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Reputation: 41

plt.show() doesn't render the image on jupyter notebook

When I'm trying to plot some data on jupyter notebook with pyspark environment (on python3.6) builded over EMR instance, the plot doesn't appears. Summarizing: When I run the plt.show() command the plot don't appear.

First I tried putting %matplotlib inline at the beginning but the plot appears. Then I tried changing the backend... No luck! Only the "Agg" backend works, when I tried others the code crush.

This is the same code I'm trying to plot:

import matplotlib.pyplot as plt
plt.switch_backend('agg')
plt.plot([1,2,3,4])
plt.show()

Output

Nothing...

I also read that for plotting I need to use "%matplotlib inline" but the problem with this is that the variables defined on others cells don't exist on %matplotlib inline cell.

Let's see...

Cell 1

dummy_var = 10

Cell 2

import matplotlib.pyplot as plt
plt.plot([1,2,3,4])
plt.show()
print(dummy_var)

Output

NameError: name 'dummy_var' is not defined.

Disclaimer: Being fair, the %matplotlib inline command works fine but I also need the outside variables, for plotting them.

Cell 3

%matplotlib inline
import matplotlib.pyplot as plt
plt.plot([1,2,3,4])
plt.show()

Output

[The plot]

This is my notebook, with the error and the examples... Image with the error

Upvotes: 4

Views: 9396

Answers (2)

Greg Treleaven
Greg Treleaven

Reputation: 51

I was able to display a plot using data from spark by running the following in a separate cell:

%matplot plt

That is courtesy of the README sample in the sparkmagic github page

Upvotes: 5

moctarjallo
moctarjallo

Reputation: 1625

This used to happen to me too, but what i used is this instructions:

%matplotlib inline

just in the cell you did make your imports

Also a good behavior to have with notebooks is to always put your imports in the same cell at the top of the notebook.

Upvotes: 1

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