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<h1>Source code for django.utils.module_loading</h1><div class="highlight"><pre>
<span class="kn">import</span> <span class="nn">imp</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">from</span> <span class="nn">django.core.exceptions</span> <span class="kn">import</span> <span class="n">ImproperlyConfigured</span>
<span class="kn">from</span> <span class="nn">django.utils</span> <span class="kn">import</span> <span class="n">six</span>
<span class="kn">from</span> <span class="nn">django.utils.importlib</span> <span class="kn">import</span> <span class="n">import_module</span>
<div class="viewcode-block" id="import_by_path"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.module_loading.import_by_path">[docs]</a><span class="k">def</span> <span class="nf">import_by_path</span><span class="p">(</span><span class="n">dotted_path</span><span class="p">,</span> <span class="n">error_prefix</span><span class="o">=</span><span class="s">''</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Import a dotted module path and return the attribute/class designated by the</span>
<span class="sd"> last name in the path. Raise ImproperlyConfigured if something goes wrong.</span>
<span class="sd"> """</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">module_path</span><span class="p">,</span> <span class="n">class_name</span> <span class="o">=</span> <span class="n">dotted_path</span><span class="o">.</span><span class="n">rsplit</span><span class="p">(</span><span class="s">'.'</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span><span class="s">"</span><span class="si">%s%s</span><span class="s"> doesn't look like a module path"</span> <span class="o">%</span> <span class="p">(</span>
<span class="n">error_prefix</span><span class="p">,</span> <span class="n">dotted_path</span><span class="p">))</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">module</span> <span class="o">=</span> <span class="n">import_module</span><span class="p">(</span><span class="n">module_path</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ImportError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
<span class="n">msg</span> <span class="o">=</span> <span class="s">'</span><span class="si">%s</span><span class="s">Error importing module </span><span class="si">%s</span><span class="s">: "</span><span class="si">%s</span><span class="s">"'</span> <span class="o">%</span> <span class="p">(</span>
<span class="n">error_prefix</span><span class="p">,</span> <span class="n">module_path</span><span class="p">,</span> <span class="n">e</span><span class="p">)</span>
<span class="n">six</span><span class="o">.</span><span class="n">reraise</span><span class="p">(</span><span class="n">ImproperlyConfigured</span><span class="p">,</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span><span class="n">msg</span><span class="p">),</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()[</span><span class="mi">2</span><span class="p">])</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">attr</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="n">class_name</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s">Module "</span><span class="si">%s</span><span class="s">" does not define a "</span><span class="si">%s</span><span class="s">" attribute/class'</span> <span class="o">%</span> <span class="p">(</span>
<span class="n">error_prefix</span><span class="p">,</span> <span class="n">module_path</span><span class="p">,</span> <span class="n">class_name</span><span class="p">))</span>
<span class="k">return</span> <span class="n">attr</span>
</div>
<span class="k">def</span> <span class="nf">module_has_submodule</span><span class="p">(</span><span class="n">package</span><span class="p">,</span> <span class="n">module_name</span><span class="p">):</span>
<span class="sd">"""See if 'module' is in 'package'."""</span>
<span class="n">name</span> <span class="o">=</span> <span class="s">"."</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="n">package</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="n">module_name</span><span class="p">])</span>
<span class="k">try</span><span class="p">:</span>
<span class="c"># None indicates a cached miss; see mark_miss() in Python/import.c.</span>
<span class="k">return</span> <span class="n">sys</span><span class="o">.</span><span class="n">modules</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">package_path</span> <span class="o">=</span> <span class="n">package</span><span class="o">.</span><span class="n">__path__</span> <span class="c"># No __path__, then not a package.</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="c"># Since the remainder of this function assumes that we're dealing with</span>
<span class="c"># a package (module with a __path__), so if it's not, then bail here.</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="k">for</span> <span class="n">finder</span> <span class="ow">in</span> <span class="n">sys</span><span class="o">.</span><span class="n">meta_path</span><span class="p">:</span>
<span class="k">if</span> <span class="n">finder</span><span class="o">.</span><span class="n">find_module</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">package_path</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">for</span> <span class="n">entry</span> <span class="ow">in</span> <span class="n">package_path</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="c"># Try the cached finder.</span>
<span class="n">finder</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">path_importer_cache</span><span class="p">[</span><span class="n">entry</span><span class="p">]</span>
<span class="k">if</span> <span class="n">finder</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="c"># Implicit import machinery should be used.</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">file_</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">imp</span><span class="o">.</span><span class="n">find_module</span><span class="p">(</span><span class="n">module_name</span><span class="p">,</span> <span class="p">[</span><span class="n">entry</span><span class="p">])</span>
<span class="k">if</span> <span class="n">file_</span><span class="p">:</span>
<span class="n">file_</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">continue</span>
<span class="c"># Else see if the finder knows of a loader.</span>
<span class="k">elif</span> <span class="n">finder</span><span class="o">.</span><span class="n">find_module</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="c"># No cached finder, so try and make one.</span>
<span class="k">for</span> <span class="n">hook</span> <span class="ow">in</span> <span class="n">sys</span><span class="o">.</span><span class="n">path_hooks</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">finder</span> <span class="o">=</span> <span class="n">hook</span><span class="p">(</span><span class="n">entry</span><span class="p">)</span>
<span class="c"># XXX Could cache in sys.path_importer_cache</span>
<span class="k">if</span> <span class="n">finder</span><span class="o">.</span><span class="n">find_module</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="c"># Once a finder is found, stop the search.</span>
<span class="k">break</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="c"># Continue the search for a finder.</span>
<span class="k">continue</span>
<span class="k">else</span><span class="p">:</span>
<span class="c"># No finder found.</span>
<span class="c"># Try the implicit import machinery if searching a directory.</span>
<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">entry</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">file_</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">imp</span><span class="o">.</span><span class="n">find_module</span><span class="p">(</span><span class="n">module_name</span><span class="p">,</span> <span class="p">[</span><span class="n">entry</span><span class="p">])</span>
<span class="k">if</span> <span class="n">file_</span><span class="p">:</span>
<span class="n">file_</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="c"># XXX Could insert None or NullImporter</span>
<span class="k">else</span><span class="p">:</span>
<span class="c"># Exhausted the search, so the module cannot be found.</span>
<span class="k">return</span> <span class="bp">False</span>
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