DOC: Add note to savez about naming variables with keyword `file`.

1 files changed, 4 insertions, 0 deletions

diff --git a/numpy/lib/npyio.py b/numpy/lib/npyio.py
index 9552579cf..5780a05bb 100644
--- a/numpy/lib/npyio.py
+++ b/numpy/lib/npyio.py
@@ -586,6 +586,10 @@ def savez(file, *args, **kwds):
     inside the ZIP archive. Therefore, keys should be valid filenames.
     E.g., avoid keys that begin with ``/`` or contain ``.``.
 
+    When naming variables with keyword arguments, it is not possible to name a
+    variable ``file``, as this would cause the ``file`` argument to be defined
+    twice in the call to ``savez``.
+
     Examples
     --------
     >>> from tempfile import TemporaryFile