drop unused jit() function

graph_tools/utils.py

@@ -4,8 +4,7 @@ def _init_():
     UnionFind, DynamicLRU, \
     max_, select, prod, split_on_none, powerset, \
     matrix_to_formula, \
-    stabilize_period, matrix_formula_period, \
-    jit
+    stabilize_period, matrix_formula_period
 
   from itertools import chain, combinations
   from functools import reduce
@@ -15,13 +14,6 @@ def _init_():
   import inspect
 
 
-  try:
-    from numba import njit as jit
-  except:
-    print("Numba not found!")
-    def jit(fn): return fn
-
-
   def push_tests(cls):
     mod = inspect.getmodule(cls)
     if not hasattr(mod, "__test__"): setattr(mod, "__test__", {})