiple assignment.
x = y = z = 0
5. Unpack lists.
first, *middle, last = nums
6
. Use underscores for ignored values.
name, _, age = data
7. Format strings with f-st
✅
Python Scenario-Based Interview Question – List Comprehension
🐍
Scenario:
You are given a list of numbers:
numbers = [1, 2, 3, 4, 5, 6]
Question:
Write Python code to
create a new list
that contains:
1.
Only the even numbers
from the original list.
2.
Each even number multiplied by 2
.
Expected Output:
Answer:
even_doubled = [num * 2 for num in numbers if num % 2 == 0]
print(even_doubled)
Explan
❌
Five mistakes almost every Python developer makes once
1️⃣
Giving a function a default value that's a list or dictionary.
This one is sneaky because it works in your first few tests and then quietly breaks the moment the function gets called more than once because that default gets created a single time, not fresh on every call, and it silently keeps growing in the background.
2️⃣
Creating a bun
📂
Understanding Python File Modes
When opening a file, the mode determines what you're allowed to do.
Mode
Meaning
r
👉
Read only
w
👉
Write (overwrites existing file)
a
👉
Append to the end
x
👉
Create a new file
rb
👉
Read binary files
wb
👉
Write binary files
r+
👉
Read and write
👉
Using the wrong mode is one of the easiest ways to accidentally erase a file.
Python Lambda Function
📦
The Difference Between a Package and a Module
These terms get mixed up a lot.
📗
A
module
is a single Python file.
math.py
📚
A
package
is a folder containing multiple modules.
utils/
helpers.py
parser.py
formatter.py
Think of it like this:
📖
Module
= One book
📚
Package
= An entire bookshelf
Python Web Scraping
This learning path you’ll learn the core Python technologies and skills you need to build your own web scraper. Web scraping is about downloading structured data from the web and processing selected data.
👉
You should already be comfortable writing Python scripts
🔗
Learn Here
Python List Exercises Guide
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