Fix is_positive

Author: isuruf

symengine/lib/symengine_wrapper.pyx

@@ -722,15 +722,15 @@ cdef class Number(Basic):
 
     @property
     def is_positive(self):
-        return deref(symengine.rcp_static_cast_Number(A.thisptr)).is_positive()
+        return deref(symengine.rcp_static_cast_Number(self.thisptr)).is_positive()
 
     @property
     def is_negative(self):
-        return deref(symengine.rcp_static_cast_Number(A.thisptr)).is_negative()
+        return deref(symengine.rcp_static_cast_Number(self.thisptr)).is_negative()
 
     @property
     def is_zero(self):
-        return deref(symengine.rcp_static_cast_Number(A.thisptr)).is_zero()
+        return deref(symengine.rcp_static_cast_Number(self.thisptr)).is_zero()
 
     @property
     def is_nonzero(self):
@@ -746,7 +746,7 @@ cdef class Number(Basic):
 
     @property
     def is_complex(self):
-        return deref(symengine.rcp_static_cast_Number(A.thisptr)).is_complex()
+        return deref(symengine.rcp_static_cast_Number(self.thisptr)).is_complex()
 
 cdef class Integer(Number):