Add dpnp.iterable function (#2208)

There was `__iter__` method of dpnp.ndarray implemented in scope of
#2206.

While this PR proposes to add implementation of `dpnp.iterable` function
which is intended to check if the object (including dpnp.ndarray) can be
iterated over.
The implementation leverages on NumPy call, which is based on attempt to
pass the object to `iter` function. 3f737be

Author: github-actions[bot]

.buildinfo

@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file records the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: 5ed3e8071361ce5f9018f129d6f2ce3c
+config: e2c599844a613400f27c0ec1aff4d087
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_modules/dpnp/dpnp_array.html

@@ -14,14 +14,14 @@
     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_array &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_array &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
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+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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_modules/dpnp/dpnp_flatiter.html

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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_flatiter &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_flatiter &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
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+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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_modules/dpnp/dpnp_iface.html

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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-      <script src="../../_static/documentation_options.js?v=d5a05a36"></script>
+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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_modules/dpnp/dpnp_iface_arraycreation.html

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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface_arraycreation &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface_arraycreation &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-      <script src="../../_static/documentation_options.js?v=d5a05a36"></script>
+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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_modules/dpnp/dpnp_iface_bitwise.html

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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface_bitwise &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface_bitwise &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
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+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface_counting &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface_counting &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-      <script src="../../_static/documentation_options.js?v=d5a05a36"></script>
+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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     </script>
 
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-  <title>dpnp.dpnp_iface_functional &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface_functional &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-      <script src="../../_static/documentation_options.js?v=d5a05a36"></script>
+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface_histograms &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface_histograms &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
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+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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_modules/dpnp/dpnp_iface_indexing.html

@@ -14,14 +14,14 @@
     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface_indexing &mdash; Data Parallel Extension for NumPy 0.17.0dev2+28.ged39ea75812 documentation</title>
+  <title>dpnp.dpnp_iface_indexing &mdash; Data Parallel Extension for NumPy 0.17.0dev3 documentation</title>
       <link rel="stylesheet" type="text/css" href="../../_static/pygments.css?v=fa44fd50" />
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       <script src="../../_static/_sphinx_javascript_frameworks_compat.js?v=2cd50e6c"></script>
-      <script src="../../_static/documentation_options.js?v=d5a05a36"></script>
+      <script src="../../_static/documentation_options.js?v=49df5c2b"></script>
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@@ -154,6 +154,7 @@ <h1>Source code for dpnp.dpnp_iface_indexing</h1><div class="highlight"><pre>
     <span class="s2">&quot;fill_diagonal&quot;</span><span class="p">,</span>
     <span class="s2">&quot;flatnonzero&quot;</span><span class="p">,</span>
     <span class="s2">&quot;indices&quot;</span><span class="p">,</span>
+    <span class="s2">&quot;iterable&quot;</span><span class="p">,</span>
     <span class="s2">&quot;ix_&quot;</span><span class="p">,</span>
     <span class="s2">&quot;mask_indices&quot;</span><span class="p">,</span>
     <span class="s2">&quot;ndindex&quot;</span><span class="p">,</span>
@@ -1145,6 +1146,50 @@ <h1>Source code for dpnp.dpnp_iface_indexing</h1><div class="highlight"><pre>
 
 
 
+<div class="viewcode-block" id="iterable">
+<a class="viewcode-back" href="../../reference/generated/dpnp.iterable.html#dpnp.iterable">[docs]</a>
+<span class="k">def</span> <span class="nf">iterable</span><span class="p">(</span><span class="n">y</span><span class="p">):</span>
+<span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
+<span class="sd">    Check whether or not an object can be iterated over.</span>
+
+<span class="sd">    For full documentation refer to :obj:`numpy.iterable`.</span>
+
+<span class="sd">    Parameters</span>
+<span class="sd">    ----------</span>
+<span class="sd">    y : object</span>
+<span class="sd">        Input object.</span>
+
+<span class="sd">    Returns</span>
+<span class="sd">    -------</span>
+<span class="sd">    out : bool</span>
+<span class="sd">        Return ``True`` if the object has an iterator method or is a sequence</span>
+<span class="sd">        and ``False`` otherwise.</span>
+
+<span class="sd">    Examples</span>
+<span class="sd">    --------</span>
+<span class="sd">    &gt;&gt;&gt; import dpnp as np</span>
+<span class="sd">    &gt;&gt;&gt; np.iterable([1, 2, 3])</span>
+<span class="sd">    True</span>
+<span class="sd">    &gt;&gt;&gt; np.iterable(2)</span>
+<span class="sd">    False</span>
+
+<span class="sd">    In most cases, the results of ``np.iterable(obj)`` are consistent with</span>
+<span class="sd">    ``isinstance(obj, collections.abc.Iterable)``. One notable exception is</span>
+<span class="sd">    the treatment of 0-dimensional arrays:</span>
+
+<span class="sd">    &gt;&gt;&gt; from collections.abc import Iterable</span>
+<span class="sd">    &gt;&gt;&gt; a = np.array(1.0)  # 0-dimensional array</span>
+<span class="sd">    &gt;&gt;&gt; isinstance(a, Iterable)</span>
+<span class="sd">    True</span>
+<span class="sd">    &gt;&gt;&gt; np.iterable(a)</span>
+<span class="sd">    False</span>
+
+<span class="sd">    &quot;&quot;&quot;</span>
+
+    <span class="k">return</span> <span class="n">numpy</span><span class="o">.</span><span class="n">iterable</span><span class="p">(</span><span class="n">y</span><span class="p">)</span></div>
+
+
+
 <div class="viewcode-block" id="ix_">
 <a class="viewcode-back" href="../../reference/generated/dpnp.ix_.html#dpnp.ix_">[docs]</a>
 <span class="k">def</span> <span class="nf">ix_</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>