RuntimeError: main thread is not in main loop with Matplotlib and Flask

Question

I\'m using flask, matplotlib to save image and tensorflow to create a session. I\'m getting the above error when I run the following code. Does the flask route run on a separate

Answer 1

I was on the same situation, Flask with Matplotlib combo. What worked for me is to specify Agg as Matplotlib backend.

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

# Your code here

You can refer to Matplotlib documentation (Matplotlib in a web application server) for the details.

Answer 2

apparently this is an issue with TKinter. You don't have your full error message posted (you really should do that), but I'm working on something very similar so I'm 99.9% sure your problem is the same as mine. I'm building an app with tensorflow, flask, blah blah. I get the same error, intermittently (sometimes it works). Here are some links to similar questions. I hope this helps! I think my solution will be moving away from matplotlib.

• Threaded client with the same issue
• Running TKinter in a seperate thread
• enter link description here