Rmarkdown Equivalent In Python

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You could use addition and broadcasting: x = np.array(1,2,3,4,5) constant = 3 x:,None + np.arange (constant) array(1, 2, 3, 2, 3, 4, 3, 4, 5, 4, 5, 6, 5, 6, 7) This could. The subprocess module enables you to start new applications from your Python program. This is equivalent to ‘cat test.py’. You might try the index method. Python is dynamically typed, therefore you might not need to convert anything.

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Introduction

One of the great things about the R world has been a collection of Rpackages called tidyverse that are easy for beginners to learn andprovide a consistent data manipulation and visualisation space. Thevalue of these tools has been so great that many of them have beenported to Python. That’s why we thought we should provide anintroduction to tidyverse for Python blog post.

What is tidyverse?

Tidyverse is an opinionated collection ofR packages designed for data science. All packages share an underlyingdesign philosophy, grammar, and data structures. The core R tidyversepackages are: ggplot2, dplyr, tidyr, readr, purrr, tibble, stringr andforcats.

Python implementation of dplyr

The tidyverse package dplyr is a grammarof data manipulation, providing a consistent set of verbs that help yousolve the most common data manipulation challenges. Here are some of thefunctions dplyr provides that are commonly used:

  • mutate() - adds new variables that are functions of existingvariables
  • select() - picks variables based on their names.
  • filter() - picks cases based on their values.
  • summarise() - reduces multiple values down to a single summary.
  • arrange() - changes the ordering of the rows.

Dplython is a Pythonimplementation of dplyr which can be installed using pip and thefollowing command:

pip install dplython

Instructions on how to use pip to install python packages can be foundhere.

The Dplython README providessome clear examples of how the package can be used. Below is an summaryof the common functions:

  • select() - used to get specific columns of the data-frame.
  • sift() - used to filter out rows based on the value of a variable inthat row.
  • sample_n() and sample_frac() - used to provide a random sample ofrows from the data-frame.
  • arrange() - used to sort results.
  • mutate() - used to create new columns based on existing columns.
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For more functions and example code visit the DplythonREADME page.

At the bottom of the README a comparison is provided topandas-ply which is anotherpython implementation of dplyr.

Dplython comes with a sample data-set called ‘diamonds’. Here are somebasic examples of how to use Dplython.

Import Python packages and the ‘diamonds’ data-frame:

Create a new data-frame by selecting columns of the ‘diamonds’data-frame:

Display the top 4 rows of the ‘diamondsSmall’ data-frame:

Filter the data-frame for rows where the price is higher than 18,000 andthe carat less than 1.2 and sort them by depth:

Provide a random sample of 5 rows from the data-frame

Rmarkdown Equivalent In Python

Add a column to the data-frame containing the rounded value of ‘carat’

Python implementation of ggplot2

The tidyverse package ggplot2 is asystem for declaratively creating graphics, based on The Grammar ofGraphics. You provide the data, tell ggplot2 how to map variables toaesthetics, what graphical primitives to use, and it takes care of thedetails.

A Python port of ggplot2 has long been requested and there are now a fewPython implementations of it; Plotnineis the one we will explore here. Plotting with a grammar is powerful, itmakes custom (and otherwise complex) plots easy to think about andcreate, while the plots remain simple.

Plotnine can be installed using pip:

pip install plotnine

Plotnine splits plotting into three distinct parts which are data,aesthetics and layers. The data step adds the data to the graph, theaesthetics (aes) step adds visual attributes and the layers step createsthe objects on a plot. Multiple aesthetics and layers functions can beadded to a Plotnine graph.

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If you are a python user used to Matplotlib it can take some gettingused to a Grammar of Graphics plotting tool which is partly due to thedifference in philosophy. Plotnine providessometutorials tohelp with getting to grips with the package and there is also thePlotnine README. However if youare new to Grammar of Graphics plotting then this highly recommendedkaggle notebook for Plotnine is probably thebest place to start.

Here are some examples of how to use plotnine to visualize data from the‘diamonds’ data-frame that comes with Dplython.

Import Python packages, the ‘diamonds’ data-frame and create a sampledata-frame:

Create a scatter plot of ‘carat’ vs ‘price’:

Add additional layers e.g. a line of best fit:

Add another aesthetic, here the data is coloured by the ‘cut’ variable:

Add a layer which separates the data into graphs based on ‘colour’

This article compares a variety of alternativeplotting packages for Python.

Next steps

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  • Read the documents that are linked in this blog post.
  • Learn the basics of Pandas.
  • Use Dplython and Plotnine to practice data manipulation &visualization. For example complete some of the exercises atkaggle.

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Do you know of other good Python implementations of tidyverse? If so letus know about them!