Raymond Raymond

Pandas DataFrame Plot - Pie Chart

event 2020-04-04 visibility 45,228 comment 0 insights toc
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Pandas DataFrame Plot - Pie Chart

This article provides examples about plotting pie chart using pandas.DataFrame.plot function.

Prerequisites

The data I'm going to use is the same as the other article Pandas DataFrame Plot - Bar Chart. I'm also using Jupyter Notebook to plot them.

The DataFrame has 9 records:

DATE

TYPE

SALES

0

2020-01-01

TypeA

1

2020-01-01

TypeB

2

2020-01-01

TypeC

3

2020-02-01

TypeA

4

2020-02-01

TypeB

5

2020-02-01

TypeC

6

2020-03-01

TypeA

7

2020-03-01

TypeB

8

2020-03-01

TypeC

Pie chart

df.groupby(['TYPE']).sum().plot(kind='pie', y='SALES')

The above code outputs the following chart:

2020040432416-image.png

Shadow effect

df.groupby(['TYPE']).sum().plot(kind='pie', y='SALES', shadow = True)

2020040432459-image.png

Start angle

df.groupby(['TYPE']).sum().plot(kind='pie', y='SALES', shadow = True, startangle=90)

2020040432624-image.png

Subplots (trellis)

We can also easily implement subplots/trellis charts.

Let's add derive one more column on the existing DataFrame using the following code:

df['COUNT'] = df['SALES'] /100
df

The dataframe now looks like this:


DATE

TYPE

SALES

COUNT

0

2020-01-01

TypeA

1000

10.0

1

2020-01-01

TypeB

200

2.0

2

2020-01-01

TypeC

300

3.0

3

2020-02-01

TypeA

700

7.0

4

2020-02-01

TypeB

400

4.0

5

2020-02-01

TypeC

500

5.0

6

2020-03-01

TypeA

300

3.0

7

2020-03-01

TypeB

900

9.0

8

2020-03-01

TypeC

100

1.0

Now we can plot the charts using the following code:

df.groupby(['TYPE']).sum().plot(kind='pie', subplots=True, shadow = True,startangle=90,figsize=(15,10))

In the above code, subplots=True parameter is used to plot charts on both SALES and COUNT metrics. The chart size is also increased using figsize parameter.

The chart now looks like the following screenshot:

2020040433450-image.png

Add percentage

df.groupby(['TYPE']).sum().plot(kind='pie', subplots=True, shadow = True,startangle=90,
figsize=(15,10), autopct='%1.1f%%')

2020040433818-image.png

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