✨ activation function | AI Coding Glossary ✨

📖 A nonlinear mapping applied to neuron inputs that enables neural networks to learn complex relationships.

🏷️ #Python

✨ recurrent neural network (RNN) | AI Coding Glossary ✨

📖 A neural network that processes sequences by applying the same computation at each step.

🏷️ #Python

✨ prompt injection | AI Coding Glossary ✨

📖 An attack where adversarial text is crafted to steer a model or model-integrated app into ignoring its original instructions and performing unintended actions.

🏷️ #Python

✨ retrieval-augmented generation (RAG) | AI Coding Glossary ✨

📖 A technique that improves a model’s outputs by retrieving relevant external documents at query time and feeding them into the model.

🏷️ #Python

✨ Logging in Python ✨

📖 If you use Python's print() function to get information about the flow of your programs, logging is the natural next step. Create your first logs and curate them to grow with your projects.

🏷️ #intermediate #best-practices #tools

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💡 Python Tips Part 1

A collection of essential Python tricks to make your code more efficient, readable, and "Pythonic." This part covers list comprehensions, f-strings, tuple unpacking, and using enumerate.

# Create a list of squares from 0 to 9
squares = [x**2 for x in range(10)]

print(squares)
# Output: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

• List Comprehensions: A concise and often faster way to create lists. The syntax is [expression for item in iterable].

name = "Alex"
score = 95.5

# Using an f-string for easy formatting
message = f"Congratulations {name}, you scored {score:.1f}!"

print(message)
# Output: Congratulations Alex, you scored 95.5!

• F-Strings: The modern, readable way to format strings. Simply prefix the string with f and place variables or expressions directly inside curly braces {}.

numbers = (1, 2, 3, 4, 5)

# Unpack the first, last, and middle elements
first, *middle, last = numbers

print(f"First: {first}")   # 1
print(f"Middle: {middle}") # [2, 3, 4]
print(f"Last: {last}")     # 5

• Extended Unpacking: Use the asterisk * operator to capture multiple items from an iterable into a list during assignment. It's perfect for separating the "head" and "tail" from the rest.

items = ['keyboard', 'mouse', 'monitor']

for index, item in enumerate(items):
    print(f"Item #{index}: {item}")

# Output:
# Item #0: keyboard
# Item #1: mouse
# Item #2: monitor

• Using enumerate: The Pythonic way to get both the index and the value of an item when looping. It's much cleaner than using range(len(items)).

#Python #Programming #CodeTips #PythonTricks

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By: @DataScience4 ✨

💡 Python Tips Part 2

More essential Python tricks to improve your code. This part covers dictionary comprehensions, the zip function, ternary operators, and using underscores for unused variables.

# Create a dictionary of numbers and their squares
squared_dict = {x: x**2 for x in range(1, 6)}

print(squared_dict)
# Output: {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}

• Dictionary Comprehensions: A concise way to create dictionaries, similar to list comprehensions. The syntax is {key_expr: value_expr for item in iterable}.

students = ["Alice", "Bob", "Charlie"]
scores = [88, 92, 79]

for student, score in zip(students, scores):
    print(f"{student}: {score}")

# Output:
# Alice: 88
# Bob: 92
# Charlie: 79

• Using zip: The zip function combines multiple iterables (like lists or tuples) into a single iterator of tuples. It's perfect for looping over related lists in parallel.

age = 20

# Assign a value based on a condition in one line
status = "Adult" if age >= 18 else "Minor"

print(status)
# Output: Adult

• Ternary Operator: A shorthand for a simple if-else statement, useful for conditional assignments. The syntax is value_if_true if condition else value_if_false.

# Looping 3 times without needing the loop variable
for _ in range(3):
    print("Hello, Python!")

# Unpacking, but only needing the last value
_, _, last_item = (10, 20, 30)
print(last_item) # 30

• Using Underscore _: By convention, the underscore _ is used as a variable name when you need a placeholder but don't intend to use its value. This signals to other developers that the variable is intentionally ignored.

#Python #Programming #CodeTips #PythonTricks

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By: @DataScience4 ✨

💡 Python Tips Part 3

Advancing your Python skills with more powerful techniques. This part covers safe dictionary access with .get(), flexible function arguments with *args and **kwargs, and context managers using the with statement.

user_data = {"name": "Alice", "age": 30}

# Safely get a key that exists
name = user_data.get("name")

# Safely get a key that doesn't exist by providing a default
city = user_data.get("city", "Not Specified")

print(f"Name: {name}, City: {city}")
# Output: Name: Alice, City: Not Specified

• Dictionary .get() Method: Access dictionary keys safely. .get(key, default) returns the value for a key if it exists, otherwise it returns the default value (which is None if not specified) without raising a KeyError.

def dynamic_function(*args, **kwargs):
    print("Positional args (tuple):", args)
    print("Keyword args (dict):", kwargs)

dynamic_function(1, 'go', True, user="admin", status="active")
# Output:
# Positional args (tuple): (1, 'go', True)
# Keyword args (dict): {'user': 'admin', 'status': 'active'}

• *args and **kwargs: Use these in function definitions to accept a variable number of arguments. *args collects positional arguments into a tuple, and **kwargs collects keyword arguments into a dictionary.

# The 'with' statement ensures the file is closed automatically
try:
    with open("notes.txt", "w") as f:
        f.write("Context managers are great!")
    # No need to call f.close()
    print("File written and closed.")
except Exception as e:
    print(f"An error occurred: {e}")

• The with Statement: The with statement creates a context manager, which is the standard way to handle resources like files or network connections. It guarantees that cleanup code is executed, even if errors occur inside the block.

#Python #Programming #CodeTips #PythonTricks

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By: @DataScience4 ✨

💡 Python Tips Part 4

Level up your Python code with more advanced tips. This part covers chaining comparisons, using sets for uniqueness, and powerful tools from the collections module like Counter and defaultdict.

x = 10

# Check if x is between 5 and 15 in a clean way
if 5 < x < 15:
    print("x is in range.")

# Output: x is in range.

• Chaining Comparisons: Python allows you to chain comparison operators for more readable and concise range checks. This is equivalent to (5 < x) and (x < 15).

numbers = [1, 2, 2, 3, 4, 4, 4, 5]

# Use a set to quickly get unique elements
unique_numbers = list(set(numbers))

print(unique_numbers)
# Output: [1, 2, 3, 4, 5]

• Sets for Uniqueness: Sets are unordered collections of unique elements. Converting a list to a set and back is the fastest and most Pythonic way to remove duplicates.

from collections import Counter

words = ['apple', 'banana', 'apple', 'orange', 'banana', 'apple']
word_counts = Counter(words)

print(word_counts)
# Output: Counter({'apple': 3, 'banana': 2, 'orange': 1})
print(word_counts.most_common(1))
# Output: [('apple', 3)]

• collections.Counter: A specialized dictionary subclass for counting hashable objects. It simplifies frequency counting tasks and provides useful methods like .most_common().

from collections import defaultdict

data = [('fruit', 'apple'), ('fruit', 'banana'), ('veg', 'carrot')]
grouped_data = defaultdict(list)

for category, item in data:
    grouped_data[category].append(item)

print(grouped_data)
# Output: defaultdict(<class 'list'>, {'fruit': ['apple', 'banana'], 'veg': ['carrot']})

• collections.defaultdict: A dictionary that provides a default value for a non-existent key, avoiding KeyError. It's perfect for grouping items into lists or dictionaries without extra checks.

#Python #Programming #CodeTips #DataStructures

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By: @DataScience4 ✨

💡 Python True & False: A Mini-Guide

This guide covers Python's boolean values, True and False. We'll explore how they result from comparisons, are used with logical operators, and how other data types can be evaluated as "truthy" or "falsy".

x = 10
y = 5

print(x > y)
print(x == 10)
print(y != 5)
# Output:
# True
# True
# False

• Comparison Operators: Operators like >, ==, and != evaluate expressions and always return a boolean value: True or False.

is_sunny = True
is_warm = False

print(is_sunny and is_warm)
print(is_sunny or is_warm)
print(not is_warm)
# Output:
# False
# True
# True

• Logical and: Returns True only if both operands are true.
• Logical or: Returns True if at least one operand is true.
• Logical not: Inverts the boolean value (True becomes False, and vice-versa).

# "Falsy" values evaluate to False
print(bool(0))
print(bool(""))
print(bool([]))
print(bool(None))

# "Truthy" values evaluate to True
print(bool(42))
print(bool("hello"))
# Output:
# False
# False
# False
# False
# True
# True

• Truthiness: In a boolean context (like an if statement), many values are considered True ("truthy").
• Falsiness: Only a few specific values are False ("falsy"): 0, None, and any empty collection (e.g., "", [], {}).

# Booleans can be treated as integers
sum_result = True + True + False
print(sum_result)

product = True * 15
print(product)
# Output:
# 2
# 15

• Internally, True is equivalent to the integer 1 and False is equivalent to 0.
• This allows you to use them in mathematical calculations, a common feature in coding challenges.

#Python #Boolean #Programming #TrueFalse #CodingTips

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By: @DataScience4 ✨

✨ tagging | AI Coding Glossary ✨

📖 The process of assigning one or more discrete labels to data items so that models and tools can learn from them.

🏷️ #Python

✨ guardrails | AI Coding Glossary ✨

📖 Application-level policies and controls that constrain how a model or agent behaves.

🏷️ #Python

Python: How to easily upload a file via SSH

Want to upload a file to a remote server via SSH directly from a Python noscript? It's easy to do with the paramiko library - it provides a clean and reliable implementation of the SSH protocol.

Just install paramiko (pip install paramiko), specify the connection details, and use an SFTP session to send the file.

Make sure the user has write permissions to the target directory on the server. Subscribe for more tips every day!

import paramiko 

Connection settings 
hostname = "your-server.com"
port = 22
username = "your_username"
password = "your_password"  # or use a key instead of a password 

Local and remote paths 
local_file = "local_file.txt"
remote_file = "/remote/path/local_file.txt" 

Create SSH client 
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) 

try:
    ssh.connect(hostname, port=port, username=username, password=password) 

# Open SFTP session and upload the file
sftp = ssh.open_sftp()
sftp.put(local_file, remote_file)
sftp.close()

print("File uploaded successfully!")
except Exception as e:
    print(f"Error: {e}")
finally:
    ()

https://news.1rj.ru/str/DataScience4

💡 Python Exam Cheatsheet

A quick review of core Python concepts frequently found in technical assessments and exams. This guide covers list comprehensions, dictionary methods, enumerate, and flexible function arguments.

# Create a list of squares for even numbers from 0 to 9
squares = [x**2 for x in range(10) if x % 2 == 0]
print(squares)

# Output:
# [0, 4, 16, 36, 64]

• List Comprehension: A concise, one-line syntax for creating lists.
• The structure is [expression for item in iterable if condition].
• The if condition part is optional and acts as a filter.

student_scores = {'Alice': 95, 'Bob': 87}

# Safely get a score, providing a default value if the key is missing
charlie_score = student_scores.get('Charlie', 'Not Found')
alice_score = student_scores.get('Alice', 'Not Found')

print(f"Alice: {alice_score}")
print(f"Charlie: {charlie_score}")

# Output:
# Alice: 95
# Charlie: Not Found

• Dictionary .get() Method: Safely access a dictionary key without causing a KeyError.
• The first argument is the key to look up.
• The optional second argument is the default value to return if the key does not exist.

colors = ['red', 'green', 'blue']

for index, value in enumerate(colors):
    print(f"Index: {index}, Value: {value}")

# Output:
# Index: 0, Value: red
# Index: 1, Value: green
# Index: 2, Value: blue

• Using enumerate: The Pythonic way to loop over an iterable when you need both the index and the value.
• It returns a tuple (index, value) for each item in the sequence.

def process_data(*args, **kwargs):
    print(f"Positional args (tuple): {args}")
    print(f"Keyword args (dict): {kwargs}")

process_data(1, 'hello', 3.14, user='admin', status='active')

# Output:
# Positional args (tuple): (1, 'hello', 3.14)
# Keyword args (dict): {'user': 'admin', 'status': 'active'}

• *args: Collects all extra positional arguments into a tuple.
• **kwargs: Collects all extra keyword arguments into a dictionary.
• This pattern allows a function to accept a variable number of arguments.

#Python #PythonExam #Programming #CodeCheatsheet #LearnPython

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By: @DataScience4 ✨

Clean Code Tip:

The with statement simplifies resource management, like file handling. It ensures resources are automatically closed, even if errors occur. This prevents bugs and makes your code safer and cleaner than manual try...finally blocks. It's a must-know for any Python developer! 🔐

Example:

# The old, verbose way to ensure a file is closed
print("--- Old Way ---")
file = open('greeting.txt', 'w')
try:
    file.write('Hello, world!')
finally:
    # This block always runs to ensure the file is closed
    print("File is being closed in 'finally' block.")
    file.close()


# The clean, safe, and Pythonic way using 'with'
print("\n--- Clean Way ---")
with open('greeting.txt', 'w') as file:
    file.write('Hello, Python!')
    print("Inside 'with' block. File is still open here.")

# The file is now automatically and safely closed.
print("Outside 'with' block. File is guaranteed to be closed.")

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By: @DataScience4 ✨

Clean Code Tip:

When you need both the index and the item while looping, avoid manual index counters. Use Python's built-in enumerate() function for cleaner, more readable, and less error-prone code. It's the Pythonic way to count! 🔢

Example:

# The old, manual way to track an index
print("--- Old Way ---")
fruits = ['apple', 'banana', 'cherry']
index = 0
for fruit in fruits:
    print(f"Index: {index}, Fruit: {fruit}")
    index += 1


# The clean and Pythonic way using enumerate()
print("\n--- Clean Way ---")
for index, fruit in enumerate(fruits):
    print(f"Index: {index}, Fruit: {fruit}")


# You can even start counting from a different number!
print("\n--- Starting from 1 ---")
for position, fruit in enumerate(fruits, start=1):
    print(f"Position: {position}, Fruit: {fruit}")

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By: @DataScience4 ✨

Clean Code Tip:

For reusable setup and teardown logic, you can create your own context managers. Instead of writing a full class with __enter__ and __exit__, use the @contextmanager decorator from the contextlib module for a more concise and elegant solution. This is a pro-level technique for robust resource management. 🚀

Example:

import contextlib

# The verbose, class-based way to create a context manager
class DatabaseConnection:
    def __init__(self, db_name):
        self._db_name = db_name
        self._conn = None
        print(f"Initializing connection to {self._db_name}...")

    def __enter__(self):
        print("-> Entering context: Opening connection.")
        self._conn = f"CONNECTION_TO_{self._db_name}" # Simulate connection
        return self._conn

    def __exit__(self, exc_type, exc_val, exc_tb):
        print("<- Exiting context: Closing connection.")
        self._conn = None # Simulate closing

print("--- Class-Based Way ---")
with DatabaseConnection("users.db") as conn:
    print(f"   Performing operations with {conn}")


# The clean, Pythonic way using a generator and @contextmanager
@contextlib.contextmanager
def managed_database(db_name):
    print(f"Initializing connection to {db_name}...")
    conn = f"CONNECTION_TO_{db_name}"
    try:
        print("-> Entering context: Yielding connection.")
        yield conn # The code inside the 'with' block runs here
    finally:
        # This code is guaranteed to run, just like __exit__
        print("<- Exiting context: Closing connection in 'finally'.")
        conn = None

print("\n--- @contextmanager Way ---")
with managed_database("products.db") as conn:
    print(f"   Performing operations with {conn}")

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By: @DataScience4 ✨

Clean Code Tip:

Writing classes just to hold data often requires boilerplate methods like __init__, __repr__, and __eq__. The @dataclass decorator automates this! By simply declaring typed fields, you get a full-featured class, making your code significantly shorter, more readable, and less prone to errors. 📦

Example:

from dataclasses import dataclass

# The old, verbose way with manual boilerplate
class PointOld:
    def __init__(self, x: int, y: int):
        self.x = x
        self.y = y

    # Without this, printing the object is unhelpful
    def __repr__(self):
        return f"PointOld(x={self.x}, y={self.y})"

    # Without this, comparison checks for object identity, not value
    def __eq__(self, other):
        if not isinstance(other, PointOld):
            return NotImplemented
        return self.x == other.x and self.y == other.y

print("--- Old Way ---")
p1_old = PointOld(10, 20)
p2_old = PointOld(10, 20)
print(f"Object representation: {p1_old}")
print(f"Are they equal? {p1_old == p2_old}")


# The clean, modern way using @dataclass
@dataclass
class PointNew:
    x: int
    y: int
    # __init__, __repr__, and __eq__ are all generated automatically!

print("\n--- Clean @dataclass Way ---")
p1_new = PointNew(10, 20)
p2_new = PointNew(10, 20)
print(f"Object representation: {p1_new}")
print(f"Are they equal? {p1_new == p2_new}")

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By: @DataScience4 ✨