Hykilpikonna
204 lines
8.1 KiB
HTML
204 lines
8.1 KiB
HTML
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<header id="title-block-header">
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<h1 class="title">B.4 <code>typing</code></h1>
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</header>
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<section>
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<p><em>Reference: <a href="https://docs.python.org/3.9/library/typing.html" class="uri">https://docs.python.org/3.9/library/typing.html</a>.</em></p>
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<thead>
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<tr class="header">
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<th>Type</th>
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<th>Description</th>
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<tr class="odd">
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<td><code>Any</code></td>
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<td>A value that could be of any type. (Used as a placeholder when a variable’s type could be anything, or is unknown.)</td>
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</tr>
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<tr class="even">
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<td><code>Callable[[T1, T2, ...], Tr]</code></td>
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<td><p>A function whose parameters have type <code>T1</code>, <code>T2</code>, etc., and whose return type is <code>Tr</code>.</p>
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<p>Example: the function</p>
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<div class="sourceCode" id="cb1"><pre class="sourceCode python"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1"></a><span class="kw">def</span> f(x: <span class="bu">int</span>, y: <span class="bu">str</span>) <span class="op">-></span> <span class="bu">bool</span>:</span>
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<span id="cb1-2"><a href="#cb1-2"></a> <span class="co"># Body omitted</span></span></code></pre></div>
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<p>has type <code>Callable[[int, str], bool]</code>.</p></td>
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</tr>
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<tr class="odd">
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<td><code>dict[T1, T2]</code></td>
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<td><p>A dictionary whose keys have type <code>T1</code> and whose values have type <code>T2</code>.</p>
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<p>Example: <code>{'a': 1, 'b': 2}</code> has type <code>dict[str, int]</code>.</p></td>
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<td><code>list[T]</code></td>
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<td><p>A list whose elements all have type <code>T</code>.</p>
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<p>Example: <code>[1, 2, 3]</code> has type <code>list[int]</code>.</p></td>
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</tr>
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<tr class="odd">
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<td><code>Optional[T]</code></td>
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<td>Synonym of <code>Union[T, None]</code>.</td>
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</tr>
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<tr class="even">
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<td><code>set[T]</code></td>
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<td><p>A set whose elements all have type <code>T</code>.</p>
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<p>Example: <code>{'hi', 'bye'}</code> has type <code>set[str]</code>.</p></td>
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</tr>
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<tr class="odd">
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<td><code>tuple[T1, T2, ...]</code></td>
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<td><p>A tuple whose first element has type <code>T1</code>, second element has type <code>T2</code>, etc.</p>
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<p>Example: <code>('hello', True, 3.4)</code> has type <code>tuple[str, bool, float]</code>.</p></td>
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</tr>
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<tr class="even">
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<td><code>Union[T1, T2, ...]</code></td>
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<td><p>A value whose type is one of <code>T1</code>, <code>T2</code>, etc.</p>
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<p>Example: both <code>1</code> and <code>'hello'</code> are instance of type <code>Union[int, str]</code>.</p></td>
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</tr>
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</section>
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<footer>
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<a href="https://www.teach.cs.toronto.edu/~csc110y/fall/notes/">CSC110 Course Notes Home</a>
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