  # Intro to Data Science Part 1: Numpy and Pandas by Tiffany Souterre

It is also capable of handling a vast amount of data and convenient with Matrix multiplication and data reshaping. Before Pandas, Python was capable for data preparation, but it only provided limited support for data analysis. So, Pandas came into the picture and enhanced the capabilities of data analysis. It can perform five significant steps required for processing and analysis of data irrespective of the origin of the data, i.e., load, manipulate, prepare, model, and analyze. When printing a Series, the data type of its elements is also printed. To customize the indices of a Series object, use the index argument of the Series constructor.

Provided all the data within the lists is the same you can also create multi-dimensional NumPy arrays. Pandas Value_counts to Count Unique ValuesThe Pandas value_counts functioncounts values in a Pandas dataframe. Learn to normalize, include missing values, and combine with groupby.

## Pandas Features

Here we repeat and summarize the main methods we have discussed so far. First create three objects, a numpy https://www.globalcloudteam.com/ matrix, a data frame, and a series. The first two are 2-dimensional but the last one 1-dimensional.

• Now, we’ll take up a real-life data set and use our newly gained knowledge to explore it.
• We can create an array that follows specific data distributions.
• When used for numerical calculations, NumPy arrays use less memory than Python lists.
• We’ll work with the popular adult data set.The data set has been taken from UCI Machine Learning Repository.

However, as it is “made of” numpy, it works very well together with the latter. As the example demonstrates, random.choice picks random elements with replacement . Do the following using a single one-line vectorized operation. Logical indexing can also be used on the left-hand-side of the expression, in order to replace elements.

## Because ML systems are more fragile than you think. All based on our open-source core.

It’s a table having items of the same kind, such as numbers, strings, or characters , with integers being the most common. Travis Oliphant built the NumPy package in 2005 by combining the functionality of the progenitor module Numeric with the functionality of another module Numarray. It can also handle large amounts of data and is useful for Matrix multiplication and data reshaping. Pandas make use of a single core of CPU to perform operations. Libraries such as Dask, PySpark, PyPolars, cuDF, Modin, etc. take advantage of multi-cores of CPU and therefore, are faster than Pandas. We can create an array with user-defined values using the built-in syntax. The below code returns the first row and second row along with the second column and third column . This method returns the number of rows and columns in the DataFrame. NumPy arrays are stored at one continuous place in memory unlike lists, so processes can access and manipulate them very efficiently.

## How To Use .groupby() Effectively As A Data Scientist

As your exercise, you should use this model and make prediction on the test data we loaded initially. You can perform same set of steps we did on the train data to complete this exercise. In case you face any difficulty, feel free to share it in Comments below. #pandas library intrinsically assigns an encoding to categorical variables. Make sure you following each line below because it’ll help you in doing data manipulation using pandas. So, instead of typing each of their elements manually, you can use array concatenation to handle such tasks easily. Pandas is best at handling tabular data sets comprising different variable types (integer, float, double, etc.). In addition, the pandas library can also be used to perform even the most naive of tasks such as loading data or doing feature engineering on time series data. Pandas is a popular library when it comes to data analysis, data manipulation and visualizations. It is extensively used during the exploratory data analysis phase of a Data Science project. NumPy is usually preferred when we need to perform mathematical calculations. It has inbuilt functionalities which can handle matrix computations with ease.

## 3.4 Positional indexing of data frames

NumPy is mostly written in C language, and it is an extension module of Python. It is defined as a Python package used for performing the various numerical computations and processing of the multidimensional and single-dimensional array elements. The calculations using Numpy arrays are faster than the normal Python array. The list(zip()) function can be used to combine two lists. Now, call the pd.DataFrame() function to construct a pandas DataFrame. However, using the alias to import the library is not required; it only aids in writing less code each time a function or property is invoked. Blue River’s “See what is NumPy & Spray” technology identifies plants in farmers’ fields using computer vision and machine learning. This is very beneficial for weed detection among acres of crops. The See & Spray rig can also target specific plants and spray them with herbicide or fertilizer, as its name implies.

## Another Example to Convert

This also causes certain differences between the base python approach and the way to do vectorized operations. It is an open source module of Python which provides fast mathematical computation on arrays and matrices. But, Pandas’ performance is better than NumPy’s for 500K rows or more. Thus, performance varies between 50K and 500K rows depending on the type of operation. The Pandas provides some sets of powerful tools like DataFrame and Series that mainly used for analyzing the data, whereas in NumPy module offers a powerful object called Array. The NumPy package is created by the Travis Oliphant in 2005 by adding the functionalities of the ancestor module Numeric into another module Numarray. NumPy has been around for much longer than Pandas and has been developed by many experts. It is incredibly fast at performing mathematical operations on arrays or matrices of numbers, making it ideal for scientific computing tasks. It comes with many useful functions such as transpose, reshape, sum, dot products, etc., that make it easier to compute results.

## Introduction to Pandas and NumPy

It’s significantly more efficient and environmentally friendly than spraying a full field. We can change the shape of an array without altering the data present inside an array, by using np.reshape() function. NumPy can be used to create an array of 1s as well by using np.ones() function. NumPy is one of Python’s most essential libraries, and it’s also one of the most helpful. I can almost see your eyes glinting with excitement at the possibility of mastering NumPy. As data scientists or aspirant data scientists, we must have a strong understanding of NumPy and how it works in Python. See all posts