Make hoomd import optional.

For use in CI which tests project init, but doesn't execute any
simulations.

hoomd_validation/alj_2d.py

@@ -7,7 +7,11 @@
 import math
 import os
 
-import hoomd
+try:
+    import hoomd
+except ModuleNotFoundError as e:
+    print(f"Warning: {e}")
+
 import matplotlib
 import matplotlib.figure
 import matplotlib.style

hoomd_validation/custom_actions.py

@@ -3,8 +3,10 @@
 
 """This file contains all custom actions needed for this project."""
 
-import hoomd
-
+try:
+    import hoomd
+except ModuleNotFoundError as e:
+    print(f"Warning: {e}")
 
 class ComputeDensity(hoomd.custom.Action):
     """Compute the density of particles in the system.

hoomd_validation/hard_disk.py

@@ -7,7 +7,11 @@
 import json
 import os
 
-import hoomd
+try:
+    import hoomd
+except ModuleNotFoundError as e:
+    print(f"Warning: {e}")
+
 import matplotlib
 import matplotlib.figure
 import matplotlib.style

hoomd_validation/lj_fluid.py

@@ -9,7 +9,11 @@
 import math
 import os
 
-import hoomd
+try:
+    import hoomd
+except ModuleNotFoundError as e:
+    print(f"Warning: {e}")
+
 import matplotlib
 import matplotlib.figure
 import matplotlib.style

hoomd_validation/lj_union.py

@@ -9,7 +9,11 @@
 import math
 import os
 
-import hoomd
+try:
+    import hoomd
+except ModuleNotFoundError as e:
+    print(f"Warning: {e}")
+
 import matplotlib
 import matplotlib.figure
 import matplotlib.style

hoomd_validation/util.py

@@ -6,10 +6,13 @@
 import os
 
 import h5py
-import hoomd
 import numpy
 import signac
 
+try:
+    import hoomd
+except ModuleNotFoundError as e:
+    print(f"Warning: {e}")
 
 def get_job_filename(sim_mode, device, name, file_type):
     """Construct a job filename."""