Make matplotlib optional in show_viscube.py (#3065)

Jürgen Knödlseder
1 parent 6ed8241e
Showing 1 changed file with 7 additions and 1 deletions
examples/show_viscube.py
@@ -21,7 +21,13 @@
 import sys
 import gammalib
 import cscripts
-import matplotlib.pyplot as plt
+try:
+    import matplotlib.pyplot as plt
+    plt.figure()
+    plt.close()
+except (ImportError, RuntimeError):
+    print('This script needs the "matplotlib" module')
+    sys.exit()
  
  
 # =========================== #