* **Argument `'flags=re.DOTALL'` makes `'.'` also accept the `'\n'`.**
* **Use `r'\1'` or `'\\1'` for backreference (`'\1'` returns a character with octal code 1).**
* **Add `'?'` after `'*'` and `'+'` to make them non-greedy.**
* **`'re.compile(<regex>)'` returns a Pattern object with listed methods.**
* **`'re.compile(<regex>)'` returns a Pattern object with listed functions.**
### Match Object
```python
@ -2151,7 +2151,7 @@ with <lock>: # Enters the block by calling acq
<bool> = <Future>.cancel() # Cancels or returns False if running/finished.
<iter> = as_completed(<coll_of_Futures>) # Next() waits for next completed Future.
```
* **Map() and as_completed() also accept 'timeout' argument that causes TimeoutError if result isn't available in 'timeout' seconds after next() is called.**
* **Map() and as\_completed() also accept 'timeout' arg. that causes TimeoutError when next() is called. Map() times from the original call, while as\_completed() from the call to next().**
* **Exceptions that happen inside threads are raised when next() is called on map's iterator or when result() is called on a Future. Its exception() method returns exception or None.**
* **ProcessPoolExecutor provides true parallelism, but everything sent to/from workers must be [pickable](#pickle). Queues must be sent using executor's 'initargs' and 'initializer' parameters.**
@ -2865,7 +2865,7 @@ import wave
<Wave> = wave.open('<path>', 'wb') # Opens WAV file for writing.
<Wave>.setframerate(<int>) # Pass 44100 for CD, 48000 for video.
<Wave>.setnchannels(<int>) # Pass 1 for mono, 2 for stereo.
<Wave>.setsampwidth(<int>) # Pass 1 for 8-bit sound, 2 for CD.
<Wave>.setsampwidth(<int>) # Pass 2 for CD, 3 for hi-res sound.
<Wave>.setparams(<params>) # Sets all parameters.
<Wave>.writeframes(<bytes>) # Appends frames to the file.
<li><strong>Argument <codeclass="python hljs"><spanclass="hljs-string">'flags=re.DOTALL'</span></code> makes <codeclass="python hljs"><spanclass="hljs-string">'.'</span></code> also accept the <codeclass="python hljs"><spanclass="hljs-string">'\n'</span></code>.</strong></li>
<li><strong>Use <codeclass="python hljs"><spanclass="hljs-string">r'\1'</span></code> or <codeclass="python hljs"><spanclass="hljs-string">'\\1'</span></code> for backreference (<codeclass="python hljs"><spanclass="hljs-string">'\1'</span></code> returns a character with octal code 1).</strong></li>
<li><strong>Add <codeclass="python hljs"><spanclass="hljs-string">'?'</span></code> after <codeclass="python hljs"><spanclass="hljs-string">'*'</span></code> and <codeclass="python hljs"><spanclass="hljs-string">'+'</span></code> to make them non-greedy.</strong></li>
<li><strong><codeclass="python hljs"><spanclass="hljs-string">'re.compile(<regex>)'</span></code> returns a Pattern object with listed methods.</strong></li>
<li><strong><codeclass="python hljs"><spanclass="hljs-string">'re.compile(<regex>)'</span></code> returns a Pattern object with listed functions.</strong></li>
</ul>
<div><h3id="matchobject">Match Object</h3><pre><codeclass="python language-python hljs"><str> = <Match>.group() <spanclass="hljs-comment"># Returns the whole match. Also group(0).</span>
<str> = <Match>.group(<spanclass="hljs-number">1</span>) <spanclass="hljs-comment"># Returns part inside the first brackets.</span>
<iter> = as_completed(<coll_of_Futures>) <spanclass="hljs-comment"># Next() waits for next completed Future.</span>
</code></pre>
<ul>
<li><strong>Map() and as_completed() also accept 'timeout' argument that causes TimeoutError if result isn't available in 'timeout' seconds after next() is called.</strong></li>
<li><strong>Map() and as_completed() also accept 'timeout' arg. that causes TimeoutError when next() is called. Map() times from the original call, while as_completed() from the call to next().</strong></li>
<li><strong>Exceptions that happen inside threads are raised when next() is called on map's iterator or when result() is called on a Future. Its exception() method returns exception or None.</strong></li>
<li><strong>ProcessPoolExecutor provides true parallelism, but everything sent to/from workers must be <ahref="#pickle">pickable</a>. Queues must be sent using executor's 'initargs' and 'initializer' parameters.</strong></li>
Jure Šorn
10 months ago