Merge pull request #1176 from smichr/3815

3185: watch for evaluated zero in round
sympy · Mar 28, 2012 · b08aa6b · b08aa6b
2 parents 023f517 + 425676f
commit b08aa6b
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diff --git a/sympy/core/expr.py b/sympy/core/expr.py
@@ -2779,6 +2779,8 @@ def round(self, p=0):
         dps = prec_to_dps(max(precs)) if precs else None
 
         xpos = abs(x.n())
+        if not xpos:
+            return S.Zero
         try:
             mag_first_dig = int(ceil(log10(xpos)))
         except (ValueError, OverflowError):

diff --git a/sympy/core/tests/test_expr.py b/sympy/core/tests/test_expr.py
@@ -1346,3 +1346,6 @@ def test_round():
     assert str((pi/10 + E*I).round(2)) == '0.31 + 2.72*I'
     assert (pi/10 + E*I).round(2).as_real_imag() == (0.31, 2.72)
     assert (pi/10 + E*I).round(2) == Float(0.31, 2) +  I*Float(2.72, 3)
+
+    # issue 3815
+    assert (I**(I+3)).round(3) == Float('-0.208','')*I