[Bug] [lang] Fix error when subscripting a dict

.gitignore

@@ -56,7 +56,6 @@ __pycache__
 *.jpg
 *.egg-info
 .tlang_cache
-.tidle_*
 /taichi/common/version.h
 /taichi/common/commit_hash.h
 /python/test_env

python/taichi/lang/impl.py

@@ -97,7 +97,7 @@ def subscript(value, *indices):
     if isinstance(value, np.ndarray):
         return value.__getitem__(*indices)
 
-    if isinstance(value, tuple) or isinstance(value, list):
+    if isinstance(value, (tuple, list, dict)):
         assert len(indices) == 1
         return value[indices[0]]
 
@@ -243,6 +243,7 @@ def layout():
 
         for func in self.materialize_callbacks:
             func()
+        self.materialize_callbacks = []
 
     def clear(self):
         if self.prog:
@@ -534,12 +535,11 @@ def static(x, *xs):
         return [static(x)] + [static(x) for x in xs]
     import types
     import taichi as ti
-    if isinstance(x, (bool, int, float, range, list, tuple, enumerate,
-                      ti.ndrange, ti.GroupedNDRange)) or x is None:
-        return x
-    elif isinstance(x, ti.lang.expr.Expr) and x.ptr.is_global_var():
+    if isinstance(x,
+                  (bool, int, float, range, list, tuple, enumerate, ti.ndrange,
+                   ti.GroupedNDRange, zip, filter, map)) or x is None:
         return x
-    elif isinstance(x, ti.Matrix) and x.is_global():
+    elif isinstance(x, (ti.Expr, ti.Matrix)) and x.is_global():
         return x
     elif isinstance(x, (types.FunctionType, types.MethodType)):
         return x

python/taichi/lang/ndrange.py

@@ -3,7 +3,7 @@ def __init__(self, *args):
         args = list(args)
         for i in range(len(args)):
             if isinstance(args[i], list):
-                args[i] = list(args[i])
+                args[i] = tuple(args[i])
             if not isinstance(args[i], tuple):
                 args[i] = (0, args[i])
             assert len(args[i]) == 2