bpo-31082: Use "iterable" in the docstring for functools.reduce() (GH-20796)

1 files changed, 8 insertions, 7 deletions

diff --git a/Lib/functools.py b/Lib/functools.py
index 5cab497..b1f1fe8 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -236,14 +236,14 @@ _initial_missing = object()
 
 def reduce(function, sequence, initial=_initial_missing):
     """
-    reduce(function, sequence[, initial]) -> value
+    reduce(function, iterable[, initial]) -> value
 
-    Apply a function of two arguments cumulatively to the items of a sequence,
-    from left to right, so as to reduce the sequence to a single value.
-    For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates
+    Apply a function of two arguments cumulatively to the items of a sequence
+    or iterable, from left to right, so as to reduce the iterable to a single
+    value.  For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates
     ((((1+2)+3)+4)+5).  If initial is present, it is placed before the items
-    of the sequence in the calculation, and serves as a default when the
-    sequence is empty.
+    of the iterable in the calculation, and serves as a default when the
+    iterable is empty.
     """
 
     it = iter(sequence)
@@ -252,7 +252,8 @@ def reduce(function, sequence, initial=_initial_missing):
         try:
             value = next(it)
         except StopIteration:
-            raise TypeError("reduce() of empty sequence with no initial value") from None
+            raise TypeError(
+                "reduce() of empty iterable with no initial value") from None
     else:
         value = initial