Fix for Python 3.7 (#577)

* Fix for Python 3.7

* flake8

* flake8

rbc/external.py

@@ -111,9 +111,10 @@ def match_signature(self, atypes):
 
         satypes = ", ".join(map(str, atypes))
         raise TypeError(
-            f"{compile_target=}: found no matching function type to the given argument types"
-            f" `{satypes}` and device `{device}` while processing `{self.name}`."
-            f" Available function type is `{this_type}`."
+            f"compile_target={compile_target}: found no matching function type "
+            f"to the given argument types `{satypes}` and device `{device}` "
+            f"while processing `{self.name}`. Available function type is "
+            f"`{this_type}`."
         )
 
     def get_codegen(self):

rbc/targetinfo.py

@@ -119,7 +119,7 @@ def add_library(self, lib):
     def set_compile_target(self, target_name):
         """Set target function name being compiled.
         """
-        assert target_name is None or self._compile_target is None,\
+        assert target_name is None or self._compile_target is None, \
             (target_name, self._compile_target)
         self._compile_target = target_name
 

rbc/tests/heavydb/test_array.py

@@ -207,7 +207,7 @@ def array_getitem_double(x, i):
     desrc, result = heavydb.sql_execute(query)
     for a, item in result:
         assert a[2] == item
-        assert type(a[2]) == type(item)
+        assert type(a[2]) is type(item)
 
     @heavydb('float(float[], int64)')
     def array_getitem_float(x, i):
@@ -217,7 +217,7 @@ def array_getitem_float(x, i):
     desrc, result = heavydb.sql_execute(query)
     for a, item in result:
         assert a[2] == item
-        assert type(a[2]) == type(item)
+        assert type(a[2]) is type(item)
 
 
 def test_sum(heavydb):