SSCE for StackOverflow https://stackoverflow.com/questions/53163438/permissionerror-errno-13-permission-denied-when-saving-holomap-to-gif

ssce.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import matplotlib
matplotlib.use('agg') # avoid use of tkinter (not preinstalled on Linux)
# GIF support requires ImageMagick which is installed by default on many Linux installations
import holoviews as hv
hv.extension('matplotlib')

# create a series of 5 x 5 heatmaps
numHeatMaps = 2
measurements = [[(i + 1, j + 1, k * 100 + i * 10 + j) for i in range(5) for j in range(5)] for k in range(numHeatMaps)]
heatMapDict = {k:hv.HeatMap(measurements[k]) for k in range(len(measurements))}
holo = hv.HoloMap(heatMapDict, kdims='index')

# render the heatmaps as an animated GIF
renderer = hv.renderer('matplotlib')
renderer.fps = 5
renderer.save(holo, 'holo', fmt='gif') # broken in Python 3.7 under Windows 10 for any value of numHeatMaps