Merge pull request #3084 from tony-jinwoo-ahn/tan

Add tan() and tanh() for cmath

Lib/test/test_cmath.py

@@ -56,9 +56,9 @@ class CMathTests(unittest.TestCase):
     #
     # list of all functions in cmath
     test_functions = [getattr(cmath, fname) for fname in [
-        'sin','cos','log','log10','sqrt','acosh'
+        'sin','cos','log','log10','sqrt','acosh','tan','tanh'
         # 'exp','acos','asin','asinh',
-        # 'atan','atanh','sinh','cosh','tan','tanh'
+        # 'atan','atanh','sinh','cosh'
         ]]
     # test first and second arguments independently for 2-argument log
     # test_functions.append(lambda x : cmath.log(x, 1729. + 0j))
@@ -590,8 +590,6 @@ class CMathTests(unittest.TestCase):
         self.assertTrue(cmath.isinf(complex(NAN, INF)))
         self.assertTrue(cmath.isinf(complex(INF, NAN)))
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     @requires_IEEE_754
     def testTanhSign(self):
         for z in complex_zeros:

vm/src/stdlib/cmath.rs

@@ -113,6 +113,18 @@ mod cmath {
         z.to_complex().acosh()
     }
 
+    /// Return the tangent of z.
+    #[pyfunction]
+    fn tan(z: IntoPyComplex) -> Complex64 {
+        z.to_complex().tan()
+    }
+
+    /// Return the hyperbolic tangent of z.
+    #[pyfunction]
+    fn tanh(z: IntoPyComplex) -> Complex64 {
+        z.to_complex().tanh()
+    }
+
     #[derive(FromArgs)]
     struct IsCloseArgs {
         #[pyarg(positional)]