Update src/sage/algebras/commutative_dga.py

Co-authored-by: Travis Scrimshaw <[email protected]>

Author: miguelmarco

src/sage/algebras/commutative_dga.py

@@ -1599,7 +1599,7 @@ def __call__(self, *values, **kwargs):
             if len(values) == 1 and isinstance(values[0], dict):
                 images = list(gens)
                 for (i, g) in enumerate(gens):
-                    if g in values[0].keys():
+                    if g in values[0]:
                         images[i] = values[0][g]
             elif len(values) == len(gens):
                 images = list(values)