refactor: when importlib is unavailable fallback to importlib_metadata

Signed-off-by: Vassilis Vassiladis <[email protected]>

requirement_files/requirements_base_3.7.txt

@@ -1,4 +1,6 @@
 # Numpy dropped support for python 3.7 in v1.22
 numpy < 1.22
 # Matplotlib dropped support for python 3.7 in v3.6.0
-matplotlib < 3.6.0
+matplotlib < 3.6.0
+# 6.8.0 requires python 3.8 or later
+importlib_metadata < 6.8.0

scripts/elaunch.py

@@ -1105,7 +1105,10 @@ def arg_to_bool(name, val):
 
 
 def build_parser() -> NoSystemExitOptparseOptionParser:
-    import importlib_metadata
+    try:
+        import importlib.metadata as importlib_metadata
+    except ImportError:
+        import importlib_metadata
 
     # HACK: Daresbury system dependant
     projectDir = os.path.split(os.path.expanduser("~"))[0]

scripts/ewrap.py

@@ -24,7 +24,11 @@
 import experiment.runtime.output
 import experiment.model.frontends.flowir
 import experiment.model.storage
-import importlib_metadata
+
+try:
+    import importlib.metadata as importlib_metadata
+except ImportError:
+    import importlib_metadata
 import yaml
 
 usage = "usage: %prog [options] [package]"