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Pie plot using Plotly in Python

  • Last Updated : 28 Jun, 2021

Plotly is a Python library which is used to design graphs, especially interactive graphs. It can plot various graphs and charts like histogram, barplot, boxplot, spreadplot and many more. It is mainly used in data analysis as well as financial analysis. plotly is an interactive visualization library. 

Pie Plot

A pie chart is a circular analytical chart, which is divided into region to symbolize numerical percentage. In px.pie, data anticipated by the sectors of the pie to set the values. All  sector  are classify in names. Pie chart is used usually to show the percentage with next corresponding slice of pie. Pie chart helps to make understand well because of its different portions and color codings.

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Syntax: plotly.express.pie(data_frame=None, names=None, values=None, color=None, color_discrete_sequence=None, color_discrete_map={}, hover_name=None, hover_data=None, custom_data=None, labels={}, title=None, template=None, width=None, height=None, opacity=None, hole=None)



Parameters:

Name  Value Description
data_frame DataFrame or array-like or dict This argument needs to be passed for column names (and not keyword names) to be used. Array-like and dict are transformed internally to a pandas DataFrame. Optional: if missing, a DataFrame gets constructed under the hood using the other arguments
names str or int or Series or array-like  Either a name of a column in data_frame, or a pandas Series or array_like object. Values from this column or array_like are used as labels for sectors.
values str or int or Series or array-like  Either a name of a column in data_frame, or a pandas Series or array_like object. Values from this column or array_like are used to set values associated to sectors.
color str or int or Series or array-like  Either a name of a column in data_frame, or a pandas Series or array_like object. Values from this column or array_like are used to assign color to marks.

Example:

Python3




import plotly.express as px
import numpy
 
# Random Data
random_x = [100, 2000, 550]
names = ['A', 'B', 'C']
 
fig = px.pie(values=random_x, names=names)
fig.show()


 

 

Output:

 



Grouping Data

 

The same value for the names parameter are grouped together. Repeated labels visually groups rows or columns together to make the data easier to understand. Let’s see one example given below.

 

Example: The iris dataset contains many rows but only 3 species so the data is grouped according to the species.

 

Python3




import plotly.express as px
 
# Loading the iris dataset
df = px.data.iris()
 
fig = px.pie(df, values="sepal_width", names="species")
fig.show()


 

 

Output: 

 



Customizing pie chart

 

The pie chart can be customized by using the px.pie, using some of its parameters such as hover_data and labels. Let’s see the below example for better understanding.

 

Example:

 

Python3




import plotly.express as px
 
# Loading the iris dataset
df = px.data.iris()
 
fig = px.pie(df, values="sepal_width", names="species",
             title='Iris Dataset', hover_data=['sepal_length'])
fig.show()


 

 

Output:



 

Setting Colors

 

The color of pie can be change in plotly module. Different colors help in to distinguish the data from each other, which help  to understand the data more efficiently.

 

Example:

 

Python3




import plotly.express as px
 
# Loading the iris dataset
df = px.data.iris()
 
fig = px.pie(df, values="sepal_width",
             names="species",
             color_discrete_sequence=px.colors.sequential.RdBu)
fig.show()


 

 

Output:

 

 




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