Python Archives - Machine Learning Plus

Decorators in Python – How to enhance functions without changing the code?

Leave a Comment / Python / By Selva Prabhakaran

Decorators in python allow you to dynamically change the functionality of another function, without altering it’s code. What? Is that possible? Yes. This covers: 1. What is a decorator and how to create one? 2. Easier way to decorate functions 3. Class decorators 4. Problem with docstrings on decorated functions and how to solve. What …

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Generators in Python – How to lazily return values only when needed and save memory?

Leave a Comment / Python / By Selva Prabhakaran

Generators in python provide an efficient way of generating numbers or objects as and when needed, without having to store all the values in memory beforehand. Introduction You can think of Generators as a simple way of creating iterators without having to create a class with __iter__() and __next__() methods. So how to create a …

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Iterators in Python – What are Iterators and Iterables?

Leave a Comment / Python / By Selva Prabhakaran

Iterable in Python is any object that can be looped over. In order for an iterable to be looped over, an iterable needs to be converted to an iterator using the __iter__() method. Once created, it is actually the iterator that gets iterated over. This is also what happens internally when you run a for-loop. …

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Python Module – What are modules and packages in python?

Leave a Comment / Python / By Selva Prabhakaran

Any Python file with a .py extension is a Module in Python. A python package is a collection of such modules along with a __init__.py file. Let’s understand how to work with modules and packages with clear examples. Introduction When you work on python projects, it’s not a good practice to have all you python …

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Object Oriented Programming (OOPS) in Python

Leave a Comment / Python / By Selva Prabhakaran

Object oriented programming is an effective way of writing code. You create classes which are python objects, that represented meaningful entities which defines its own behaviour (via methods) and attributes. Let’s understand what a class is and the concepts behind Object Oriented Programming in Python Everything you have encountered so far in Python, such as …

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How to use Numpy Random Function in Python

Leave a Comment / Numpy / By MachineLearningPlus

How to use numpy.random.rand() function ? numpy.random.rand() function is used to generate random float values from an uniform distribution over [0,1). These values can be extracted as a single value or in arrays of any dimension. In this article, you will learn about various use cases of this function. Structural overview of numpy.random.rand() Syntax: numpy.random.rand(d0, …

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Simulated Annealing Algorithm Explained from Scratch (Python)

Leave a Comment / Machine Learning / By Naveen James

Partial Correlation

Leave a Comment / Statistics / By Naveen James

What is Partial Correlation and it’s purpose Partial correlation is used to find the correlation between two variables (typically a dependent and an independent variable) with the effect of other influencing variables being controlled. For example, if there are three variables ‘A’, ‘B’, ‘Z’, If you want to find the relationship between ‘A’ and ‘B’ …

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Chi-Square test – How to test statistical significance for categorical data?

Leave a Comment / Statistics / By Naveen James

What is chi-square test and its purpose? Chi-square test was invented in the year ‘1900’ by the revered mathematician ‘Karl Pearson’. Chi-square test, also written as χ2 test is used to determine whether there is a statistically significant difference between the observed frequency and the expected frequency in one or more categories of the contingency …

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Numpy Reshape – How to reshape arrays and what does -1 mean?

Leave a Comment / Python / By MachineLearningPlus

How to reshape a numpy array? The numpy.reshape() function is used to reshape a numpy array without changing the data in the array. It is a very common practice to reshape arrays to make them compatible for further calculations.

Pandas Sample – Randomly Sample Rows From Dataframe

Leave a Comment / Pandas / By MachineLearningPlus

Use the pandas.DataFrame.sample() method from pandas library to randomly select rows from a DataFrame Randomly selecting rows can be useful for inspecting the values of a DataFrame.

Pandas Iterate Over Rows

Leave a Comment / Pandas / By MachineLearningPlus

Pandas DataFrame is used very popularly to store tabular data. Very often, we need to iterate over rows of the dataframe to perform various operations. This is a way of navigating the DatraFrame.

Pandas Describe

Leave a Comment / Pandas / By MachineLearningPlus

How to use Pandas Describe function? The pandas.describe function is used to get a descriptive statistics summary of a given dataframe. This includes mean, count, std deviation, percentiles, and min-max values of all the features. On applying pandas describe function to a dataframe, the result is also returned as a dataframe . This dataframe will …

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Pandas Dataframe.duplicated()

Leave a Comment / Pandas / By MachineLearningPlus

The pandas.DataFrame.duplicated() method is used to find duplicate rows in a DataFrame. It returns a boolean series which identifies whether a row is duplicate or unique. In this article, you will learn how to use this method to identify the duplicate rows in a DataFrame. You will also get to know a few practical tips …

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Creating pandas series from dictionary

Leave a Comment / Pandas / By MachineLearningPlus

Pandas Series is a 1-dimensional array like object which can hold data of any type. You can create a pandas series from a dictionary by passing the dictionary to the command: pandas.Series(). In this article, you will learn about the different methods of configuring the pandas.Series() command to make a pandas series from a dictionary …

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Pandas Head – How to get the first few rows?

Leave a Comment / Pandas / By MachineLearningPlus

pandas.head() function is used to access the first n rows of a dataframe or series. It returns a smaller version of the caller object with the first few entries.

RegEx Replace values using Pandas

Leave a Comment / Pandas / By MachineLearningPlus

RegEx (Regular Expression) is a special sequence of characters used to form a search pattern using a specialized syntax While working on data manipulation, especially textual data, you need to manipulate specific string patterns. These may include retrieving hashtags from a tweet, extracting dates from a text, or removing website links. Pandas replace() function is …

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Pandas Histogram

Leave a Comment / Pandas / By MachineLearningPlus

Let’s understand how to create histogram in pandas and how it is useful. Histograms are very useful in statistical analysis. Histograms are generally used to represent the frequency distribution for a numeric array, split into small equal-sized bins. As we used pandas to work with tabular data, it’s important to know how to work with …

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Pandas Line Plot | Python

Leave a Comment / Pandas / By MachineLearningPlus

Pandas provides you a quick and easy way to visualize the relationship between the features of a dataframe. The Pandas line plot represents information as a series of data points connected with a straight line. Very often, we use this to find out how a particular feature changes with respect to time and also with …

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Pandas DateTime

Leave a Comment / Pandas / By MachineLearningPlus

Let’s understand how to work with Date-Time values in Pandas. While working with real time data, we often come across date or time values. The raw data itself might be represented as a string of text, but you will want to convert it to a datetime format in order to work with it. These are …

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Python

Decorators in Python – How to enhance functions without changing the code?

Generators in Python – How to lazily return values only when needed and save memory?

Iterators in Python – What are Iterators and Iterables?

Python Module – What are modules and packages in python?

Object Oriented Programming (OOPS) in Python

How to use Numpy Random Function in Python

Simulated Annealing Algorithm Explained from Scratch (Python)

Partial Correlation

Chi-Square test – How to test statistical significance for categorical data?

Numpy Reshape – How to reshape arrays and what does -1 mean?

Pandas Sample – Randomly Sample Rows From Dataframe

Pandas Iterate Over Rows

Pandas Describe

Pandas Dataframe.duplicated()

Creating pandas series from dictionary

Pandas Head – How to get the first few rows?

RegEx Replace values using Pandas

Pandas Histogram

Pandas Line Plot | Python

Pandas DateTime

Machine Learning A-Z™: Hands-On Python & R In Data Science

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