Skip to content

Commit

Permalink
Format, Numbers, Decorator, Class
Browse files Browse the repository at this point in the history
  • Loading branch information
@gto76
gto76 committed Apr 15, 2022
1 parent fccd460 commit 4f6d5cf
Show file tree
Hide file tree
Showing 3 changed files with 23 additions and 10 deletions.
10 changes: 6 additions & 4 deletions README.md
View file
Original file line number Diff line number Diff line change
Expand Up @@ -472,7 +472,7 @@ Format
+--------------+----------------+----------------+----------------+----------------+
```
* **When both rounding up and rounding down are possible, the one that returns result with even last digit is chosen. That makes `'{6.5:.0f}'` a `'6'` and `'{7.5:.0f}'` an `'8'`.**
* **This rule only works for numbers that can be represented exactly by a float (`.5`, `.25`, …).**
* **This rule only effects numbers that can be represented exactly by a float (`.5`, `.25`, …).**

### Ints
```python
Expand All @@ -493,7 +493,7 @@ Numbers
<Decimal> = decimal.Decimal(<str/int>) # Or: Decimal((sign, digits, exponent))
```
* **`'int(<str>)'` and `'float(<str>)'` raise ValueError on malformed strings.**
* **All decimal numbers are stored exactly, unlike floats where `'1.1 + 2.2 != 3.3'`.**
* **Decimal numbers are stored exactly, unlike most floats where `'1.1 + 2.2 != 3.3'`.**
* **Precision of decimal operations is set with: `'decimal.getcontext().prec = <int>'`.**

### Basic Functions
Expand Down Expand Up @@ -921,6 +921,7 @@ from functools import lru_cache
def fib(n):
return n if n < 2 else fib(n-2) + fib(n-1)
```
* **Default size of the cache is 128 values. Passing `'maxsize=None'` makes it unbounded.**
* **CPython interpreter limits recursion depth to 1000 by default. To increase it use `'sys.setrecursionlimit(<depth>)'`.**

### Parametrized Decorator
Expand All @@ -942,6 +943,7 @@ def debug(print_result=False):
def add(x, y):
return x + y
```
* **Using only `'@debug'` to decorate the add() function would not work here, because debug would then receive the add() function as a 'print_result' argument. Decorators can however manually check if the argument they received is a function and act accordingly.**


Class
Expand Down Expand Up @@ -974,9 +976,9 @@ raise Exception(<el>)

#### Repr() use cases:
```python
print([<el>])
print/str/repr([<el>])
f'{<el>!r}'
Z = dataclasses.make_dataclass('Z', ['a']); print(Z(<el>))
Z = dataclasses.make_dataclass('Z', ['a']); print/str/repr(Z(<el>))
>>> <el>
```

Expand Down
16 changes: 10 additions & 6 deletions index.html
View file
Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@

<body>
<header>
<aside>April 12, 2022</aside>
<aside>April 15, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>

Expand Down Expand Up @@ -437,7 +437,7 @@

<ul>
<li><strong>When both rounding up and rounding down are possible, the one that returns result with even last digit is chosen. That makes <code class="python hljs"><span class="hljs-string">'{6.5:.0f}'</span></code> a <code class="python hljs"><span class="hljs-string">'6'</span></code> and <code class="python hljs"><span class="hljs-string">'{7.5:.0f}'</span></code> an <code class="python hljs"><span class="hljs-string">'8'</span></code>.</strong></li>
<li><strong>This rule only works for numbers that can be represented exactly by a float (<code class="python hljs"><span class="hljs-number">.5</span></code>, <code class="python hljs"><span class="hljs-number">.25</span></code>, …).</strong></li>
<li><strong>This rule only effects numbers that can be represented exactly by a float (<code class="python hljs"><span class="hljs-number">.5</span></code>, <code class="python hljs"><span class="hljs-number">.25</span></code>, …).</strong></li>
</ul>
<div><h3 id="ints">Ints</h3><pre><code class="python language-python hljs">{<span class="hljs-number">90</span>:c} <span class="hljs-comment"># 'Z'</span>
{<span class="hljs-number">90</span>:b} <span class="hljs-comment"># '1011010'</span>
Expand All @@ -454,7 +454,7 @@

<ul>
<li><strong><code class="python hljs"><span class="hljs-string">'int(&lt;str&gt;)'</span></code> and <code class="python hljs"><span class="hljs-string">'float(&lt;str&gt;)'</span></code> raise ValueError on malformed strings.</strong></li>
<li><strong>All decimal numbers are stored exactly, unlike floats where <code class="python hljs"><span class="hljs-string">'1.1 + 2.2 != 3.3'</span></code>.</strong></li>
<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>
<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>
</ul>
<div><h3 id="basicfunctions">Basic Functions</h3><pre><code class="python language-python hljs">&lt;num&gt; = pow(&lt;num&gt;, &lt;num&gt;) <span class="hljs-comment"># Or: &lt;num&gt; ** &lt;num&gt;</span>
Expand Down Expand Up @@ -784,6 +784,7 @@


<ul>
<li><strong>Default size of the cache is 128 values. Passing <code class="python hljs"><span class="hljs-string">'maxsize=None'</span></code> makes it unbounded.</strong></li>
<li><strong>CPython interpreter limits recursion depth to 1000 by default. To increase it use <code class="python hljs"><span class="hljs-string">'sys.setrecursionlimit(&lt;depth&gt;)'</span></code>.</strong></li>
</ul>
<div><h3 id="parametrizeddecorator">Parametrized Decorator</h3><p><strong>A decorator that accepts arguments and returns a normal decorator that accepts a function.</strong></p><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> functools <span class="hljs-keyword">import</span> wraps
Expand All @@ -804,6 +805,9 @@
</code></pre></div>


<ul>
<li><strong>Using only <code class="python hljs"><span class="hljs-string">'@debug'</span></code> to decorate the add() function would not work here, because debug would then receive the add() function as a 'print_result' argument. Decorators can however manually check if the argument they received is a function and act accordingly.</strong></li>
</ul>
<div><h2 id="class"><a href="#class" name="class">#</a>Class</h2><pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> &lt;<span class="hljs-title">name</span>&gt;:</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, a)</span>:</span>
self.a = a
Expand All @@ -829,9 +833,9 @@
<span class="hljs-keyword">raise</span> Exception(&lt;el&gt;)
</code></pre></div>

<div><h4 id="reprusecases">Repr() use cases:</h4><pre><code class="python language-python hljs">print([&lt;el&gt;])
<div><h4 id="reprusecases">Repr() use cases:</h4><pre><code class="python language-python hljs">print/str/repr([&lt;el&gt;])
<span class="hljs-string">f'<span class="hljs-subst">{&lt;el&gt;!r}</span>'</span>
Z = dataclasses.make_dataclass(<span class="hljs-string">'Z'</span>, [<span class="hljs-string">'a'</span>]); print(Z(&lt;el&gt;))
Z = dataclasses.make_dataclass(<span class="hljs-string">'Z'</span>, [<span class="hljs-string">'a'</span>]); print/str/repr(Z(&lt;el&gt;))
<span class="hljs-meta">&gt;&gt;&gt; </span>&lt;el&gt;
</code></pre></div>

Expand Down Expand Up @@ -2885,7 +2889,7 @@


<footer>
<aside>April 12, 2022</aside>
<aside>April 15, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

Expand Down
7 changes: 7 additions & 0 deletions parse.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,12 @@ const LRU_CACHE =
'<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">fib</span><span class="hljs-params">(n)</span>:</span>\n' +
' <span class="hljs-keyword">return</span> n <span class="hljs-keyword">if</span> n &lt; <span class="hljs-number">2</span> <span class="hljs-keyword">else</span> fib(n-<span class="hljs-number">2</span>) + fib(n-<span class="hljs-number">1</span>)\n';

const REPR_USE_CASES =
'print/str/repr([&lt;el&gt;])\n' +
'<span class="hljs-string">f\'<span class="hljs-subst">{&lt;el&gt;!r}</span>\'</span>\n' +
'Z = dataclasses.make_dataclass(<span class="hljs-string">\'Z\'</span>, [<span class="hljs-string">\'a\'</span>]); print/str/repr(Z(&lt;el&gt;))\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>&lt;el&gt;\n';

const CONSTRUCTOR_OVERLOADING =
'<span class="hljs-class"><span class="hljs-keyword">class</span> &lt;<span class="hljs-title">name</span>&gt;:</span>\n' +
' <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, a=<span class="hljs-keyword">None</span>)</span>:</span>\n' +
Expand Down Expand Up @@ -562,6 +568,7 @@ function fixClasses() {
function fixHighlights() {
$(`code:contains(@lru_cache(maxsize=None))`).html(LRU_CACHE);
$(`code:contains((self, a=None):)`).html(CONSTRUCTOR_OVERLOADING);
$(`code:contains(print/str/repr([<el>]))`).html(REPR_USE_CASES);
$(`code:contains(make_dataclass(\'<class_name>\')`).html(DATACLASS);
$(`code:contains(shutil.copy)`).html(SHUTIL_COPY);
$(`code:contains(os.rename)`).html(OS_RENAME);
Expand Down

0 comments on commit 4f6d5cf

Please sign in to comment.