# Matplotlib Pie Chart Size

Pie charts¶ The pie() command uses a MATLAB compatible syntax to produce pie charts. The parameter c represents the color of the point, s represents the size of the point, and alpha represents the transparency. By default, the layout engine will try to arrange the data labels so they do not overlap. And much more!. The point of a pie chart is to show the relationship of parts out of a whole. This function wraps matplotlib. Unfortunately, the Reportlab guide doesn't really explain how to use their charts, what … Continue reading Reportlab - How to Add Charts / Graphs →. As per [1] Just like a pie chart, a doughnut chart shows the relationship of parts to a whole, but a doughnut chart can contain more than one data. Matplotlib tries to make easy things easy and hard things possible. The goal of this blog post is a compilation of little tidbits and code snippets that address common issues when programming for data analysis in Python. np is specified as a reference to the numpy module and plt is specified as a reference to the matplotlib. Examples of charts are bar charts, pie charts, and line charts. This describes a simple way to create dynamic bitmap charts in Django. Waffle charts display values in congregated squares and are an alternative to pie charts. If you are showing percentages, all of them should add to 100%. Due to the somewhat primitive method used to draw sectors, a sector that extends beyond both pi/2 and 3*pi/2 radians in either direction may not display properly. Complete Course on Data Visualization, Matplotlib and Python Udemy Free download. We go over many cool features of Matplotlib that we can use for data visualization. Here are some hints on how to create a graph. By default, pie charts begin with the left edge of the first slice pointing straight up. In this section we will discuss how to draw a pie chart. Note that the column that represents 7 units in the waterfall chart is the same height as the column that represents 47 units in the column chart. Matplotlib is a Python package for creating visualizations in order to get the most value out of your data. The problem I am having is that the text labels get pushed out side the matplotlib › matplotlib - users. However, it only changes the font-size of the percentage labels inside pie, and the labels outside remain un-affected. Pie object is a circular statistical chart, which is divided into sectors to illustrate numerical proportion. pie() method is a list of pie piece sizes. Take a close look at the attached code, which generates this figure in just a few lines of code. 用于添加注解， 增加text很简单，坐标x，y，内容. (Though you can use a stacked bar chart to make a Gantt chart. Creating custom visualizations with Matplotlib on real-world data can be tricky, sometimes with a lot of different features and complex code. Select the chart, and right click anywhere within the chart. Now select the pivot table data and create your pie chart as usual. Changing the fonts for the labels on each axis (the numbers) is a little bit more complicated, but you can use it in combination with the content above to specify fonts for every part of your graph. This python Pie chart tutorial also includes the steps to create pie chart with percentage values, pie chart with labels and legends. Pie charts can be drawn using the function pie() in the pyplot module. via MatPlotLib). The total sales in the year have to have occurred in one quarter or another. How to make a pie chart (ice cream) We will need to import pyplot to make pie charts: import matplotlib. Quoting Wikipedia: A ring chart, also known as a sunburst chart or a multilevel pie chart, is used to visualize hierarchical data, depicted by concentric circles. In this tutorial, we will plot a pie chart using Matplotlib. Graph Plotting in Python | Set 3 This article is contributed by Nikhil Kumar. They are extracted from open source Python projects. I've attached a jpg of the chart - here is my source. This is usually inferred from the dtype of the input variables, but can be used to specify when the "categorical" variable is a numeric or when plotting wide-form data. hist() are: density= histtype= facecolor= alpha=(opacity). Thus, we have five classes for classification: horizontal bar. It is possible to define chart colors for most types of XlsxWriter charts via the add_series() method. An Emma chart (or a circle chart) is a circular statistical graphic which is divided into slices to illustrate numerical proportion. Therefore, an axes to which a pie chart is plotted will be set to have equal aspect ratio by default. Unlike other charting libraries that only allow creation of static images with low resolution, our charts are completely interactive and responsive on all screen sizes. A pie chart (or circle chart) is a circular graphic whose total area represents 100%. Are there any smart. 6 — Plotly Bar Chart Example. Both bar and pie charts work best for distributions of variables that can take only a fixed number of values, such as low/normal/high, yes/no, or regular/electric/hybrid. slices of pie. the length of its radius). This R tutorial describes how to create a pie chart for data visualization using R software and ggplot2 package. resulting in an illegible pie-chart. This post describes how to rotate a chart in Excel 2016-2010. This is similar to how we are used to interpreting pie charts, where area is the quantity of interest. pie() to place the first edge at three o'clock, and it would be great to be able to customize this. python-pptx¶. Geometric operations are performed by shapely. Matplotlib supports pie charts using the pie() function. This could be a date field (x-axis), a cost figure (y-axis), and the ROI of the project (bubble size). fig_size = plt. There are quite a few kinds of visual charts, and I'll introduce the common ones in the article. At least one sub plot must be. This gist is written so that the important bits for each section are quickly and easily visible. Note that the numpy and matplotlib modules must be imported from within the scripts via the import command. Bar Charts. Pie Chart A pie graph/pie chart is a specialized graph used in statistics. rotate To gain a different view of a pie chart, you can ____ the chart within the 360 degrees of the circle. key – Keyword used to extract data from the timer. Recognize types of visualization: histograms, pie charts, and box and whisker plots. Pie charts require too much space to present too little information. When it comes to creating pie charts in R and ggplot2 you need to start with a bar graph from geom_bar() after the initial ggplot() function. based on the demand of the problem at hand. I've attached a jpg of the chart - here is my source. A typical use would be generating a customized PowerPoint presentation from database content, downloadable by clicking a link in a web application. ExcelR is the Best Data Analytics Training Institute in Pune with Placement assistance and offers a blended model of training. import matplotlib as mpl import matplotlib. 1: Date: January 06, 2011: Introduction; Installing. Specifying values for the keyword arguments customizes the histogram. Preliminaries % matplotlib inline import pandas as pd import matplotlib. Thanks to Manuel Metz for the example. Optional keyword arguments include a list of pie piece labels ( label= ) and if the percentages will be auto-calculated and in what format ( autopct= ). Information from its description page there is shown below. This matplotlib tutorial shows how to plot pie chart. Images The matlab interface has two functions for displaying image data: ﬁgimage, which will. [source code, hires. It is basically used to show the percentage or proportional data where each slice of pie represents a category. So let’s a look on matplotlib. Creating custom visualizations with Matplotlib on real-world data can be tricky, sometimes with a lot of different features and complex code. Our advanced charts offer a dynamic features like click & drag interaction, event indicators, and right-click interactivity. Pie charts can only take a single series of data. If you want the heights of the bars to represent values in the data, use geom_col() instead. GeoPandas extends the datatypes used by pandas to allow spatial operations on geometric types. Master Matplotlib Anatomy and Learn Seaborn to Visualize Data with Custom, Beautiful Charts, Suitable for All Purposes. data visualization, legend matplotlib, matplotlib, pie chart python, pyplot, python, scatterplot python 2 Responses to Matplotlib Pyplot Plt Python Pandas Data Visualization Plotting Norma91 says:. Matplotlib Using matplotlib we can plot different scatter plots, line graphs, bar graphs, pie chart and histograms. Unfortunately, the Reportlab guide doesn't really explain how to use their charts, what … Continue reading Reportlab - How to Add Charts / Graphs →. How to make Pie Charts. from matplotlib. resulting in an illegible pie-chart. Posted by Cited from How to set the labels size on a pie chart in python import matplotlib as mpl. Returns: matplotlib figure. You can now view memory usage(USS, PSS and RSS) in form of a pie by using smem as follows: $smem --pie name -s uss. The graph can be loaded as a bitmap or scanned directly from hardcopy from within the program. normal(mu, sigma, size=100) Build a histogram of the array x using Matplotlib's plt. It is possible to define chart colors for most types of XlsxWriter charts via the add_series() method. Having to show the numbers is another example of why Pie Charts are an awful form of data visualisation. First, you'll explore basic visualizations such as bar and pie charts. Making nicer looking pie charts with matplotlib March 27, 2013 by Valentine Svensson Firstly, one should in general stay away from pie charts, showing an area when the data relates to the arc lengths is confusing. Some of the options that can be used with some of the individual graph types won't work very well. A Mekko chart with %-axis (sometimes also called marimekko chart or 100% cost curve) is a two-dimensional 100% chart. js wherever you want. - Import dataset - Draw pie charts - Customize pie charts Learn to create pie charts with Matplotlib 3. patches as mpatches # needed for waffle Charts mpl. pie() method. Thus, we have five classes for classification: horizontal bar. gca (projection = '3d') # Make data. Below we create a pie chart. Pie chart The pie chart is best when you are aiming to display proportional data, and/or percentages. Pie charts show the size of items (called wedge) in one data series, proportional to the sum of the items. 0) These lists are automatically generated, and may be incomplete or contain duplicates. A pie chart is a circular graph which splits data into slices to show numerical proportion of each category. So I've been fooling around with the pyplot pie() function and it works well and all except for when I try to use mathtext in the wedge labeling (as in the autopct labeling, where I'd like the number, a \pm (+-) sign and some relevant number). Matplotlib Exercises, Practice and Solution: Write a Python programming to create a pie chart with a title of the popularity of programming Languages. This R tutorial describes how to create a pie chart for data visualization using R software and ggplot2 package. pyplot as plt fig = plt. The source code for each of the example images on this page can be accessed by clicking the image to go to the image description page. The pie chart created with above sample data will look like the following: In above sections, we looked at various graphical components we can construct with Matplotlib library to represent our data in various forms and establish differences in an intuitive manner while being statistical. These objects are called graphics or graphs , and they can be composed of a limited set of elements, using a limited set of rules (if you are interested in the conceptual foundations, read. In this article, we show how to create a pie chart in matplotlib with Python. So I've been fooling around with the pyplot pie() function and it works well and all except for when I try to use mathtext in the wedge labeling (as in the autopct labeling, where I'd like the number, a \pm (+-) sign and some relevant number). If no column reference is passed and subplots=True a pie plot is drawn for each numerical column independently. Let's see how to plot Scatter, Bubble, Pie, 3D Pie Chart on an excel sheet using openpyxl. A legend is a very useful thing if you have multiple plots on a single graph. Matplotlib is capable of creating all manner of charts, graphs, plots, histograms, and much more. Matplotlib supports pie charts using the pie() function. Some keyword arguments we can use with plt. So the layout of the subplots is the following 3 rows; 2 columns. if the plot size varies from to screen size to screen size it looks different. By now you’ve likely caught on to how we are formatting and calling the parameters within Matplotlib and Plotly to build our visualizations. Creating Interactive Charts with Plotly and Python Python allows you to go beyond static visualisations with interactive graphics that allow you to present more information and get more engagement from your audience. Editing Legends and Legend Keys In Excel, legend keys are linked to the data in the plot area, so changing the color of a legend key will also change the color of the data in the plot area. I've attached a jpg of the chart - here is my source. Pie charts can be constructed with Matplotlib's ax. This blog specifies how to create pie chart with value labels, donut chart and nested pie chart, and how to adjust labels' size and position with matplotlib in Python. 18 (Installation)python-pptx is a Python library for creating and updating PowerPoint (. hist() are: density= histtype= facecolor= alpha=(opacity). The thing is if I have long labels the pieces of the pie chart become very small. This matplotlib tutorial shows how to plot pie chart. The scaling transforms aren't quite right -maybe a matplotlib hacker. Here, we'll explore how to create just line plots and histograms with matplotlib. - Jack Aidley May 12 '16 at 8:50. Pie charts show the size of items (called wedge) in one data series, proportional to the sum of the items. Learn data skills and best practices to achieve optimal data warehouse and database performance. if the plot size varies from to screen size to screen size it looks different. Download transparent Pie Chart PNG for free on PNGkey. Usually, the percentage represented by each category is provided next to the corresponding slice of the pie. Unfortunately, the Reportlab guide doesn't really explain how to use their charts, what … Continue reading Reportlab - How to Add Charts / Graphs →. The data points in the pie chart are displayed as a percentage of the whole pie. text(x, y, text) 例子，. The data points in a pie chart are shown as a percentage of the whole pie. Specifying values for the keyword arguments customizes the histogram. Scatter Symbol. It is a circular graphic which is divided into slices to illustrate numerical proportion. Open Live Script. Consider the matplotlib legend guide with some examples of other stuff you want to do with legends. Pie Charts¶ Pie charts plot data as slices of a circle with each slice representing the percentage of the whole. A little known fact is that they now support adding charts or graphs to your PDF. In Part 2, you take your Python knowledge and apply it to Matplotlib. You can vote up the examples you like or vote down the ones you don't like. Previously if you wanted that functionality, you would have to do all the drawing code yourself. Below we create a pie chart. To show labels of each pie slice, pass them as a list of strings to the labels parameter of the matplotlib. As a data analyst or a data scientist, you don’t want to get bogged down. Typically, a Pie Chart is used to show parts to the whole, and often a % share. Click your Line chart to start it. Matplotlib 2. 8 – Matplotlib pie charts Conclusion. INTRODUCTION. Pie Charts shows proportions and percentages between categories, by dividing a circle into proportional segments/parts. We can then remake our chart: Overall, matplotlib/pyplot pie charts are pretty easy. It provides a large library of various plots such as pie charts, line charts, bar charts, area plots, histograms, boxplots, scatter plots and polar plots to mention a few. The one required positional argument supplied to the ax. pyplot namespace:. Whatever you do, just don't use a pie chart. (optional) A list of labels for those slices; For example, if we wanted to chart ice cream preferences, you might have these two lists:. To draw a pie chart using matplotlib python library, use matplotlib. pie_charts_subplots_matplotlib. In a pie chart, the arc length of each slice (and consequently. One variable is chosen in the horizontal axis and another in the vertical axis. Here i am using the most popular matplotlib library. normal(size=n) y=data. By default, pie charts begin with the left edge of the first slice pointing straight up. Pie charts are typically used to show percentage or proportional data. However, it only changes the font-size of the percentage labels inside pie, and the labels outside remain un-affected. In the regular 100% chart, since the columns are scaled to relative heights, there is no visual representation. Traditionally, matplotlib. js is a JavaScript library for manipulating documents based on data. The following example shows two charts which have the same size, but not the same scale. You can control the defaults of almost every property in matplotlib: figure size and dpi, line width, color and style, axes, axis and grid properties, text and font properties and so on. In this course, , you'll learn the foundations of Matplotlib to reveal the story behind the data. Having to show the numbers is another example of why Pie Charts are an awful form of data visualisation. First, you’ll explore basic visualizations such as bar and pie charts. The placement of the bubble on the x-axis and y-axis give you information about what the bubble represents. To create a pyplot pie chart, you'll need two lists: (required) A list of numbers indicating the size of each pie slice. This python Pie chart tutorial also includes the steps to create pie chart with percentage values, pie chart with labels and legends. Hi all, I'm trying to generate a pie chart to use in my django web app. Making nicer looking pie charts with matplotlib March 27, 2013 by Valentine Svensson Firstly, one should in general stay away from pie charts, showing an area when the data relates to the arc lengths is confusing. python matplotlib pie-chart. Therefore, an axes to which a pie chart is plotted will be set to have equal aspect ratio by default. Let's draw a simple pie chart of the goals scored by a football team from free kicks, penalties and field goals. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more. Make the line red. And if you want to show change over time, a line graph will be best. How to create heatmap calendar using Numpy and Matplotlib? Turn on the axes of the pie chart in Python Matplotlib; Create legend with bubble size using Numpy and Matplotlib; Vary the color of each bar in bar chart using particular value in Matplotlib; Combine two Heat Maps in Matplotlib; Plotting all available markers at random coordinates in. A pie type is a circular chart where different categories are marked as part of the circle. Recommend：How to plot a pie chart with the first wedge on top, in Python [matplotlib] on the top of the pie) The default is for pyplot. pie() function. Seaborn Stacked Histogram. I've managed to animate a scatter graph, but I think my data would be better represented by a pie chart. Coordinate-based chart types (column, bar, area, point, line, and range) have two axes that are used to categorize and display data relationships. here's a variation of jepler's tkinter example, using aggdraw to do the drawing and PIL to generate the image. On the Chart tab, click Interpolated, and then click OK. How to change size of Matplotlib plot Ashwin Uncategorized 2014-10-27 2015-11-24 1 Minute Sometimes you may want to change the width or height or both of the plot figure generated by Matplotlib. Unfortunately, the Reportlab guide doesn't really explain how to use their charts, what … Continue reading Reportlab - How to Add Charts / Graphs →. python matplotlib pie-chart this question edited Mar 13 '12 at 15:41 casp. By default, the categorical axis line is suppressed. Pie charts can be constructed with Matplotlib's ax. pie([2, 3, 10, 20]) Scatterplot. Similar to matplotlib line plots, bar plots and pie charts, a set of keyword arguments can be included in the plt. The independent variable is plotted around a circle. (optional) A list of labels for those slices; For example, if we wanted to chart ice cream preferences, you might have these two lists:. The sector labels are set in labels. It is basically used to show the percentage or proportional data where each slice of pie represents a category. if the plot size varies from to screen size to screen size it looks different. However, it only changes the font-size of the percentage labels inside pie, and the labels outside remain un-affected. In all other cases, do not use a pie chart. Specifying values for the keyword arguments customizes the histogram. Only difference is that the area between the x -axis and the line is filled with color. from matplotlib. Preliminaries % matplotlib inline import pandas as pd import matplotlib. Only when two charts share the same scale, are the physical sizes of their bars or columns comparable. Matplotlib The most used plotting API in Python is Matplotlib. Become a data visualizations expert with Python and Matplotlib 3 by learning effective data visualization recipes. Figure: Pie chart In this tutorial, we have created scatter, line, bar, and pie charts with Matplotlib library. They are extracted from open source Python projects. Add Legend to Pie Chart. Include the percentage contributed by each energy title on the pie chart. Typically, a Pie Chart is used to show parts to the whole, and often a % share. GeoPandas extends the datatypes used by pandas to allow spatial operations on geometric types. Typically, you want some additions to the simple pie chart: 1. RandomState(10) n=5000 n2=1000 x=data. See more examples. For a brief introduction to the ideas behind the library, you can read the introductory notes. Data visualized by the sectors of the pie is set in values. In the following example, we have taken four sectors. How to set the direction of pie chart in Python Matplotlib? Clockwise vs anti-clockwise pie charts: To specify fractions direction of the pie chart, you must set the counterclock parameter to True or False (value is True by default). You can now view memory usage(USS, PSS and RSS) in form of a pie by using smem as follows:$ smem --pie name -s uss. Pie chart is a classic way to show the composition of groups. Data scientists are no less than. It is also used for setting all chart properties apart from the secondary data series. The following are code examples for showing how to use matplotlib. The data points in the pie chart are displayed as a percentage of the whole pie. matplotlib – A Portable Python Plotting Package log plots, pie charts and bar charts. A Mekko chart with %-axis (sometimes also called marimekko chart or 100% cost curve) is a two-dimensional 100% chart. In this tutorial, we will plot a pie chart using Matplotlib. If no column reference is passed and subplots=True a pie plot is drawn for each numerical column independently. The graphic will be drawn as follows: For more details about the scatter function, please see here: matplotlib. ) Now, let’s take a look at how to make a bar chart in Excel. In this tutorial will cover some of the known charts types like the Scatter Chart, line chart, Parabola chart, Bar chart, Pie chart, Treemap, and others. Matplotlib - bar,scatter and histogram plots Simple bar plot¶ import numpy as np import matplotlib. In this tutorial, 'Sample-Superstore. A sequence of matplotlib color args through which the pie chart will cycle. Is it possible to show this classification in the legend of QGIS 3? qgis-3 legend diagram. How to set the direction of pie chart in Python Matplotlib? Clockwise vs anti-clockwise pie charts: To specify fractions direction of the pie chart, you must set the counterclock parameter to True or False (value is True by default). Best Of 32 Sample Pie Chart Maker with Pictures. Editing Legends and Legend Keys In Excel, legend keys are linked to the data in the plot area, so changing the color of a legend key will also change the color of the data in the plot area. Only when two charts share the same scale, are the physical sizes of their bars or columns comparable. In this tutorial, 'Sample-Superstore. You can now view memory usage(USS, PSS and RSS) in form of a pie by using smem as follows: $smem --pie name -s uss. Pie charts require too much space to present too little information. Since the pie chart represents the size relationship between the parts and the entire entity, the parts need to sum to a meaningful whole. pyplot is used for 2D graphics. hist() function. Also, the library provides features to style the pie plots. Unfortunately, the Reportlab guide doesn't really explain how to use their charts, what … Continue reading Reportlab - How to Add Charts / Graphs →. r,pie-chart The following code modified from an earlier post produces a plot window containing a pie-chart. * Translate polygons and pie charts with the geographic coordinate system. matplotlib, just like numpy, is one of those libraries which has so much legacy behind the import statement that it’s worth breaking Python style rules and using the at keyword to change the name of the imported library. Note that another option would be to use the radius and width arguments (see graph #163). It is possible to define chart colors for most types of XlsxWriter charts via the add_series() method. Method of making donut graph from pie chart in MatPlotLib documentation is complicated rather we can just change pie chart to donut chart by drawing a circle with white color at origin. * Limit main axes limits to specific areas (zoom to areas). Matplotlib is a Python package for creating visualizations in order to get the most value out of your data. Pie charts are also used heavily in survey results, news articles, resource usage diagrams like disk and memory. Create online graphs and charts. bar function, however, takes a list of positions and values, the labels for x are then provided by plt. Pie charts can make the size of portions easy to understand at. Waffle Chart of Total Spending. Surface Analysis Chart Legend , Pie Charts In Power View Excel, Maxent Estimation Of Aquatic Escherichia Coli Stream Impairment [peerj], Weather Prediction Center Wpc Home Page, Parative Genomics and Genotype Phenotype associations In. Creating a histogram plot with python — posted 2011-12-08; How to draw a simple line using python and the matplotlib API - — posted 2007-01-05 How to use the pylab API vs. It is basically used to show the percentage or proportional data where each slice of pie represents a category. This function wraps matplotlib. There are different kinds of plots available with Matplotlib library like histograms, pie charts, scatter plots, line charts for time series, bar charts, box plots, violin plots, heatmap, pair plot etc. Images The matlab interface has two functions for displaying image data: ﬁgimage, which will. Notice we setup a 1 row grid and placed two subplots within that grid. In this tutorial, we will plot a pie chart using Matplotlib. The below python code example draws a pie chart using the pie() function. geom_bar() makes the height of the bar proportional to the number of cases in each group (or if the weight aesthetic is supplied, the sum of the weights). pyplot namespace:. pyplot as plt. Multiple pie charts using matplotlib. Let’s use the dataset we used in the previous example to reproduce the graphics based on area, instead of radius: I hypothesise that readers have less chance of being misled at first glance of this graphic. This page is dedicated to general ggplot2 tips that you can apply to any chart, like customizing a title, adding annotation, or using faceting. I need to create two pie charts, but they should share a single legend. How to create heatmap calendar using Numpy and Matplotlib? Turn on the axes of the pie chart in Python Matplotlib; Create legend with bubble size using Numpy and Matplotlib; Vary the color of each bar in bar chart using particular value in Matplotlib; Combine two Heat Maps in Matplotlib; Plotting all available markers at random coordinates in. It is a circular graphic which is divided into slices to illustrate numerical proportion. 2 (12 ratings) Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course. Matplotlib Pie Plot The behavior of Pie Plots are similar to that of Bar Graphs, except that the categorical values are represented in proportion to the sector areas and angles. Creating Interactive Charts with Plotly and Python Python allows you to go beyond static visualisations with interactive graphics that allow you to present more information and get more engagement from your audience. While we could import matplotlib and make function calls directly to plot data, many Pandas methods for Series and DataFrame objects make this easier. By default, the layout engine will try to arrange the data labels so they do not overlap. Matplotlib can be used in.$ sudo apt-get install python-matplotlib. Bar and pie charts are easy to create with Python. Let's begin by trying to make a pie chart from a Pandas Series. Some keyword arguments we can use with plt. Add Legend to Pie Chart. Pie charts show the size of items (called wedge) in one data series, proportional to the sum of the items. Graph Plotting in Python | Set 3 This article is contributed by Nikhil Kumar. the matplotlib API — posted 2007-01-04. Matplotlib can be used in. A good data visualization can turn data into a compelling story, which interpret the numbers into understandable figures. based on the demand of the problem at hand. Pie charts are a lot like the stack plots, only they are for a certain point in time. hist() are: density= histtype= facecolor= alpha=(opacity). In most cases, matplotlib will simply output the chart to your viewport when the. pie() function only requires one positional argument, a list or array of sizes. # So we can create a function for it:. When to Use the Pie Chart Type. As per [1] Just like a pie chart, a doughnut chart shows the relationship of parts to a whole, but a doughnut chart can contain more than one data. Related posts. Matplotlib Using matplotlib we can plot different scatter plots, line graphs, bar graphs, pie chart and histograms. But it keeps rendering in a rectanuglar canvas instead of a square one, so the pie is oblong instead of circular. Pie charts display the size of items in a data series, proportional to sum of its items.