Add math.exp2

Author: jopemachine

Lib/test/test_math.py

@@ -485,6 +485,17 @@ def testExp(self):
         self.assertTrue(math.isnan(math.exp(NAN)))
         self.assertRaises(OverflowError, math.exp, 1000000)
 
+    def testExp2(self):
+        self.assertRaises(TypeError, math.exp2)
+        self.ftest('exp2(-1)', math.exp2(-1), 0.5)
+        self.ftest('exp2(0)', math.exp2(0), 1)
+        self.ftest('exp2(1)', math.exp2(1), 2)
+        self.ftest('exp2(2.3)', math.exp2(2.3), 4.924577653379665)
+        self.assertEqual(math.exp2(INF), INF)
+        self.assertEqual(math.exp2(NINF), 0.)
+        self.assertTrue(math.isnan(math.exp2(NAN)))
+        self.assertRaises(OverflowError, math.exp2, 1000000)
+
     def testFabs(self):
         self.assertRaises(TypeError, math.fabs)
         self.ftest('fabs(-1)', math.fabs(-1), 1)

stdlib/src/math.rs

@@ -120,6 +120,11 @@ mod math {
         call_math_func!(exp, x, vm)
     }
 
+    #[pyfunction]
+    fn exp2(x: ArgIntoFloat, vm: &VirtualMachine) -> PyResult<f64> {
+        call_math_func!(exp2, x, vm)
+    }
+
     #[pyfunction]
     fn expm1(x: ArgIntoFloat, vm: &VirtualMachine) -> PyResult<f64> {
         call_math_func!(exp_m1, x, vm)