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python-cheatsheet
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Introspection rewrite

pull/144/merge
Jure Šorn 4 months ago
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3194abebcf
2 changed files with 28 additions and 28 deletions
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  1. 26
      README.md
  2. 30
      index.html

26
README.md
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@ -2294,25 +2294,25 @@ CRITICAL:my_module:Running out of disk space.
Introspection
-------------
```python
<list> = dir() # Names of local vars, functions, classes and modules.
<dict> = vars() # Dict of local vars, functions, etc. Also locals().
<dict> = globals() # Dict of global vars, etc. (including '__builtins__').
<list> = dir() # List of of local names (including functions and classes).
<dict> = vars() # Dict of local names and their objects. Also locals().
<dict> = globals() # Dict of global names (for instance '__builtin__' module).
```
```python
<list> = dir(<obj>) # Names of all object's attributes (including methods).
<dict> = vars(<obj>) # Dict of writable attributes. Also <obj>.__dict__.
<bool> = hasattr(<obj>, '<attr_name>') # Checks if getattr() raises AttributeError.
value = getattr(<obj>, '<attr_name>') # Default value can be passed as the third argument.
setattr(<obj>, '<attr_name>', value) # Only works on objects with __dict__ attribute.
delattr(<obj>, '<attr_name>') # Same. Also `del <object>.<attr_name>`.
<list> = dir(<obj>) # Returns names of all object's attributes (incl. methods).
<dict> = vars(<obj>) # Returns dict of writable attributes. Also <obj>.__dict__.
<bool> = hasattr(<obj>, '<name>') # Checks if object possesses attribute with passed name.
value = getattr(<obj>, '<name>') # Returns object's attribute or raises AttributeError.
setattr(<obj>, '<name>', value) # Sets attribute. Only works on objects with __dict__.
delattr(<obj>, '<name>') # Deletes attribute from __dict__. Also `del <obj>.<name>`.
```
```python
<Sig> = inspect.signature(<function>) # Returns function's Signature object.
<dict> = <Sig>.parameters # Dict of Parameters. Also <Sig>.return_annotation.
<memb> = <Param>.kind # Member of ParamKind enum (Parameter.KEYWORD_ONLY, …).
<obj> = <Param>.default # Parameter.empty if missing. Also <Param>.annotation.
<Sig> = inspect.signature(<func>) # Returns function's Signature object. Can accept a class.
<dict> = <Sig>.parameters # Returns dict of Parameters. Also <Sig>.return_annotation.
<memb> = <Param>.kind # Returns ParameterKind member (Parameter.KEYWORD_ONLY, …).
<type> = <Param>.annotation # Returns Parameter.empty if missing. Also <Param>.default.
```

30
index.html
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@ -55,7 +55,7 @@
<body>
<header>
<aside>October 25, 2024</aside>
<aside>October 26, 2024</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -1877,22 +1877,22 @@ CRITICAL:my_module:Running out of disk space.
2023-02-07 23:21:01,430 CRITICAL:my_module:Running out of disk space.
</code></pre></div>
<div><h2 id="introspection"><a href="#introspection" name="introspection">#</a>Introspection</h2><pre><code class="python language-python hljs">&lt;list&gt; = dir() <span class="hljs-comment"># Names of local vars, functions, classes and modules.</span>
&lt;dict&gt; = vars() <span class="hljs-comment"># Dict of local vars, functions, etc. Also locals().</span>
&lt;dict&gt; = globals() <span class="hljs-comment"># Dict of global vars, etc. (including '__builtins__').</span>
<div><h2 id="introspection"><a href="#introspection" name="introspection">#</a>Introspection</h2><pre><code class="python language-python hljs">&lt;list&gt; = dir() <span class="hljs-comment"># List of of local names (including functions and classes).</span>
&lt;dict&gt; = vars() <span class="hljs-comment"># Dict of local names and their objects. Also locals().</span>
&lt;dict&gt; = globals() <span class="hljs-comment"># Dict of global names (for instance '__builtin__' module).</span>
</code></pre></div>
<pre><code class="python language-python hljs">&lt;list&gt; = dir(&lt;obj&gt;) <span class="hljs-comment"># Names of all object's attributes (including methods).</span>
&lt;dict&gt; = vars(&lt;obj&gt;) <span class="hljs-comment"># Dict of writable attributes. Also &lt;obj&gt;.__dict__.</span>
&lt;bool&gt; = hasattr(&lt;obj&gt;, <span class="hljs-string">'&lt;attr_name&gt;'</span>) <span class="hljs-comment"># Checks if getattr() raises AttributeError.</span>
value = getattr(&lt;obj&gt;, <span class="hljs-string">'&lt;attr_name&gt;'</span>) <span class="hljs-comment"># Default value can be passed as the third argument.</span>
setattr(&lt;obj&gt;, <span class="hljs-string">'&lt;attr_name&gt;'</span>, value) <span class="hljs-comment"># Only works on objects with __dict__ attribute.</span>
delattr(&lt;obj&gt;, <span class="hljs-string">'&lt;attr_name&gt;'</span>) <span class="hljs-comment"># Same. Also `del &lt;object&gt;.&lt;attr_name&gt;`.</span>
<pre><code class="python language-python hljs">&lt;list&gt; = dir(&lt;obj&gt;) <span class="hljs-comment"># Returns names of all object's attributes (incl. methods).</span>
&lt;dict&gt; = vars(&lt;obj&gt;) <span class="hljs-comment"># Returns dict of writable attributes. Also &lt;obj&gt;.__dict__.</span>
&lt;bool&gt; = hasattr(&lt;obj&gt;, <span class="hljs-string">'&lt;name&gt;'</span>) <span class="hljs-comment"># Checks if object possesses attribute with passed name.</span>
value = getattr(&lt;obj&gt;, <span class="hljs-string">'&lt;name&gt;'</span>) <span class="hljs-comment"># Returns object's attribute or raises AttributeError.</span>
setattr(&lt;obj&gt;, <span class="hljs-string">'&lt;name&gt;'</span>, value) <span class="hljs-comment"># Sets attribute. Only works on objects with __dict__.</span>
delattr(&lt;obj&gt;, <span class="hljs-string">'&lt;name&gt;'</span>) <span class="hljs-comment"># Deletes attribute from __dict__. Also `del &lt;obj&gt;.&lt;name&gt;`.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;Sig&gt; = inspect.signature(&lt;function&gt;) <span class="hljs-comment"># Returns function's Signature object.</span>
&lt;dict&gt; = &lt;Sig&gt;.parameters <span class="hljs-comment"># Dict of Parameters. Also &lt;Sig&gt;.return_annotation.</span>
&lt;memb&gt; = &lt;Param&gt;.kind <span class="hljs-comment"># Member of ParamKind enum (Parameter.KEYWORD_ONLY, …).</span>
&lt;obj&gt; = &lt;Param&gt;.default <span class="hljs-comment"># Parameter.empty if missing. Also &lt;Param&gt;.annotation.</span>
<pre><code class="python language-python hljs">&lt;Sig&gt; = inspect.signature(&lt;func&gt;) <span class="hljs-comment"># Returns function's Signature object. Can accept a class.</span>
&lt;dict&gt; = &lt;Sig&gt;.parameters <span class="hljs-comment"># Returns dict of Parameters. Also &lt;Sig&gt;.return_annotation.</span>
&lt;memb&gt; = &lt;Param&gt;.kind <span class="hljs-comment"># Returns ParameterKind member (Parameter.KEYWORD_ONLY, …).</span>
&lt;type&gt; = &lt;Param&gt;.annotation <span class="hljs-comment"># Returns Parameter.empty if missing. Also &lt;Param&gt;.default.</span>
</code></pre>
<div><h2 id="coroutines"><a href="#coroutines" name="coroutines">#</a>Coroutines</h2><ul>
<li><strong>Coroutines have a lot in common with threads, but unlike threads, they only give up control when they call another coroutine and they don’t use as much memory.</strong></li>
@ -2927,7 +2927,7 @@ $ deactivate <span class="hljs-comment"># Deactivates the active
<footer>
<aside>October 25, 2024</aside>
<aside>October 26, 2024</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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