Merge pull request #465 from isuruf/pos

Implement unary addition

Author: isuruf

symengine/lib/symengine_wrapper.in.pyx

@@ -951,6 +951,9 @@ cdef class Basic(object):
     def __neg__(Basic self not None):
         return c2py(symengine.neg(self.thisptr))
 
+    def __pos__(self):
+        return self
+
     def __abs__(Basic self not None):
         return c2py(symengine.abs(self.thisptr))
 

symengine/tests/test_arit.py

@@ -95,6 +95,12 @@ def test_arit8():
     assert (2*y**(-2*x**2)) * (3*y**(2*x**2)) == 6
 
 
+def test_unary():
+    x = Symbol("x")
+    assert -x == 0 - x
+    assert +x == x
+
+
 def test_expand1():
     x = Symbol("x")
     y = Symbol("y")