replace list(template_vars) with copy(template_vars)

cylc · Nov 10, 2020 · 42e834f · 42e834f
1 parent 1f61ba1
commit 42e834f
Showing 1 changed file with 2 additions and 3 deletions.
diff --git a/cylc/flow/config.py b/cylc/flow/config.py
@@ -218,12 +218,11 @@ def __init__(
         self.mem_log("config.py: before RawSuiteConfig init")
         if output_fname:
             output_fname = os.path.expandvars(output_fname)
-        if not template_vars:
-            template_vars = []
+        # Copy template_vars to prevent modification of object by parsec.
         self.pcfg = RawSuiteConfig(
             fpath,
             output_fname,
-            list(template_vars)
+            copy(template_vars)
         )
         self.mem_log("config.py: after RawSuiteConfig init")
         self.mem_log("config.py: before get(sparse=True")