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authorjohannst <johannst@users.noreply.github.com>2021-11-28 22:26:50 +0000
committerjohannst <johannst@users.noreply.github.com>2021-11-28 22:26:50 +0000
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+ <main>
+ <h1><a class="header" href="#python" id="python">python</a></h1>
+<h2><a class="header" href="#decorator-a-hrefhttpswwwonline-pythoncomiddie0gpyuruna" id="decorator-a-hrefhttpswwwonline-pythoncomiddie0gpyuruna">Decorator [<a href="https://www.online-python.com/IDdiE0gpYU">run</a>]</a></h2>
+<p>Some decorator examples with type annotation.</p>
+<pre><code class="language-python">from typing import Callable
+
+def log(f: Callable[[int], None]) -&gt; Callable[[int], None]:
+ def inner(x: int):
+ print(f&quot;log::inner f={f.__name__} x={x}&quot;)
+ f(x)
+ return inner
+
+@log
+def some_fn(x: int):
+ print(f&quot;some_fn x={x}&quot;)
+
+
+def log_tag(tag: str) -&gt; Callable[[Callable[[int], None]], Callable[[int], None]]:
+ def decorator(f: Callable[[int], None]) -&gt; Callable[[int], None]:
+ def inner(x: int):
+ print(f&quot;log_tag::inner f={f.__name__} tag={tag} x={x}&quot;)
+ f(x)
+ return inner
+ return decorator
+
+@log_tag(&quot;some_tag&quot;)
+def some_fn2(x: int):
+ print(f&quot;some_fn2 x={x}&quot;)
+</code></pre>
+<h2><a class="header" href="#walrus-operator-a-hrefhttpswwwonline-pythoncom9t12pvmkvyruna" id="walrus-operator-a-hrefhttpswwwonline-pythoncom9t12pvmkvyruna">Walrus operator [<a href="https://www.online-python.com/9T12PvmKVy">run</a>]</a></h2>
+<p>Walrus operator <code>:=</code> added since <strong>python 3.8</strong>.</p>
+<pre><code class="language-python">from typing import Optional
+
+# Example 1: if let statements
+
+def foo(ret: Optional[int]) -&gt; Optional[int]:
+ return ret
+
+if r := foo(None):
+ print(f&quot;foo(None) -&gt; {r}&quot;)
+
+if r := foo(1337):
+ print(f&quot;foo(1337) -&gt; {r}&quot;)
+
+# Example 2: while let statements
+
+toks = iter(['a', 'b', 'c'])
+while tok := next(toks, None):
+ print(f&quot;{tok}&quot;)
+
+# Example 3: list comprehension
+
+print([tok for t in [&quot; a&quot;, &quot; &quot;, &quot; b &quot;] if (tok := t.strip())])
+</code></pre>
+<h2><a class="header" href="#a-hrefhttpsdocspythonorg3libraryunittesthtmlunittesta-a-hrefhttpswwwonline-pythoncom2fit4ucbziruna" id="a-hrefhttpsdocspythonorg3libraryunittesthtmlunittesta-a-hrefhttpswwwonline-pythoncom2fit4ucbziruna"><a href="https://docs.python.org/3/library/unittest.html">Unittest</a> [<a href="https://www.online-python.com/2fit4UcbzI">run</a>]</a></h2>
+<p>Run unittests directly from the command line as <br />
+<code>python3 -m unittest -v test</code></p>
+<p>Optionally pass <code>-k &lt;patter&gt;</code> to only run subset of tests.</p>
+<pre><code class="language-python"># file: test.py
+
+import unittest
+
+class MyTest(unittest.TestCase):
+ def setUp(self):
+ pass
+ def tearDown(self):
+ pass
+ # Tests need to start with the prefix 'test'.
+ def test_foo(self):
+ self.assertEqual(1 + 2, 3)
+ def test_bar(self):
+ with self.assertRaises(IndexError):
+ list()[0]
+</code></pre>
+<h2><a class="header" href="#a-hrefhttpsdocspythonorg3librarydoctesthtmldoctesta-a-hrefhttpswwwonline-pythoncomlzst51unihruna" id="a-hrefhttpsdocspythonorg3librarydoctesthtmldoctesta-a-hrefhttpswwwonline-pythoncomlzst51unihruna"><a href="https://docs.python.org/3/library/doctest.html">Doctest</a> [<a href="https://www.online-python.com/LZst51UNIH">run</a>]</a></h2>
+<p>Run doctests directly from the command line as <br />
+<code>python -m doctest -v test.py</code></p>
+<pre><code class="language-python"># file: test.py
+
+def sum(a: int, b: int) -&gt; int:
+ &quot;&quot;&quot;Sum a and b.
+
+ &gt;&gt;&gt; sum(1, 2)
+ 3
+
+ &gt;&gt;&gt; sum(10, 20)
+ 30
+ &quot;&quot;&quot;
+ return a + b
+</code></pre>
+<h2><a class="header" href="#a-hrefhttpsdocspythonorg3librarytimeithtmltimeita" id="a-hrefhttpsdocspythonorg3librarytimeithtmltimeita"><a href="https://docs.python.org/3/library/timeit.html">timeit</a></a></h2>
+<p>Micro benchmarking.</p>
+<pre><code class="language-bash">python -m timeit '[x.strip() for x in [&quot;a &quot;, &quot; b&quot;]]'
+</code></pre>
+
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