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<h1>Source code for future.types.newlist</h1><div class="highlight"><pre>
<span></span><span class="sd">"""</span>
<span class="sd">A list subclass for Python 2 that behaves like Python 3's list.</span>
<span class="sd">The primary difference is that lists have a .copy() method in Py3.</span>
<span class="sd">Example use:</span>
<span class="sd">>>> from builtins import list</span>
<span class="sd">>>> l1 = list() # instead of {} for an empty list</span>
<span class="sd">>>> l1.append('hello')</span>
<span class="sd">>>> l2 = l1.copy()</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">copy</span>
<span class="kn">from</span> <span class="nn">future.utils</span> <span class="k">import</span> <span class="n">with_metaclass</span>
<span class="kn">from</span> <span class="nn">future.types.newobject</span> <span class="k">import</span> <span class="n">newobject</span>
<span class="n">_builtin_list</span> <span class="o">=</span> <span class="nb">list</span>
<span class="n">ver</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[:</span><span class="mi">2</span><span class="p">]</span>
<span class="k">class</span> <span class="nc">BaseNewList</span><span class="p">(</span><span class="nb">type</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__instancecheck__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">instance</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">cls</span> <span class="o">==</span> <span class="n">newlist</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="n">_builtin_list</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">instance</span><span class="o">.</span><span class="vm">__class__</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span>
<div class="viewcode-block" id="newlist"><a class="viewcode-back" href="../../../reference.html#future.builtins.newlist">[docs]</a><span class="k">class</span> <span class="nc">newlist</span><span class="p">(</span><span class="n">with_metaclass</span><span class="p">(</span><span class="n">BaseNewList</span><span class="p">,</span> <span class="n">_builtin_list</span><span class="p">)):</span>
<span class="sd">"""</span>
<span class="sd"> A backport of the Python 3 list object to Py2</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="newlist.copy"><a class="viewcode-back" href="../../../reference.html#future.builtins.newlist.copy">[docs]</a> <span class="k">def</span> <span class="nf">copy</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> L.copy() -> list -- a shallow copy of L</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">copy</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span></div>
<div class="viewcode-block" id="newlist.clear"><a class="viewcode-back" href="../../../reference.html#future.builtins.newlist.clear">[docs]</a> <span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""L.clear() -> None -- remove all items from L"""</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="p">)):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span></div>
<span class="k">def</span> <span class="nf">__new__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> list() -> new empty list</span>
<span class="sd"> list(iterable) -> new list initialized from iterable's items</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">newlist</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="fm">__new__</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">type</span><span class="p">(</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="o">==</span> <span class="n">newlist</span><span class="p">:</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">newlist</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="fm">__new__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__add__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="n">newlist</span><span class="p">(</span><span class="nb">super</span><span class="p">(</span><span class="n">newlist</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__add__</span><span class="p">(</span><span class="n">value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">__radd__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">left</span><span class="p">):</span>
<span class="s2">" left + self "</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">newlist</span><span class="p">(</span><span class="n">left</span><span class="p">)</span> <span class="o">+</span> <span class="bp">self</span>
<span class="k">except</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> x.__getitem__(y) <==> x[y]</span>
<span class="sd"> Warning: a bug in Python 2.x prevents indexing via a slice from</span>
<span class="sd"> returning a newlist object.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">y</span><span class="p">,</span> <span class="nb">slice</span><span class="p">):</span>
<span class="k">return</span> <span class="n">newlist</span><span class="p">(</span><span class="nb">super</span><span class="p">(</span><span class="n">newlist</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__getitem__</span><span class="p">(</span><span class="n">y</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">newlist</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__getitem__</span><span class="p">(</span><span class="n">y</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__native__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Hook for the future.utils.native() function</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__nonzero__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">></span> <span class="mi">0</span></div>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'newlist'</span><span class="p">]</span>
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