Adding warning to MaterialProperties for invalid keyword args (#258)

* Adding warning to `MaterialProperties` for invalid keyword args

* Minor format edit

* Change to error and suggest closest match in error message

* Typo

* Minor format edit

* Minor format edit

---------

Co-authored-by: Alasdair Gray <alachris@umich.edu>

tacs/constitutive.pyx

@@ -12,6 +12,9 @@
 
 #distutils: language=c++
 
+import warnings
+import difflib
+
 # For the use of MPI
 from mpi4py.libmpi cimport *
 cimport mpi4py.MPI as MPI
@@ -216,9 +219,27 @@ cdef class MaterialProperties:
         cdef TacsScalar kappa3 = 230.0
 
         ISOTROPIC_KEYS = ["rho", "E", "nu", "G", "ys", "alpha", "specific_heat", "kappa"]
+        ORTHOTROPIC_KEYS = ["E1", "E2", "E3",
+                            "nu12", "nu13", "nu23",
+                            "G12", "G13", "G23",
+                            "T1", "T2", "T3",
+                            "C1", "C2", "C3",
+                            "S12", "S13", "S23",
+                            "Xt", "Yt", "Xc", "Yc", "S",
+                            "alpha1", "alpha2", "alpha3",
+                            "kappa1", "kappa2", "kappa3"]
+        ALL_KEYS = ISOTROPIC_KEYS + ORTHOTROPIC_KEYS
+
+        # Check for any invalid/misspelled inputs
+        for input_key in kwargs:
+            if input_key not in ALL_KEYS:
+                guess = difflib.get_close_matches(input_key, ALL_KEYS, n=1, cutoff=0.0)[0]
+                raise ValueError(f"{input_key} is not a valid material property. Perhaps you meant {guess}? \n"
+                                 "Acceptable arguments are: \n" +
+                                 ", ".join(ALL_KEYS),)
 
         # Check if any input provided in kwargs was orthotropic
-        if any(input_key not in ISOTROPIC_KEYS for input_key in kwargs):
+        if any(input_key in ORTHOTROPIC_KEYS for input_key in kwargs):
             is_orthotropic = True
         else:
             is_orthotropic = False