Issues with matplotlib attribute errors

Question

import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np

df = pd.read_csv('Iris.csv')

plot = plt.scatter(df['SepalLengthCm'], df['PetalLengthCm'])
plot.savefig('ScatterIris.png')

I'm trying to do some really basic matplotlib stuff and it keeps raising errors.

C:\Users\Robert\Anaconda3\python.exe 
C:/Users/Robert/PycharmProjects/linear_regression/ML.py
Traceback (most recent call last):
  File "C:/Users/Robert/PycharmProjects/linear_regression/ML.py", line 9, in <module>
plot.savefig('ScatterIris.png')
AttributeError: 'PathCollection' object has no attribute 'savefig'

First I couldn't use the .show() attribute and then I couldn't use the .savefig() attribute. Is there something wrong with my matplotlib installation?

For reference I tried changing the backend of my matplotib in matplotlibrc to a couple different ones and the same error everytime.

Edit @ nbryans

plt.scatter(df['SepalLengthCm'], df['PetalLengthCm']).savefig('ScatterIris.png')

Same error comes up

Edit 2:

Yeah you guys were right I can save figures and use the show() attribute/method. Thanks!

Your edit doesn't matter... You're still trying to call a method (savefig) that doesn't exist for PathCollection objects. — boot-scootin
– boot-scootin, Commented May 11, 2017 at 16:13
So you may choose any of the answers to accept (doesn't matter which one, they are all roughly the same), such that this question will not stay unsolved. — ImportanceOfBeingErnest
– ImportanceOfBeingErnest, Commented May 11, 2017 at 17:01

ImportanceOfBeingErnest · Accepted Answer · 2017-05-11 16:14:57Z

1

You need to call pyplot's savefig method.

import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np

df = pd.read_csv('Iris.csv')

plt.scatter(df['SepalLengthCm'], df['PetalLengthCm'])
plt.savefig('ScatterIris.png')

The same is true if you were using the pandas plotting function,

import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np

df = pd.read_csv('Iris.csv')
df.plot(kind="scatter", x='SepalLengthCm', y= 'PetalLengthCm')

plt.savefig('ScatterIris.png')

answered May 11, 2017 at 16:14

ImportanceOfBeingErnest

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Vinícius Figueiredo · Accepted Answer · 2017-05-11 16:13:05Z

0

You don't need to assign a plot variable and you should just do plt.show(). Try:

plt.scatter(df['SepalLengthCm'], df['PetalLengthCm'])

plt.savefig('ScatterIris.png') # or plt.show()

answered May 11, 2017 at 16:13

Vinícius Figueiredo

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nbryans · Accepted Answer · 2017-05-11 16:13:50Z

0

This is because savefig() is a function of pyplot (i.e.plt) and not of the recently createdplot`. It saves whatever the current plot you created is. Thus, it should be:

plt.savefig()

Similarly, just to see your plot, it would be

plt.show()

answered May 11, 2017 at 16:13

nbryans

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