Plotting live pie-chart using matplotlib pyplot

Question

Code:

import matplotlib.pyplot as plt
from time import sleep
for i in range(100):
    plt.pie([100-i,i])
    sleep(1)
    plt.show()

Problem with my code:

Whenever the values of plt.pie() changes and the pie chart are plotted then execution of for loop seems to be halted and I have to close the pie chart window to resume to the execution of for loop.

What I want to do:

plt.pie() display live changes in its values without halting for loop's execution.

thank you.

Please have a look at matplotlib animations, which are especially created to be able to run code inside the event loop and to hence avoid such problems. — ImportanceOfBeingErnest
– ImportanceOfBeingErnest, Commented Oct 12, 2018 at 16:24

onno · Accepted Answer · 2018-10-12 13:39:44Z

1

add plt.close() to your for-loop

import matplotlib.pyplot as plt
from time import sleep
for i in range(100):
    plt.pie([100-i,i])
    sleep(1)
    plt.show()
    plt.close()

answered Oct 12, 2018 at 13:39

onno

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3 Comments

This is not working. plt.show() seems to be blocking the execution of plt.close() function too.

what if you remove plt.show() and add plt.figure() as the first line in your for loop?

I used plt.draw() with plt.pause() and it is working now. plt.draw() is a non-blocking function so it does not halts the execution of the loop.

Ketan Ramteke · Accepted Answer · 2020-11-18 18:22:13Z

0

Fixed it.

import matplotlib.pyplot as plt
from time import sleep
for i in range(100):
   plt.pie([100-i, i])
   plt.pause(.001)
   plt.draw()
   sleep(1)

plt.show() is blocking function so instead used plt.draw() along with plt.pause() and now it's working as intended.

answered Nov 18, 2020 at 18:22

Ketan Ramteke

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