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Python Tip.

The @dataclass decorator automatically generates standard methods like init, repr, and eq based on the class attributes.

Example 👇

# with dataclass
from dataclasses import dataclass

@dataclass
class Point:
    x: int
    y: int

Here's how it would look without @dataclass:

class Point:
    def __init__(self, x: int, y: int):
        self.x = x
        self.y = y

    def __repr__(self):
        return f"Point(x={self.x}, y={self.y})"

    def __eq__(self, other):
        return (self.x, self.y) == (other.x, other.y)

dataclass saves time and eliminates boilerplate code when a class simply stores data.

👉

@DataScience4

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Mastering Python Generators

🏆

Mastering Python Generators

📢

Unlock the power of Python generators! Learn how these memory-efficient iterators yield items on demand with 20 practical examples.

⚡️

Tap to unlock the complete answer and gain instant insight.

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By: @DataScience4

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Of course! Let's master Python generators. This guide will take you from the absolute basics to advanced, practical applications with 20 distinct examples. 🔰 Mastering Python Generators What is a Generator?

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✖️ MODIFYING A LIST WHILE LOOPING OVER IT SKIPS ITEMS.

Because of this, Python's iterator gets confused. When you remove an element, the next element shifts into its place, but the loop moves on to the next index, causing the shifted element to be skipped entirely.

The code looks logical, but the result is buggy — a classic iteration trap.
Correct — iterate over a copy* of the list, or build a new list.

Follow for more Python tips daily!

# hidden error — removing items while iterating skips elements
numbers = [1, 2, 3, 2, 4, 2, 5]

for num in numbers:
    if num == 2:
        numbers.remove(num) # seems like it should remove all 2s

# a '2' was skipped and remains in the list!
print(numbers)  # [1, 3, 4, 2, 5]

# 🖕 correct version — iterate over a copy
numbers_fixed = [1, 2, 3, 2, 4, 2, 5]

# The [:] makes a crucial copy!
for num in numbers_fixed[:]:
    if num == 2:
        numbers_fixed.remove(num)

print(numbers_fixed)  # [1, 3, 4, 5]

# A more Pythonic way is to use a list comprehension:
# [n for n in numbers if n != 2]

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By: @DataScience4 ✨

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✨ Lazy Imports Land in Python and Other Python News for December 2025 ✨

📖 PEP 810 brings lazy imports to Python 3.15, PyPI tightens 2FA security, and Django 6.0 reaches release candidate. Catch up on all the important Python news!

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✨ bpython | Python Tools ✨

📖 A lightweight, enhanced interactive Python REPL.

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✨ MkDocs | Python Tools ✨

📖 A static site generator for Python projects.

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🔰 For Loop In Python (10 Best Tips & Tricks)

Here are 10 tips to help you write cleaner, more efficient, and more "Pythonic" for loops.

---

1️⃣. Use enumerate() for Index and Value

Instead of using range(len(sequence)) to get an index, enumerate gives you both the index and the item elegantly.

# Less Pythonic 👎
items = ["a", "b", "c"]
for i in range(len(items)):
    print(i, items[i])

# More Pythonic 👍
for i, item in enumerate(items):
    print(i, item)

---

2️⃣. Use zip() to Iterate Over Multiple Lists

To loop through two or more lists at the same time, zip() is the perfect tool. It stops when the shortest list runs out.

names = ["Alice", "Bob", "Charlie"]
ages = [25, 30, 35]

for name, age in zip(names, ages):
    print(f"{name} is {age} years old.")

---

3️⃣. Iterate Directly Over Dictionaries with .items()

To get both the key and value from a dictionary, use the .items() method. It's much cleaner than accessing the key and then looking up the value.

# Less Pythonic 👎
config = {"host": "localhost", "port": 8080}
for key in config:
    print(key, "->", config[key])

# More Pythonic 👍
for key, value in config.items():
    print(key, "->", value)

---

4️⃣. Use List Comprehensions for Simple Loops

If your for loop just creates a new list, a list comprehension is almost always a better choice. It's more concise and often faster.

# Standard for loop
squares = []
for i in range(5):
    squares.append(i * i)
# squares -> [0, 1, 4, 9, 16]

# List comprehension 👍
squares_comp = [i * i for i in range(5)]
# squares_comp -> [0, 1, 4, 9, 16]

---

5️⃣. Use the _ Underscore for Unused Variables

If you need to loop a certain number of times but don't care about the loop variable, use _ as a placeholder by convention.

# I don't need 'i', I just want to repeat 3 times
for _ in range(3):
    print("Hello!")

---

6️⃣. Unpack Tuples Directly in the Loop

If you're iterating over a list of tuples or lists, you can unpack the values directly into named variables for better readability.

points = [(1, 2), (3, 4), (5, 6)]

# Unpacking directly into x and y
for x, y in points:
    print(f"x: {x}, y: {y}")

---

7️⃣. Use break and a for-else Block

A for loop can have an else block that runs only if the loop completes without hitting a break. This is perfect for search operations.

numbers = [1, 3, 5, 7, 9]

for num in numbers:
    if num % 2 == 0:
        print("Even number found!")
        break
else:  # This runs only if the 'break' was never hit
    print("No even numbers in the list.")

---

8️⃣. Iterate Over a Copy to Safely Modify

Never modify a list while you are iterating over it directly. This can lead to skipped items. Instead, iterate over a copy.

# This will not work correctly! 👎
numbers = [1, 2, 3, 2, 4]
for num in numbers:
    if num == 2:
        numbers.remove(num) # Skips the second '2'

# Correct way: iterate over a slice copy [:] 👍
numbers = [1, 2, 3, 2, 4]
for num in numbers[:]:
    if num == 2:
        numbers.remove(num)
print(numbers) # [1, 3, 4]

---

9️⃣. Use reversed() for Reverse Iteration

To loop over a sequence in reverse, use the built-in reversed() function. It's more readable and efficient than creating a reversed slice.

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# Less readable
items = ["a", "b", "c"]
for item in items[::-1]:
    print(item)

# More readable 👍
for item in reversed(items):
    print(item)

---

🔟. Use continue to Skip the Rest of an Iteration

The continue keyword ends the current iteration and moves to the next one. It's great for skipping items that don't meet a condition, reducing nested if statements.

# Using 'if'
for i in range(10):
    if i % 2 == 0:
        print(i, "is even")

# Using 'continue' can be cleaner
for i in range(10):
    if i % 2 != 0:
        continue  # Skip odd numbers
    print(i, "is even")

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By: @DataScience4 ✨

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✨ ptpython | Python Tools ✨

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✨ Pipenv | Python Tools ✨

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https://t.me/DataScience4

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YOU CAN'T USE LAMBDA LIKE THIS IN PYTHON

The main mistake is turning lambda into a logic dump: adding side effects, print calls, long conditions, and calculations to it.

Such lambdas are hard to read, impossible to debug properly, and they violate the very idea of being a short and clean function. Everything complex should be moved into a regular function. Subscribe for more tips every day !

# you can't do this - lambda with state changes
data = [1, 2, 3]
logs = []

# dangerous antipattern
process = lambda x: logs.append(f"processed {x}") or (x * 10)

result = [process(n) for n in data]

print("RESULT:", result)
print("LOGS:", logs)

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Python Cheat Sheet: The Ternary Operator

🚀

Shorten your if/else statements for compact, one-line value selection. It's also known as a conditional expression.

#### 📜 The Standard if/else Block

This is the classic, multi-line way to assign a value based on a condition.

# Check if a user is an adult
age = 20
status = ""

if age >= 18:
    status = "Adult"
else:
    status = "Minor"

print(status)
# Output: Adult

---

#### ✅ The Ternary Operator (One-Line if/else)

The same logic can be written in a single, clean line.

Syntax:
value_if_true if condition else value_if_false

Let's rewrite the example above:

age = 20

# Assign 'Adult' if age >= 18, otherwise assign 'Minor'
status = "Adult" if age >= 18 else "Minor"

print(status)
# Output: Adult

---

💡

More Examples

The ternary operator is an expression, meaning it returns a value and can be used almost anywhere.

1. Inside a Function return

def get_fee(is_member):
    # Return 5 if they are a member, otherwise 15
    return 5.00 if is_member else 15.00

print(f"Your fee is: ${get_fee(True)}")
# Output: Your fee is: $5.0
print(f"Your fee is: ${get_fee(False)}")
# Output: Your fee is: $15.0

2. Inside an f-string or print()

is_logged_in = False

print(f"User status: {'Online' if is_logged_in else 'Offline'}")
# Output: User status: Offline

3. With List Comprehensions (Advanced)

This is where it becomes incredibly powerful for creating new lists.

numbers = [1, 10, 5, 22, 3, -4]

# Create a new list labeling each number as "even" or "odd"
labels = ["even" if n % 2 == 0 else "odd" for n in numbers]
print(labels)
# Output: ['odd', 'even', 'odd', 'even', 'odd', 'even']

# Create a new list of only positive numbers, or 0 for negatives
sanitized = [n if n > 0 else 0 for n in numbers]
print(sanitized)
# Output: [1, 10, 5, 22, 3, 0]

---

🧠

When to Use It (and When Not To!)

• DO use it for simple, clear, and readable assignments. If it reads like a natural sentence, it's a good fit.

• DON'T use it for complex logic or nest them. It quickly becomes unreadable.

❌

BAD EXAMPLE (Avoid This!):

# This is very hard to read!
x = 10
message = "High" if x > 50 else ("Medium" if x > 5 else "Low")

✅

BETTER (Use a standard if/elif/else for clarity):

x = 10
if x > 50:
    message = "High"
elif x > 5:
    message = "Medium"
else:
    message = "Low"

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By: @DataScience4

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