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. Admin: @HusseinSheikho || @Hussein_Sheikho
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Network:📈 Analytical overview of Telegram channel Learn Python Coding
Channel Learn Python Coding (@pythonre) in the English language segment is an active participant. Currently, the community unites 40 871 subscribers, ranking 3 292 in the Technologies & Applications category and 9 285 in the India region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 40 871 subscribers.
According to the latest data from 28 October, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by 351 over the last 30 days and by -15 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 4.54%. Within the first 24 hours after publication, content typically collects 1.43% reactions from the total number of subscribers.
- Post reach: On average, each post receives 1 854 views. Within the first day, a publication typically gains 586 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 3.
- Thematic interests: Content is focused on key topics such as math, harvard, oxford, supervision, waybienad.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“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.
Admin: @HusseinSheikho || @Hussein_Sheikho”
Thanks to the high frequency of updates (latest data received on 29 October, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Technologies & Applications category.
40 871
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Posts Archive
40 871
A bit of #Python basics. Day 8 - Flatten a nested list
I'll show you three (3) ways to flatten a two-dimensional list. The first method uses a
for loop, the second uses the itertools module, and the third uses list comprehension.
⚙️ Using a for loop:
For this method, we use a nested for loop. The outer loop iterates over the inner lists, and the inner loop accesses the elements in the inner lists.
# In [19]:
list1 = [[1, 2, 3],[4, 5, 6]]
newlist = []
for list2 in list1:
for j in list2:
newlist.append(j)
print(newlist)
[1, 2, 3, 4, 5, 6]
⚙️ Using the itertools module:
The itertools.chain.from_iterable() function from the itertools module can be used to flatten a nested list. This method may not be suitable for deeply nested lists.
# In [20]:
import itertools
list1 = [[1, 2, 3],[4, 5, 6]]
flat_list = list(itertools.chain.from_iterable(list1))
print(flat_list)
[1, 2, 3, 4, 5, 6]
You can see that the nested loop has been flattened.
⚙️ Using list comprehension
If you don't want to import itertools or write a regular for loop, you can simply use list comprehension.
# In [21]:
list1 = [[1, 2, 3], [4, 5, 6]]
flat_list = [i for j in list1 for i in j]
print(flat_list)
[1, 2, 3, 4, 5, 6]
List comprehension is well suited for moderately nested lists. For deeply nested lists, it is not suitable, as the code becomes harder to read.
⚙️ Using a generator function
You can create a generator function that yields elements from the nested list, and then convert the generator into a list.
# In [22]:
def flatten_generator(nested_list):
for sublist in nested_list:
for item in sublist:
yield item
list1 = [[1, 2, 3], [4, 5, 6]]
flat_list = list(flatten_generator(list1))
flat_listOut[22]: [1, 2, 3, 4, 5, 6]
The generator method is suitable for flattening large or deeply nested lists. This is because generators are memory-efficient.
👉 https://t.me/DataScience4
40 871
Repost from Machine Learning with Python
reversed() in Python - what supports it and what doesn't
The function reversed() is built-in in Python, but it doesn't work with all data types
✓ Lists - it works
reversed([1, 2, 3]) returns an iterator
list(reversed([1, 2, 3])) → [3, 2, 1]
✓ Tuples - it also works
reversed((1, 2, 3)) can be easily iterated
✗ Sets - not supported
reversed({1, 2, 3}) → TypeError
Why? Sets don't have a fixed order, so they can't be "reversed"
If you need to reverse a set:
list(reversed(list({1, 2, 3})))
40 871
⚡️ Python code that works, but does extra work 100 times over
This Python code looks normal.
It works.
It passes the tests.
But it does extra work dozens, and sometimes hundreds of times.
The most common reason is that you accidentally turn a linear algorithm into a quadratic one.
A typical scenario:
- there's a list
- inside the loop, you repeatedly do in, count, index
- everything works quickly with small data
- on real data, the application starts to "slow down for no reason"
The problem is that:
- list is O(n) for searching
- searching inside the loop = O(n²)
- Python honestly does the work you asked it to do
Pros don't think about "whether it works or not", but how many extra operations are being performed.
The correct approach:
- if you need membership checks, use set
- if you're counting elements, use dict or Counter
- if the data doesn't change, pre-calculate it once
This technique is one of the most common sources of hidden performance bugs in Python code.
# ❌ Bad: O(n²)
users = ["alice", "bob", "carol", "dave"]
for u in users:
if u in users: # full list traversal every time
process(u)
# ✅ Good: O(n)
users = ["alice", "bob", "carol", "dave"]
users_set = set(users)
for u in users:
if u in users_set:
process(u)40 871
A bit of Python basics. Day 7. Counting the number of occurrences of an element
If you need to find out how many times an element appears in an iterable collection, you can use the
Counter class from the collections module. Counter() returns a dictionary with the number of times each element appears in the sequence. Let's say we want to find out how many times the name Peter appears in the following list. We can use Counter(). See below:
from collections import Counter
list1 = ['John', 'Kelly', 'Peter', 'Moses', 'Peter']
count_peter = Counter(list1).get("Peter")
print(f'The name "Peter" appears in the list '
f'{count_peter} times.')The name "Peter" appears in the list 2 times.
Another way to do this is with a regular for loop. We create a count variable and increase it by 1 each time we find the name Peter in the sequence. This is a naive approach. See below:
list1 = ['John', 'Kelly', 'Peter', 'Moses', 'Peter']
# Create a count variable
count = 0
for name in list1:
if name == 'Peter':
count +=1
print(f'The name "Peter" appears in the list'
f' {count} times.')The name "Peter" appears in the list 2 times.
Lists and other iterable data structures in Python have a built-in count() method, which allows us to count the number of occurrences of a specific element. We can use count() to count how many times Peter appears in the list.
list1 = ['John', 'Kelly', 'Peter', 'Moses', 'Peter']
print(f'The name "Peter" appears in the list '
f'{list1.count("Peter")} times.')The name "Peter" appears in the list 2 times.
👉 https://t.me/DataScience4
40 871
✨ Quiz: Dependency Management With Python Poetry ✨
📖 Test your knowledge of Python Poetry, from installation and virtual environments to lock files, dependency groups, and updates.
🏷️ #intermediate #best-practices #devops #tools
40 871
✨ OpenCode | AI Coding Tools ✨
📖 An open-source terminal AI coding agent with support for over 75 AI models and IDE integrations.
🏷️ #Python
40 871
✨ Build Your Weekly Python Study Schedule: 7 Days to Consistent Progress ✨
📖 Create a weekly Python study schedule you can stick to. Build a realistic 7-day plan, stay consistent, and turn learning Python into a sustainable habit.
🏷️ #basics #career
40 871
This channels is for Programmers, Coders, Software Engineers.
0️⃣ Python
1️⃣ Data Science
2️⃣ Machine Learning
3️⃣ Data Visualization
4️⃣ Artificial Intelligence
5️⃣ Data Analysis
6️⃣ Statistics
7️⃣ Deep Learning
8️⃣ programming Languages
✅ https://t.me/addlist/8_rRW2scgfRhOTc0
✅ https://t.me/Codeprogrammer
40 871
A bit of Python basics. Day 6 - Exchanging variable values
In Python, you can swap variables after they have already been assigned objects. Below, we first assign
20 to the variable x and 30 to the variable y, and then swap them: x becomes 30, and y becomes 20. This method is called tuple packing/unpacking.
x, y = 20, 30
x, y = y, x
print('x is: ', x)
print('y is: ', y)x is 30
y is 20
You can also use the XOR (exclusive or) operator to swap variables. This is a three-step method. In the example below, we swap the values of x and y.
x = 20
y = 30
# step one
x ^= y
# step two
y ^= x
# step three
x ^= y
print(f'x is: {x}')
print(f'y is: {y}')x is: 30
y is: 20
You can also use arithmetic operations (addition and subtraction) to swap variables without a temporary variable. However, this method is recommended for swapping numeric data types. Here's an example:
# Use arithmetic operations
x = 5
y = 10
x = x + y
y = x - y
x = x - y
print("After swapping:")
print("x =", x)
print("y =", y)After swapping:
x = 10
y = 5
As a result of these arithmetic operations, the values of x and y have actually been swapped. After the swap, x contains the original value of y (10), and y contains the original value of x (5).
This method of swapping variables without a temporary variable is based on the fact that when you add or subtract the value of one variable from another, you can effectively swap their values without the need for additional storage.
👉 https://t.me/DataScience4
40 871
✨ Quiz: Hands-On Python 3 Concurrency With the asyncio Module ✨
📖 Test your asyncio skills with a focused quiz on coroutines, event loops, generators, and IO-bound concurrency in Python 3.
🏷️ #advanced #python
40 871
✨ Lovable | AI Coding Tools ✨
📖 An AI-powered full-stack platform that generates and deploys web applications from natural language descriptions.
🏷️ #Python
40 871
✨ Gift Cards ✨
📖 Give the Gift of Real Python with a membership gift card. An easy way to give joy to the Pythonistas in your life.
🏷️ #Python
40 871
✨ How to Run Your Python Scripts and Code ✨
📖 Learn how to run Python scripts from the command line, REPL, IDEs, and file managers on Windows, Linux, and macOS. Master all execution approaches.
🏷️ #basics #best-practices #devops #python
40 871
✨ graphical user interface (GUI) | Python Glossary ✨
📖 A visual way of interacting with a program through windows, buttons, and other on-screen elements.
🏷️ #Python
