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Datetime, Function
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‎README.md‎

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@@ -374,7 +374,7 @@ import re
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* **Argument `'flags=re.IGNORECASE'` can be used with all functions.**
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* **Argument `'flags=re.MULTILINE'` makes `'^'` and `'$'` match the start/end of each line.**
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* **Argument `'flags=re.DOTALL'` makes `'.'` also accept the `'\n'`.**
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* **`'re.compile(<regex>)'` returns a Pattern object with methods sub(), findall(), …**
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* **`'re.compile(<regex>)'` returns a Pattern object with methods sub(), findall(), etc.**
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### Match Object
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```python
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<Fraction> = fractions.Fraction(0, 1) # Or: Fraction(numerator=0, denominator=1)
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<Decimal> = decimal.Decimal(<str/int>) # Or: Decimal((sign, digits, exponent))
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```
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* **Decimal numbers are stored exactly, unlike most floats where: `'1.1 + 2.2 != 3.3'`.**
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* **Decimal numbers are stored exactly, unlike most floats where `'1.1 + 2.2 != 3.3'`.**
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* **Floats can be compared with: `'math.isclose(<float>, <float>)'`.**
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* **Precision of decimal operations is set with: `'decimal.getcontext().prec = <int>'`.**
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* **Bools can be used anywhere ints can, because bool is a subclass of int: `'True + 1 == 2'`.**
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>>> dt.strftime("%dth of %B '%y (%a), %I:%M %p %Z")
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"14th of August '25 (Thu), 11:39 PM UTC+02:00"
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```
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* **`'%z'` accepts `'±HH[:]MM'` and returns `'±HHMM'` or empty string if datetime is naive.**
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* **`'%Z'` accepts `'UTC/GMT'` and local timezone's code and returns timezone's name, `'UTC[±HH:MM]'` if timezone is nameless, or an empty string if datetime is naive.**
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* **`'%z'` accepts `'±HH[:]MM'` and returns `'±HHMM'` or empty string if object is naive.**
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* **`'%Z'` accepts `'UTC/GMT'` and local timezone's code and returns timezone's name, `'UTC[±HH:MM]'` if timezone is nameless, or an empty string if object is naive.**
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### Arithmetics
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```python
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def <func_name>(<nondefault_args>, <default_args>): ... # E.g. `def func(x, y=0): ...`.
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```
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* **Function returns None if it doesn't encounter `'return <obj/exp>'` statement.**
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* **Before modifying a global variable from within the function run `'global <var_name>'`.**
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* **Run `'global <var_name>'` inside the function before assigning to global variable.**
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* **Default values are evaluated when function is first encountered in the scope. Any mutation of a mutable default value will persist between invocations!**
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### Function Call

‎index.html‎

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<body>
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<header>
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<aside>March 30, 2025</aside>
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<aside>April 1, 2025</aside>
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<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
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</header>
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<li><strong>Argument <code class="python hljs"><span class="hljs-string">'flags=re.IGNORECASE'</span></code> can be used with all functions.</strong></li>
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<li><strong>Argument <code class="python hljs"><span class="hljs-string">'flags=re.MULTILINE'</span></code> makes <code class="python hljs"><span class="hljs-string">'^'</span></code> and <code class="python hljs"><span class="hljs-string">'$'</span></code> match the start/end of each line.</strong></li>
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<li><strong>Argument <code class="python hljs"><span class="hljs-string">'flags=re.DOTALL'</span></code> makes <code class="python hljs"><span class="hljs-string">'.'</span></code> also accept the <code class="python hljs"><span class="hljs-string">'\n'</span></code>.</strong></li>
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<li><strong><code class="python hljs"><span class="hljs-string">'re.compile(&lt;regex&gt;)'</span></code> returns a Pattern object with methods sub(), findall(), …</strong></li>
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<li><strong><code class="python hljs"><span class="hljs-string">'re.compile(&lt;regex&gt;)'</span></code> returns a Pattern object with methods sub(), findall(), etc.</strong></li>
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</ul>
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<div><h3 id="matchobject">Match Object</h3><pre><code class="python language-python hljs">&lt;str&gt; = &lt;Match&gt;.group() <span class="hljs-comment"># Returns the whole match. Also group(0).</span>
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&lt;str&gt; = &lt;Match&gt;.group(<span class="hljs-number">1</span>) <span class="hljs-comment"># Returns part inside the first brackets.</span>
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</code></pre></div>
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<ul>
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<li><strong>Decimal numbers are stored exactly, unlike most floats where: <code class="python hljs"><span class="hljs-string">'1.1 + 2.2 != 3.3'</span></code>.</strong></li>
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<li><strong>Decimal numbers are stored exactly, unlike most floats where <code class="python hljs"><span class="hljs-string">'1.1 + 2.2 != 3.3'</span></code>.</strong></li>
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<li><strong>Floats can be compared with: <code class="python hljs"><span class="hljs-string">'math.isclose(&lt;float&gt;, &lt;float&gt;)'</span></code>.</strong></li>
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<li><strong>Precision of decimal operations is set with: <code class="python hljs"><span class="hljs-string">'decimal.getcontext().prec = &lt;int&gt;'</span></code>.</strong></li>
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<li><strong>Bools can be used anywhere ints can, because bool is a subclass of int: <code class="python hljs"><span class="hljs-string">'True + 1 == 2'</span></code>.</strong></li>
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</code></pre></div>
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<ul>
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<li><strong><code class="python hljs"><span class="hljs-string">'%z'</span></code> accepts <code class="python hljs"><span class="hljs-string">'±HH[:]MM'</span></code> and returns <code class="python hljs"><span class="hljs-string">'±HHMM'</span></code> or empty string if datetime is naive.</strong></li>
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<li><strong><code class="python hljs"><span class="hljs-string">'%Z'</span></code> accepts <code class="python hljs"><span class="hljs-string">'UTC/GMT'</span></code> and local timezone's code and returns timezone's name, <code class="python hljs"><span class="hljs-string">'UTC[±HH:MM]'</span></code> if timezone is nameless, or an empty string if datetime is naive.</strong></li>
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<li><strong><code class="python hljs"><span class="hljs-string">'%z'</span></code> accepts <code class="python hljs"><span class="hljs-string">'±HH[:]MM'</span></code> and returns <code class="python hljs"><span class="hljs-string">'±HHMM'</span></code> or empty string if object is naive.</strong></li>
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<li><strong><code class="python hljs"><span class="hljs-string">'%Z'</span></code> accepts <code class="python hljs"><span class="hljs-string">'UTC/GMT'</span></code> and local timezone's code and returns timezone's name, <code class="python hljs"><span class="hljs-string">'UTC[±HH:MM]'</span></code> if timezone is nameless, or an empty string if object is naive.</strong></li>
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</ul>
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<div><h3 id="arithmetics">Arithmetics</h3><pre><code class="python language-python apache hljs">&lt;bool&gt; = &lt;D/T/DTn&gt; &gt; &lt;D/T/DTn&gt; <span class="hljs-comment"># Ignores time jumps (fold attribute). Also ==.</span>
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&lt;bool&gt; = &lt;DTa&gt; &gt; &lt;DTa&gt; <span class="hljs-comment"># Ignores time jumps if they share tzinfo object.</span>
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<ul>
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<li><strong>Function returns None if it doesn't encounter <code class="python hljs"><span class="hljs-string">'return &lt;obj/exp&gt;'</span></code> statement.</strong></li>
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<li><strong>Before modifying a global variable from within the function run <code class="python hljs"><span class="hljs-string">'global &lt;var_name&gt;'</span></code>.</strong></li>
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<li><strong>Run <code class="python hljs"><span class="hljs-string">'global &lt;var_name&gt;'</span></code> inside the function before assigning to global variable.</strong></li>
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<li><strong>Default values are evaluated when function is first encountered in the scope. Any mutation of a mutable default value will persist between invocations!</strong></li>
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</ul>
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<div><h3 id="functioncall">Function Call</h3><pre><code class="python language-python hljs">&lt;obj&gt; = &lt;function&gt;(&lt;positional_args&gt;) <span class="hljs-comment"># E.g. `func(0, 0)`.</span>
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<footer>
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<aside>March 30, 2025</aside>
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<aside>April 1, 2025</aside>
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<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
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</footer>
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