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python-cheatsheet
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Bitwise Operators, Datetime, OS Commands

pull/74/merge
Jure Šorn 2 years ago
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2 changed files with 12 additions and 12 deletions
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  1. 10
      README.md
  2. 14
      index.html

10
README.md
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@ -537,8 +537,8 @@ from random import random, randint, choice, shuffle, gauss, seed
<int> = <int> & <int> # And (0b1100 & 0b1010 == 0b1000).
<int> = <int> | <int> # Or (0b1100 | 0b1010 == 0b1110).
<int> = <int> ^ <int> # Xor (0b1100 ^ 0b1010 == 0b0110).
<int> = <int> << n_bits # Left shift (>> for right).
<int> = ~<int> # Not (also: -<int> - 1).
<int> = <int> << n_bits # Left shift. Use >> for right.
<int> = ~<int> # Not. Also -<int> - 1.
```
@ -645,11 +645,11 @@ from dateutil.tz import UTC, tzlocal, gettz, datetime_exists, resolve_imaginary
### Format
```python
>>> dt = datetime.strptime('2015-05-14 23:39:00.00 +02:00', '%Y-%m-%d %H:%M:%S.%f %z')
>>> dt = datetime.strptime('2015-05-14 23:39:00.00 +2000', '%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"
```
* **`'%Z'` only accepts `'UTC/GMT'` and local timezone's code. `'%z'` also accepts `'±HHMM'`.**
* **`'%Z'` only accepts `'UTC/GMT'` and local timezone's code. `'%z'` also accepts `'±02:00'`.**
* **For abbreviated weekday and month use `'%a'` and `'%b'`.**
### Arithmetics
@ -1718,7 +1718,7 @@ shutil.rmtree(<path>) # Deletes the directory.
### Shell Commands
```python
<pipe> = os.popen('<command>') # Executes command in sh/cmd and returns its stdout pipe.
<str> = <pipe>.read() # Waits for EOF and returns result. Also readline/s().
<str> = <pipe>.read(size=-1) # Reads 'size' chars or until EOF. Also readline/s().
<int> = <pipe>.close() # Closes the pipe. Returns None on success, int on error.
```

14
index.html
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@ -54,7 +54,7 @@
<body>
<header>
<aside>April 18, 2022</aside>
<aside>April 19, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -486,8 +486,8 @@ to_exclusive = &lt;range&gt;.stop
<div><h3 id="bitwiseoperators">Bitwise Operators</h3><pre><code class="python language-python hljs">&lt;int&gt; = &lt;int&gt; &amp; &lt;int&gt; <span class="hljs-comment"># And (0b1100 &amp; 0b1010 == 0b1000).</span>
&lt;int&gt; = &lt;int&gt; | &lt;int&gt; <span class="hljs-comment"># Or (0b1100 | 0b1010 == 0b1110).</span>
&lt;int&gt; = &lt;int&gt; ^ &lt;int&gt; <span class="hljs-comment"># Xor (0b1100 ^ 0b1010 == 0b0110).</span>
&lt;int&gt; = &lt;int&gt; &lt;&lt; n_bits <span class="hljs-comment"># Left shift (&gt;&gt; for right).</span>
&lt;int&gt; = ~&lt;int&gt; <span class="hljs-comment"># Not (also: -&lt;int&gt; - 1).</span>
&lt;int&gt; = &lt;int&gt; &lt;&lt; n_bits <span class="hljs-comment"># Left shift. Use &gt;&gt; for right.</span>
&lt;int&gt; = ~&lt;int&gt; <span class="hljs-comment"># Not. Also -&lt;int&gt; - 1.</span>
</code></pre></div>
<div><h2 id="combinatorics"><a href="#combinatorics" name="combinatorics">#</a>Combinatorics</h2><ul>
@ -572,13 +572,13 @@ 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>dt = datetime.strptime(<span class="hljs-string">'2015-05-14 23:39:00.00 +02:00'</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 +2000'</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>
<ul>
<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">'±HHMM'</span></code>.</strong></li>
<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">'±02:00'</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>
@ -1445,7 +1445,7 @@ os.rmdir(&lt;path&gt;) <span class="hljs-comment"># Deletes t
shutil.rmtree(&lt;path&gt;) <span class="hljs-comment"># Deletes the directory.</span>
</code></pre>
<div><h3 id="shellcommands">Shell Commands</h3><pre><code class="python language-python hljs">&lt;pipe&gt; = os.popen(<span class="hljs-string">'&lt;command&gt;'</span>) <span class="hljs-comment"># Executes command in sh/cmd and returns its stdout pipe.</span>
&lt;str&gt; = &lt;pipe&gt;.read() <span class="hljs-comment"># Waits for EOF and returns result. Also readline/s().</span>
&lt;str&gt; = &lt;pipe&gt;.read(size=<span class="hljs-number">-1</span>) <span class="hljs-comment"># Reads 'size' chars or until EOF. Also readline/s().</span>
&lt;int&gt; = &lt;pipe&gt;.close() <span class="hljs-comment"># Closes the pipe. Returns None on success, int on error.</span>
</code></pre></div>
@ -2887,7 +2887,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>April 18, 2022</aside>
<aside>April 19, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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