Category: Science & Tech (Page 5 of 35)

How to Quickly Remove Falsy Values from Lists in Python

March 26, 2023 / Fatos Morina / 0 Comments

One of the most attractive features of Python is its readability and conciseness, allowing developers to write elegant and efficient code. In this article, we will explore a Python method called “Compact” that helps remove falsy values from a list using filter().

The Compact method is a simple yet powerful Python function that removes falsy values (False, None, 0, and “”) from a list. It does this by utilizing the filter() function, which returns an iterator that includes only the elements of the list that satisfy a specific condition.

How Non-Empty Lists, Tuples, and Dictionaries are Evaluated to True

March 19, 2023 / Fatos Morina / 0 Comments

When working with conditional statements in Python, it’s important to understand how different data types are evaluated to True or False. In addition to the previously discussed false values such as None, "False", and 0, there are also some specific rules for evaluating lists, tuples, and dictionaries.

In Python, any non-empty list, tuple, or dictionary is evaluated to True, while an empty one is evaluated to False. This means that if you have a list or dictionary that contains at least one element, it will evaluate to True in a conditional statement.

How to Calculate the Time Spent in Python

March 5, 2023 / Fatos Morina / 0 Comments

In programming, it’s important to optimize code for performance. One way to do this is by measuring how long it takes for code to execute. In this blog post, we will explore a Python snippet that can be used to calculate the time it takes to execute a particular piece of code.

Python’s time module provides a simple way to measure the execution time of a program. The time.time() function returns the current time in seconds since the epoch (January 1, 1970, 00:00:00 UTC) as a floating-point number. We can use this function to measure the time before and after a particular piece of code and calculate the difference to get the total time it took to execute the code.

How to Get Default Values for Missing Keys in Python

February 26, 2023 / Fatos Morina / 0 Comments

Working with dictionaries in Python is a common task for many programmers, as it allows them to store and manipulate data in a key-value format. However, sometimes we may need to access a key in a dictionary that does not exist, and we want to provide a default value in such cases. The get() method in Python provides a simple and elegant solution to this problem.

The get() method is used to retrieve the value of a specified key in a dictionary. It takes two parameters: the key to look for and a default value to return if the key is not found in the dictionary. If the key is present in the dictionary, get() returns the corresponding value. Otherwise, it returns the default value specified.

Let’s look at the following code snippet:

dictionary = {'first_element': 1, 'second_element': 2}

print(dictionary.get('third_element', 3))  # 3

In this code, we have a dictionary with two key-value pairs. We then use the get() method to retrieve the value associated with the key 'third_element'. Since this key is not present in the dictionary, the method returns the default value of 3.

How to Perform Math Operations Inside Strings in Python

February 12, 2023 / Fatos Morina / 0 Comments

In Python, it’s possible to perform mathematical operations inside of string literals, using a feature called “f-strings”. F-strings, or “formatted string literals”, allow you to embed expressions inside string literals, which are evaluated at runtime. This allows you to mix variables, arithmetic expressions, and other computations into strings in a very readable and convenient way.

num_val = 42

print(f'{num_val % 2 = }') # num_val % 2 = 0

Here, the f-string '{num_val % 2 = }' is a string literal that contains an expression num_val % 2. The % operator is used to perform the modulo operation, which returns the remainder of the division of one number by another. In this case, num_val % 2 returns the remainder of the division of 42 by 2, which is 0.

How to use try and else block in Python

February 5, 2023 / Fatos Morina / 0 Comments

Python provides a way to handle exceptions through the use of try/except blocks. The syntax of a try/except block is straightforward: you try to run some code in the try block, and if an exception is raised, the code in the except block is executed. This helps you handle potential errors and ensures that your code continues to run even if an error occurs.

How to Use Chained Function Calls in Python

January 29, 2023 / Fatos Morina / 0 Comments

Python is a powerful programming language that offers a wide range of features to make code more readable and concise. One such feature is the ability to chain function calls together in a single line.

Let us briefly write an example and then explain it:

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

a, b = 4, 5
print((subtract if a > b else add)(a, b)) # 9

How to Generate Random IDs in Python

January 22, 2023 / Fatos Morina / 0 Comments

In today’s digital age, unique identification is becoming increasingly important. Whether it’s for security purposes, data management, or simply keeping track of things, having a way to generate unique values is essential. One of the most popular ways to do this is through the use of UUIDs, or Universally Unique Identifiers.

How to Quickly Convert Tuples into Lists in Python

January 15, 2023 / Fatos Morina / 0 Comments

In Python, tuples and lists are two commonly used data structures for storing collections of items.

The main difference between them is that tuples are immutable, meaning their elements cannot be changed after they are created, while lists are mutable, meaning their elements can be modified.

This immutability of tuples makes them more memory efficient and faster than lists since they can be used as keys in a dictionary and in sets.