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python-cheatsheet
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Format, Class, NumPy

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Jure Šorn 3 years ago
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  1. 26
      README.md
  2. 30
      index.html

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README.md
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@ -390,8 +390,8 @@ import re
Format
------
```python
<str> = f'{<el_1>}, {<el_2>}'
<str> = '{}, {}'.format(<el_1>, <el_2>)
<str> = f'{<el_1>}, {<el_2>}' # Or: '%s, %s' % (<el_1>, <el_2>)
<str> = '{}, {}'.format(<el_1>, <el_2>) # Or: '{0}, {1}'.format(<el_1>, <el_2>)
```
### Attributes
@ -1014,21 +1014,21 @@ class C(A, B): pass
### Property
**Pythonic way of implementing getters and setters.**
```python
class MyClass:
class Person:
@property
def a(self):
return self._a
def name(self):
return ' '.join(a if a == 'van' else a.title() for a in self._name)
@a.setter
def a(self, value):
self._a = value
@name.setter
def name(self, value):
self._name = value.lower().split()
```
```python
>>> obj = MyClass()
>>> obj.a = 123
>>> obj.a
123
>>> person = Person()
>>> person.name = ' gUiDo VaN rOsSuM '
>>> person.name
'Guido van Rossum'
```
### Dataclass
@ -2624,7 +2624,7 @@ import numpy as np
```
```python
<array> = np.array(<list>)
<array> = np.array(<list/list_of_lists>)
<array> = np.arange(from_inclusive, to_exclusive, ±step_size)
<array> = np.ones(<shape>)
<array> = np.random.randint(from_inclusive, to_exclusive, <shape>)

30
index.html
View File

@ -54,7 +54,7 @@
<body>
<header>
<aside>January 22, 2022</aside>
<aside>January 25, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -364,8 +364,8 @@ to_exclusive = &lt;range&gt;.stop
</code></pre></div>
<div><h2 id="format"><a href="#format" name="format">#</a>Format</h2><pre><code class="python language-python hljs">&lt;str&gt; = <span class="hljs-string">f'<span class="hljs-subst">{&lt;el_1&gt;}</span>, <span class="hljs-subst">{&lt;el_2&gt;}</span>'</span>
&lt;str&gt; = <span class="hljs-string">'{}, {}'</span>.format(&lt;el_1&gt;, &lt;el_2&gt;)
<div><h2 id="format"><a href="#format" name="format">#</a>Format</h2><pre><code class="python language-python hljs">&lt;str&gt; = <span class="hljs-string">f'<span class="hljs-subst">{&lt;el_1&gt;}</span>, <span class="hljs-subst">{&lt;el_2&gt;}</span>'</span> <span class="hljs-comment"># Or: '%s, %s' % (&lt;el_1&gt;, &lt;el_2&gt;)</span>
&lt;str&gt; = <span class="hljs-string">'{}, {}'</span>.format(&lt;el_1&gt;, &lt;el_2&gt;) <span class="hljs-comment"># Or: '{0}, {1}'.format(&lt;el_1&gt;, &lt;el_2&gt;)</span>
</code></pre></div>
<div><h3 id="attributes">Attributes</h3><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span><span class="hljs-keyword">from</span> collections <span class="hljs-keyword">import</span> namedtuple
@ -858,21 +858,21 @@ Z = dataclasses.make_dataclass(<span class="hljs-string">'Z'</span>, [<span clas
<pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>C.mro()
[&lt;<span class="hljs-class"><span class="hljs-title">class</span> '<span class="hljs-title">C</span>'&gt;, &lt;<span class="hljs-title">class</span> '<span class="hljs-title">A</span>'&gt;, &lt;<span class="hljs-title">class</span> '<span class="hljs-title">B</span>'&gt;, &lt;<span class="hljs-title">class</span> '<span class="hljs-title">object</span>'&gt;]
</span></code></pre>
<div><h3 id="property">Property</h3><p><strong>Pythonic way of implementing getters and setters.</strong></p><pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyClass</span>:</span>
<div><h3 id="property">Property</h3><p><strong>Pythonic way of implementing getters and setters.</strong></p><pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Person</span>:</span>
<span class="hljs-meta"> @property</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">a</span><span class="hljs-params">(self)</span>:</span>
<span class="hljs-keyword">return</span> self._a
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">name</span><span class="hljs-params">(self)</span>:</span>
<span class="hljs-keyword">return</span> <span class="hljs-string">' '</span>.join(a <span class="hljs-keyword">if</span> a == <span class="hljs-string">'van'</span> <span class="hljs-keyword">else</span> a.title() <span class="hljs-keyword">for</span> a <span class="hljs-keyword">in</span> self._name)
<span class="hljs-meta"> @a.setter</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">a</span><span class="hljs-params">(self, value)</span>:</span>
self._a = value
<span class="hljs-meta"> @name.setter</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">name</span><span class="hljs-params">(self, value)</span>:</span>
self._name = value.lower().split()
</code></pre></div>
<pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>obj = MyClass()
<span class="hljs-meta">&gt;&gt;&gt; </span>obj.a = <span class="hljs-number">123</span>
<span class="hljs-meta">&gt;&gt;&gt; </span>obj.a
<span class="hljs-number">123</span>
<pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>person = Person()
<span class="hljs-meta">&gt;&gt;&gt; </span>person.name = <span class="hljs-string">' gUiDo VaN rOsSuM '</span>
<span class="hljs-meta">&gt;&gt;&gt; </span>person.name
<span class="hljs-string">'Guido van Rossum'</span>
</code></pre>
<div><h3 id="dataclass">Dataclass</h3><p><strong>Decorator that automatically generates init(), repr() and eq() special methods.</strong></p><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> dataclasses <span class="hljs-keyword">import</span> dataclass, field
@ -2137,7 +2137,7 @@ drawer = output.GraphvizOutput(output_file=filename)
</code></pre></div>
<pre><code class="python language-python hljs">&lt;array&gt; = np.array(&lt;list&gt;)
<pre><code class="python language-python hljs">&lt;array&gt; = np.array(&lt;list/list_of_lists&gt;)
&lt;array&gt; = np.arange(from_inclusive, to_exclusive, ±step_size)
&lt;array&gt; = np.ones(&lt;shape&gt;)
&lt;array&gt; = np.random.randint(from_inclusive, to_exclusive, &lt;shape&gt;)
@ -2881,7 +2881,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>January 22, 2022</aside>
<aside>January 25, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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