tkinter error on Heroku

[ltfschoen]

If deploy Visualisation.py to Heroku uncommented, then import seaborn, import matplotlib.pyplot as plt each cause error:
ImportError: No module named _tkinter.

Adding to Aptfile the following does not make any difference to error:

python-tk
python3-tk
tk8.6
tk8.6-dev
tcl8.6
tcl8.6-dev
tk
tk-dev
tkinter-pypy

Importing the following extras in Visualisation.py does not make any difference to the error:

import Tkinter as tk # Python 2
import tkinter as tk # Python 3
import matplotlib
matplotlib.use('Agg')

[andrey-berenda]

I have the same probrem, how can I use matplotlib in Heroku?

[rudrathegreat]

I have the same probrem, how can I use matplotlib in Heroku?

[rudrathegreat]

It works for me by doing this -

import matplotlib
matplotlib.use('Agg')

[qrq]

I have the same probrem, how can I use matplotlib in Heroku?

this solution not work :
import matplotlib
matplotlib.use('Agg')

[rudrathegreat]

link to my heroku website (Requirements in requirements.txt) - https://github.com/rudrathegreat/Water-Quality-Checking-System-Web-Application

In Data/views.py, the following lines have been used -

import matplotlib
matplotlib.use('Agg')

[qrq]

its work again by saving chart in sub directory :

fg='static/chart/'+str(share)[:-3]+'.png'
plt.savefig(fg, bbox_inches='tight')

[rudrathegreat]

cool