ENH: Added sanity check to printoptions

See issue #18254

1 files changed, 7 insertions, 0 deletions

diff --git a/numpy/core/arrayprint.py b/numpy/core/arrayprint.py
index 3fade4824..2d772c778 100644
--- a/numpy/core/arrayprint.py
+++ b/numpy/core/arrayprint.py
@@ -78,6 +78,7 @@ def _make_options_dict(precision=None, threshold=None, edgeitems=None,
     if legacy not in [None, False, '1.13']:
         warnings.warn("legacy printing option can currently only be '1.13' or "
                       "`False`", stacklevel=3)
+
     if threshold is not None:
         # forbid the bad threshold arg suggested by stack overflow, gh-12351
         if not isinstance(threshold, numbers.Number):
@@ -85,6 +86,12 @@ def _make_options_dict(precision=None, threshold=None, edgeitems=None,
         if np.isnan(threshold):
             raise ValueError("threshold must be non-NAN, try "
                              "sys.maxsize for untruncated representation")
+
+    if precision is not None:
+        # forbid the bad precision arg as suggested by issue #18254
+        if not isinstance(precision, int):
+            raise TypeError('precision must be an integer')
+
     return options