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python-cheatsheet
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List and Datetime

pull/115/head
Jure Šorn 3 years ago
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2 changed files with 23 additions and 23 deletions
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  1. 20
      README.md
  2. 26
      index.html

20
README.md
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@ -29,7 +29,7 @@ if __name__ == '__main__': # Runs main() if file wasn't imported.
List
----
```python
<list> = <list>[from_inclusive : to_exclusive : ±step_size]
<list> = <list>[<slice>] # Or: <list>[from_inclusive : to_exclusive : ±step]
```
```python
@ -38,10 +38,10 @@ List
```
```python
<list>.sort()
<list>.reverse()
<list> = sorted(<collection>)
<iter> = reversed(<list>)
<list>.sort() # Sorts in ascending order.
<list>.reverse() # Reverses the list in-place.
<list> = sorted(<collection>) # Returns a new sorted list.
<iter> = reversed(<list>) # Returns reversed iterator.
```
```python
@ -643,7 +643,6 @@ from dateutil.tz import UTC, tzlocal, gettz, datetime_exists, resolve_imaginary
### Format
```python
>>> from datetime import datetime
>>> dt = datetime.strptime('2015-05-14 23:39:00.00 +0200', '%Y-%m-%d %H:%M:%S.%f %z')
>>> dt.strftime("%A, %dth of %B '%y, %I:%M%p %Z")
"Thursday, 14th of May '15, 11:39PM UTC+02:00"
@ -653,10 +652,11 @@ from dateutil.tz import UTC, tzlocal, gettz, datetime_exists, resolve_imaginary
### Arithmetics
```python
<D/DT> = <D/DT> ± <TD> # Returned datetime can fall into missing hour.
<TD> = <D/DTn> - <D/DTn> # Returns the difference, ignoring time jumps.
<TD> = <DTa> - <DTa> # Ignores time jumps if they share tzinfo object.
<TD> = <DT_UTC> - <DT_UTC> # Convert DTs to UTC to get the actual delta.
<D/DT> = <D/DT> ± <TD> # Returned datetime can fall into missing hour.
<TD> = <D/DTn> - <D/DTn> # Returns the difference, ignoring time jumps.
<TD> = <DTa> - <DTa> # Ignores time jumps if they share tzinfo object.
<TD> = <TD> * <real> # Also: <TD> = abs(<TD>) and <TD> = <TD> ±% <TD>
<float> = <TD> / <TD> # How many weeks/years there are in TD. Also '//'.
```

26
index.html
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@ -226,7 +226,7 @@ pre.prettyprint {
<body>
<header>
<aside>October 30, 2021</aside>
<aside>November 16, 2021</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -253,16 +253,16 @@ pre.prettyprint {
main()
</code></pre></div>
<div><h2 id="list"><a href="#list" name="list">#</a>List</h2><pre><code class="python language-python hljs">&lt;list&gt; = &lt;list&gt;[from_inclusive : to_exclusive : ±step_size]
<div><h2 id="list"><a href="#list" name="list">#</a>List</h2><pre><code class="python language-python hljs">&lt;list&gt; = &lt;list&gt;[&lt;slice&gt;] <span class="hljs-comment"># Or: &lt;list&gt;[from_inclusive : to_exclusive : ±step]</span>
</code></pre></div>
<pre><code class="python language-python hljs">&lt;list&gt;.append(&lt;el&gt;) <span class="hljs-comment"># Or: &lt;list&gt; += [&lt;el&gt;]</span>
&lt;list&gt;.extend(&lt;collection&gt;) <span class="hljs-comment"># Or: &lt;list&gt; += &lt;collection&gt;</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;list&gt;.sort()
&lt;list&gt;.reverse()
&lt;list&gt; = sorted(&lt;collection&gt;)
&lt;iter&gt; = reversed(&lt;list&gt;)
<pre><code class="python language-python hljs">&lt;list&gt;.sort() <span class="hljs-comment"># Sorts in ascending order.</span>
&lt;list&gt;.reverse() <span class="hljs-comment"># Reverses the list in-place.</span>
&lt;list&gt; = sorted(&lt;collection&gt;) <span class="hljs-comment"># Returns a new sorted list.</span>
&lt;iter&gt; = reversed(&lt;list&gt;) <span class="hljs-comment"># Returns reversed iterator.</span>
</code></pre>
<pre><code class="python language-python hljs">sum_of_elements = sum(&lt;collection&gt;)
elementwise_sum = [sum(pair) <span class="hljs-keyword">for</span> pair <span class="hljs-keyword">in</span> zip(list_a, list_b)]
@ -723,8 +723,7 @@ to_exclusive = &lt;range&gt;.stop
&lt;float&gt; = &lt;DTa&gt;.timestamp() <span class="hljs-comment"># Seconds since the Epoch, from DTa.</span>
</code></pre></div>
<div><h3 id="format-1">Format</h3><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span><span class="hljs-keyword">from</span> datetime <span class="hljs-keyword">import</span> datetime
<span class="hljs-meta">&gt;&gt;&gt; </span>dt = datetime.strptime(<span class="hljs-string">'2015-05-14 23:39:00.00 +0200'</span>, <span class="hljs-string">'%Y-%m-%d %H:%M:%S.%f %z'</span>)
<div><h3 id="format-1">Format</h3><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>dt = datetime.strptime(<span class="hljs-string">'2015-05-14 23:39:00.00 +0200'</span>, <span class="hljs-string">'%Y-%m-%d %H:%M:%S.%f %z'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>dt.strftime(<span class="hljs-string">"%A, %dth of %B '%y, %I:%M%p %Z"</span>)
<span class="hljs-string">"Thursday, 14th of May '15, 11:39PM UTC+02:00"</span>
</code></pre></div>
@ -733,10 +732,11 @@ to_exclusive = &lt;range&gt;.stop
<li><strong><code class="python hljs"><span class="hljs-string">'%Z'</span></code> only accepts <code class="python hljs"><span class="hljs-string">'UTC/GMT'</span></code> and local timezone's code. <code class="python hljs"><span class="hljs-string">'%z'</span></code> also accepts <code class="python hljs"><span class="hljs-string">'±HH:MM'</span></code>.</strong></li>
<li><strong>For abbreviated weekday and month use <code class="python hljs"><span class="hljs-string">'%a'</span></code> and <code class="python hljs"><span class="hljs-string">'%b'</span></code>.</strong></li>
</ul>
<div><h3 id="arithmetics">Arithmetics</h3><pre><code class="python language-python apache hljs">&lt;D/DT&gt; = &lt;D/DT&gt; ± &lt;TD&gt; <span class="hljs-comment"># Returned datetime can fall into missing hour.</span>
&lt;TD&gt; = &lt;D/DTn&gt; - &lt;D/DTn&gt; <span class="hljs-comment"># Returns the difference, ignoring time jumps.</span>
&lt;TD&gt; = &lt;DTa&gt; - &lt;DTa&gt; <span class="hljs-comment"># Ignores time jumps if they share tzinfo object.</span>
&lt;TD&gt; = &lt;DT_UTC&gt; - &lt;DT_UTC&gt; <span class="hljs-comment"># Convert DTs to UTC to get the actual delta.</span>
<div><h3 id="arithmetics">Arithmetics</h3><pre><code class="python language-python apache hljs">&lt;D/DT&gt; = &lt;D/DT&gt; ± &lt;TD&gt; <span class="hljs-comment"># Returned datetime can fall into missing hour.</span>
&lt;TD&gt; = &lt;D/DTn&gt; - &lt;D/DTn&gt; <span class="hljs-comment"># Returns the difference, ignoring time jumps.</span>
&lt;TD&gt; = &lt;DTa&gt; - &lt;DTa&gt; <span class="hljs-comment"># Ignores time jumps if they share tzinfo object.</span>
&lt;TD&gt; = &lt;TD&gt; * &lt;real&gt; <span class="hljs-comment"># Also: &lt;TD&gt; = abs(&lt;TD&gt;) and &lt;TD&gt; = &lt;TD&gt; ±% &lt;TD&gt;</span>
&lt;float&gt; = &lt;TD&gt; / &lt;TD&gt; <span class="hljs-comment"># How many weeks/years there are in TD. Also '//'.</span>
</code></pre></div>
<div><h2 id="arguments"><a href="#arguments" name="arguments">#</a>Arguments</h2><div><h3 id="insidefunctioncall">Inside Function Call</h3><pre><code class="python language-python hljs">&lt;function&gt;(&lt;positional_args&gt;) <span class="hljs-comment"># f(0, 0)</span>
@ -3020,7 +3020,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>October 30, 2021</aside>
<aside>November 16, 2021</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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