fix <3.10 itertools

Author: cgevans

src/alhambra_mixes/mixes.py

@@ -330,7 +330,7 @@ def emphasize(text: str, tablefmt: str | TableFormat, strong: bool = False) -> s
     """
     # formats a title for a table produced using tabulate,
     # in the formats tabulate understands
-    if tablefmt in ["html", "unsafehtml", html_with_borders_tablefmt]:
+    if tablefmt in ["html", "unsafehtml", html_with_borders_tablefmt]: # type: ignore
         if strong:
             emph_text = f"<strong>{text}</strong>"
         else:
@@ -423,7 +423,7 @@ def _check_names(self, _: str, v: Any) -> None:
 
     def location(
         self, tablefmt: str | TableFormat = "pipe", split: bool = True
-    ) -> tuple[list[str], list[int]]:
+    ) -> tuple[str | list[str], list[int]]:
         "A formatted string (according to `tablefmt`) for the location of the component/components."
         if len(self.wells) == 0:
             return f"{self.plate}", []

tests/test_mixes.py

@@ -82,14 +82,18 @@ def test_invalid_wellrefs():
     with pytest.raises(ValueError):
         WellPos("i123nvalid string")
 
+def _itertools_pairwise(iterable): # FIXME: in 3.10
+    a, b = itertools.tee(iterable)
+    next(b, None)
+    return zip(a, b)
 
 def test_all_wellref_96():
     allbyrow96 = [f"{r}{c}" for r in "ABCDEFGH" for c in range(1, 13)]
-    for x, y in itertools.pairwise(allbyrow96):
+    for x, y in _itertools_pairwise(allbyrow96):
         assert WellPos(x).next_byrow() == y
 
     allbyrow96 = [f"{r}{c}" for c in range(1, 13) for r in "ABCDEFGH"]
-    for x, y in itertools.pairwise(allbyrow96):
+    for x, y in _itertools_pairwise(allbyrow96):
         assert WellPos(x).next_bycol() == y