BUG: core: format 'nan' and 'inf' also in array repr by default (#1050)

2 files changed, 14 insertions, 4 deletions

diff --git a/numpy/core/arrayprint.py b/numpy/core/arrayprint.py
index 934d08dc8..9b6d1c036 100644
--- a/numpy/core/arrayprint.py
+++ b/numpy/core/arrayprint.py
@@ -27,8 +27,8 @@ _summaryThreshold = 1000 # total items > triggers array summarization
 _float_output_precision = 8
 _float_output_suppress_small = False
 _line_width = 75
-_nan_str = 'NaN'
-_inf_str = 'Inf'
+_nan_str = 'nan'
+_inf_str = 'inf'
 
 if sys.version_info[0] >= 3:
     from functools import reduce
@@ -59,9 +59,9 @@ def set_printoptions(precision=None, threshold=None, edgeitems=None,
         Whether or not suppress printing of small floating point values
         using scientific notation (default False).
     nanstr : str, optional
-        String representation of floating point not-a-number (default NaN).
+        String representation of floating point not-a-number (default nan).
     infstr : str, optional
-        String representation of floating point infinity (default Inf).
+        String representation of floating point infinity (default inf).
 
     See Also
     --------
diff --git a/numpy/core/tests/test_arrayprint.py b/numpy/core/tests/test_arrayprint.py
new file mode 100644
index 000000000..954869727
--- /dev/null
+++ b/numpy/core/tests/test_arrayprint.py
@@ -0,0 +1,10 @@
+import numpy as np
+from numpy.testing import *
+
+class TestArrayRepr(object):
+    def test_nan_inf(self):
+        x = np.array([np.nan, np.inf])
+        assert_equal(repr(x), 'array([ nan,  inf])')
+
+if __name__ == "__main__":
+    run_module_suite()