Programming FlashCards - Learn Coding Concepts

StandardScaler

Demonstrates feature scaling using StandardScaler from scikit-learn. It scales numerical features to have zero mean and unit variance, which can improve the performance of many machine learning algorithms.

Sklearn

Train Test Split

Splitting data into training and testing sets using `train_test_split`. Training a Logistic Regression model and evaluating its performance using accuracy score.

Kubernetes

Create Namespace

This YAML file creates a Kubernetes Namespace named 'my-namespace'. Namespaces provide a way to divide cluster resources between multiple users or teams.

Kubernetes

Create Deployment

This command creates a Kubernetes deployment named 'my-nginx' using the 'nginx' image. It specifies that three replicas (pods) should be running.

Python

Default Argument

Demonstrates a Python function definition with a default argument. The `greet` function takes a name and an optional greeting. If no greeting is provided, it defaults to "Hello".

MySQL

Create Table

Creates a table named 'employees' with columns for id (primary key, auto-incrementing), first name, last name, email (unique), hire date, and salary. Defines data types and constraints.

MySQL

Table Creation

Creates a table named 'employees' with columns for id (primary key, auto-incrementing), first_name, last_name, email (unique), hire_date, and salary. Specifies data types and constraints like NOT NULL and UNIQUE.

Shell

Unset Check

Checks if a variable is unset or empty using the '-z' operator. 'unset' removes a variable, making it unavailable. This is useful for conditional logic based on variable existence.

Shell

Variable Expansion

Demonstrates accessing the value of a shell variable. Both $VAR and ${VAR} are valid ways to expand a variable. The curly braces are useful for disambiguation when the variable name is immediately followed by other characters.

Matplotlib

Custom Markers

Creates a scatter plot with custom 'x' markers, red color, and larger size. Demonstrates customization of marker style, color, and size using `marker`, `color`, and `s` parameters in `plt.scatter()`. Includes labels, title, and grid.

Matplotlib

Scatter Plot

Creating a scatter plot with random data, varying sizes, and colors using Matplotlib. Demonstrates customization of scatter plot elements.

Python

Custom Exceptions

This code demonstrates how to define and raise custom exceptions in Python. It defines a base exception class and two specific exception classes for values that are too small or too large.

Python

Try Except Finally

This code demonstrates exception handling in Python. It attempts a division, catches a potential ZeroDivisionError, and uses a finally block to ensure code execution regardless of exceptions.

Linux

Force Kill PID

Forcefully terminates all processes matching 'process_name'. Useful when a process becomes unresponsive and needs immediate termination. Use with caution as it doesn't allow the process to clean up.

JavaScript

Inheritance

This example demonstrates inheritance in JavaScript. The `Dog` class inherits from the `Animal` class, extending its functionality and overriding the `speak` method. The `super()` keyword is used to call the constructor of the parent class.

JavaScript

JavaScript Class

Demonstrates a basic class in JavaScript. It defines a `Dog` class with a constructor and a `bark` method. An instance of the class is then created and its properties and methods are accessed.

CSS

:visited

The :visited pseudo-class styles links that the user has already visited. This allows users to easily distinguish between visited and unvisited links.

CSS

::first-letter

The ::first-letter pseudo-element is used to add special styles to the first letter of the first line of a text. In this example, the first letter of every paragraph will be purple and twice the normal size, and floating to the left.

HTML

Styled Figure

Figures can contain more complex content and the figcaption can be styled for emphasis. Use semantic HTML to structure content logically and improve accessibility.

HTML

Figure Caption

The

element encapsulates an image with its caption. The

provides a description, enhancing accessibility and context.

Pandas

Multi-Index Pivot

Create a pivot table with multiple index columns ('Region', 'Product'), 'Year' as columns, calculate total sales, and add row/column margins for grand totals.

Pandas

Pivot Table Example

Creating a pivot table to summarize sales data by date and category, showing the sum of values for each combination. Demonstrates basic pivot table functionality.

Jenkins

Disable User

Demonstrates disabling a user in Jenkins using the Jenkins API. Disabling prevents the user from logging in without deleting their account.

Jenkins

Create User

Illustrates a Python function to create a new user in Jenkins, taking username, password, and email as input. This is a simplified representation and would require actual Jenkins API interaction for full functionality.

Docker

Run Redis Alpine

Runs a Redis server in detached mode using the lightweight Alpine Linux-based Redis image, naming the container 'my_redis' for easy management.

Docker

Run Nginx

Runs an Nginx web server in a detached mode (-d), maps port 80 on the host to port 80 on the container, names the container 'web', and uses the 'nginx' image.

Sklearn

GPR Regression

Demonstrates Gaussian Process Regression with an RBF kernel to model a sinusoidal function. The code fits a Gaussian Process Regressor to a sample of a sine wave and then predicts values with uncertainty estimates (standard deviation).

Sklearn

GPR Example

Demonstrates Gaussian Process Regression with an RBF kernel. It initializes a GPR model, fits it to sample data, and predicts values along with their standard deviations.

Cybersecurity

HTTP Flag Search

This Wireshark display filter searches within the HTTP data of the followed TCP stream for packets containing the string "flag=". Useful for quickly identifying potential flags or sensitive information transmitted in HTTP requests or responses.

Cybersecurity

TCP Stream Filter

Wireshark filter to isolate and follow TCP stream number 5, useful for analyzing specific network conversations.

JavaScript

First/Last Child

Access the first and last element children of an element using `firstElementChild` and `lastElementChild`. These properties are useful for quickly selecting the first or last node within a parent element's children.

JavaScript

DOM Traversal

DOM traversal example using parentNode, children, firstElementChild, and lastElementChild to navigate the DOM tree from a starting element.

Pandas

Labeled Scatter

Create a scatter plot and add labels to each point using annotations. This helps identify and distinguish individual data points based on a categorical variable.

Pandas

Size Scatter

Creates a scatter plot where the size of each point varies based on a third variable. This example uses a Pandas DataFrame to store x, y coordinates, and size data. The 's' parameter in plt.scatter controls the size of the markers.

MongoDB

Write Error Handling

Illustrates error handling for write operations in MongoDB. The code attempts to update a document and specifies a write concern. If the write fails to propagate to a majority of nodes within 5 seconds, a try-catch block captures and prints the error.

MongoDB

Write Concern

This MongoDB command inserts a document with write concern set to acknowledge writes to a majority of voting members within a timeout of 100 milliseconds. If the write concern is not met, an error is raised.

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Filter by Technology

StandardScaler

Train Test Split

Create Namespace

Create Deployment

Default Argument

Create Table

Table Creation

Unset Check

Variable Expansion

Custom Markers

Scatter Plot

Custom Exceptions

Try Except Finally

Force Kill PID

Inheritance

JavaScript Class

:visited

::first-letter

Styled Figure

Figure Caption

Multi-Index Pivot

Pivot Table Example

Disable User

Create User

Run Redis Alpine

Run Nginx

GPR Regression

GPR Example

HTTP Flag Search

TCP Stream Filter

First/Last Child

DOM Traversal

Labeled Scatter

Size Scatter

Write Error Handling

Write Concern