add `tuple?` function `hy.core`

`tuple?` will test if the argument is an instance of tuple.

NEWS.rst

@@ -12,6 +12,7 @@ New Features
 * Format strings with embedded Hy code (e.g., `f"The sum is {(+ x y)}"`)
   are now supported, even on Pythons earlier than 3.6.
 * New list? function.
+* New tuple? function.
 
 Bug Fixes
 ------------------------------

docs/language/core.rst

@@ -951,6 +951,25 @@ Returns ``True`` if *x* is a symbol.
    => (symbol? '[a b c])
    False
 
+
+.. _tuple?-fn:
+
+tuple?
+------
+
+Usage: ``(tuple? x)``
+
+Returns ``True`` if *x* is a tuple.
+
+.. code-block:: hy
+
+   => (tuple? (, 42 44))
+   True
+
+   => (tuple? [42 44])
+   False
+
+
 .. _zero?-fn:
 
 zero?

hy/core/language.hy

@@ -206,6 +206,9 @@ Return series of accumulated sums (or other binary function results)."
 (defn list? [x]
   (isinstance x list))
 
+(defn tuple? [x]
+  (isinstance x tuple))
+
 (defn symbol? [s]
   "Check if `s` is a symbol."
   (instance? HySymbol s))
@@ -461,4 +464,4 @@ Even objects with the __name__ magic will work."
     macroexpand-1 mangle map merge-with multicombinations name neg? none? nth
     numeric? odd? partition permutations pos? product range read read-str
     remove repeat repeatedly rest reduce second some string string? symbol?
-    take take-nth take-while unmangle xor tee zero? zip zip-longest])
+    take take-nth take-while tuple? unmangle xor tee zero? zip zip-longest])

tests/native_tests/core.hy

@@ -272,6 +272,11 @@ result['y in globals'] = 'y' in globals()")
   (assert-false (list? "hello"))
   (assert-true (list? [1 2 3])))
 
+(defn test-tuple? []
+  "NATIVE: testing the tuple? function"
+  (assert-false (tuple? [4 5]))
+  (assert-true (tuple? (, 4 5))))
+
 (defn test-gensym []
   "NATIVE: testing the gensym function"
   (import [hy.models [HySymbol]])