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python-cheatsheet
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Fixed Logger and updated Scraping

pull/167/head
Jure Šorn 1 year ago
parent
feb0342c98
commit
9614199761
3 changed files with 28 additions and 26 deletions
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  1. 23
      README.md
  2. 26
      index.html
  3. 5
      parse.js

23
README.md
View File

@ -2456,7 +2456,7 @@ import logging
logging.basicConfig(filename=<path>) # Configures the root logger (see Setup).
logging.debug/info/warning/error/critical(<str>) # Logs to the root logger.
<Logger> = logging.getLogger(__name__) # Logger named after the module.
<Logger>.<level>(<str>) # Messages propagate to the root logger.
<Logger>.<level>(<str>) # Logs to the logger.
<Logger>.exception(<str>) # Calls error() with caught exception.
```
@ -2476,20 +2476,23 @@ logging.basicConfig(
<Handler>.setFormatter(<Formatter>) # Adds Formatter to the Handler.
<Handler>.setLevel(<int/str>) # Processes all messages by default.
<Logger>.addHandler(<Handler>) # Adds Handler to the Logger.
<Logger>.setLevel(<int/str>) # What is sent to handlers and parent.
<Logger>.setLevel(<int/str>) # What is sent to its/ancestor's handlers.
```
* **Parent logger can be specified by naming the child logger `'<parent>.<name>'`.**
* **If logger doesn't have a set level it inherits it from the first ancestor that does.**
* **Formatter also supports: pathname, filename, funcName, lineno, thread and process.**
* **A `'handlers.RotatingFileHandler'` creates and deletes log files based on 'maxBytes' and 'backupCount' arguments.**
#### Creates a logger that writes all messages to a file and sends them to the root logger that prints to stderr:
#### Creates a logger that writes all messages to file and sends them to the root's handler that prints warnings or higher:
```python
>>> logging.basicConfig(level='WARNING')
>>> logger = logging.getLogger('my_module')
>>> handler = logging.FileHandler('test.log')
>>> formatter = logging.Formatter('%(asctime)s %(levelname)s:%(name)s:%(message)s')
>>> handler.setFormatter(formatter)
>>> logger.addHandler(handler)
>>> handler.setFormatter(formatter)
>>> logging.basicConfig(level='DEBUG')
>>> logging.root.handlers[0].setLevel('WARNING')
>>> logger.critical('Running out of disk space.')
CRITICAL:my_module:Running out of disk space.
>>> print(open('test.log').read())
@ -2499,24 +2502,22 @@ CRITICAL:my_module:Running out of disk space.
Scraping
--------
#### Scrapes Python's URL, version number and logo from its Wikipedia page:
#### Scrapes Python's URL and logo from its Wikipedia page:
```python
# $ pip3 install requests beautifulsoup4
import requests, bs4, os, sys
WIKI_URL = 'https://en.wikipedia.org/wiki/Python_(programming_language)'
try:
html = requests.get(WIKI_URL).text
document = bs4.BeautifulSoup(html, 'html.parser')
response = requests.get('https://en.wikipedia.org/wiki/Python_(programming_language)')
document = bs4.BeautifulSoup(response.text, 'html.parser')
table = document.find('table', class_='infobox vevent')
python_url = table.find('th', text='Website').next_sibling.a['href']
version = table.find('th', text='Stable release').next_sibling.strings.__next__()
logo_url = table.find('img')['src']
logo = requests.get(f'https:{logo_url}').content
filename = os.path.basename(logo_url)
with open(filename, 'wb') as file:
file.write(logo)
print(f'{python_url}, {version}, file://{os.path.abspath(filename)}')
print(f'{python_url}, file://{os.path.abspath(filename)}')
except requests.exceptions.ConnectionError:
print("You've got problems with connection.", file=sys.stderr)
```

26
index.html
View File

@ -54,7 +54,7 @@
<body>
<header>
<aside>September 17, 2023</aside>
<aside>September 18, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -2015,7 +2015,7 @@ print(table)
<pre><code class="python language-python hljs">logging.basicConfig(filename=&lt;path&gt;) <span class="hljs-comment"># Configures the root logger (see Setup).</span>
logging.debug/info/warning/error/critical(&lt;str&gt;) <span class="hljs-comment"># Logs to the root logger.</span>
&lt;Logger&gt; = logging.getLogger(__name__) <span class="hljs-comment"># Logger named after the module.</span>
&lt;Logger&gt;.&lt;level&gt;(&lt;str&gt;) <span class="hljs-comment"># Messages propagate to the root logger.</span>
&lt;Logger&gt;.&lt;level&gt;(&lt;str&gt;) <span class="hljs-comment"># Logs to the logger.</span>
&lt;Logger&gt;.exception(&lt;str&gt;) <span class="hljs-comment"># Calls error() with caught exception.</span>
</code></pre>
<div><h3 id="setup">Setup</h3><pre><code class="python language-python hljs">logging.basicConfig(
@ -2031,41 +2031,41 @@ logging.debug/info/warning/error/critical(&lt;str&gt;) <span class="hljs-commen
&lt;Handler&gt;.setFormatter(&lt;Formatter&gt;) <span class="hljs-comment"># Adds Formatter to the Handler.</span>
&lt;Handler&gt;.setLevel(&lt;int/str&gt;) <span class="hljs-comment"># Processes all messages by default.</span>
&lt;Logger&gt;.addHandler(&lt;Handler&gt;) <span class="hljs-comment"># Adds Handler to the Logger.</span>
&lt;Logger&gt;.setLevel(&lt;int/str&gt;) <span class="hljs-comment"># What is sent to handlers and parent.</span>
&lt;Logger&gt;.setLevel(&lt;int/str&gt;) <span class="hljs-comment"># What is sent to its/ancestor's handlers.</span>
</code></pre>
<ul>
<li><strong>Parent logger can be specified by naming the child logger <code class="python hljs"><span class="hljs-string">'&lt;parent&gt;.&lt;name&gt;'</span></code>.</strong></li>
<li><strong>If logger doesn't have a set level it inherits it from the first ancestor that does.</strong></li>
<li><strong>Formatter also supports: pathname, filename, funcName, lineno, thread and process.</strong></li>
<li><strong>A <code class="python hljs"><span class="hljs-string">'handlers.RotatingFileHandler'</span></code> creates and deletes log files based on 'maxBytes' and 'backupCount' arguments.</strong></li>
</ul>
<div><h4 id="createsaloggerthatwritesallmessagestoafileandsendsthemtotherootloggerthatprintstostderr">Creates a logger that writes all messages to a file and sends them to the root logger that prints to stderr:</h4><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>logging.basicConfig(level=<span class="hljs-string">'WARNING'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>logger = logging.getLogger(<span class="hljs-string">'my_module'</span>)
<div><h4 id="createsaloggerthatwritesallmessagestofileandsendsthemtotherootshandlerthatprintswarningsorhigher">Creates a logger that writes all messages to file and sends them to the root's handler that prints warnings or higher:</h4><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>logger = logging.getLogger(<span class="hljs-string">'my_module'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>handler = logging.FileHandler(<span class="hljs-string">'test.log'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>formatter = logging.Formatter(<span class="hljs-string">'%(asctime)s %(levelname)s:%(name)s:%(message)s'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>handler.setFormatter(formatter)
<span class="hljs-meta">&gt;&gt;&gt; </span>logger.addHandler(handler)
<span class="hljs-meta">&gt;&gt;&gt; </span>handler.setFormatter(formatter)
<span class="hljs-meta">&gt;&gt;&gt; </span>logging.basicConfig(level=<span class="hljs-string">'DEBUG'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>logging.root.handlers[<span class="hljs-number">0</span>].setLevel(<span class="hljs-string">'WARNING'</span>)
<span class="hljs-meta">&gt;&gt;&gt; </span>logger.critical(<span class="hljs-string">'Running out of disk space.'</span>)
CRITICAL:my_module:Running out of disk space.
<span class="hljs-meta">&gt;&gt;&gt; </span>print(open(<span class="hljs-string">'test.log'</span>).read())
2023-02-07 23:21:01,430 CRITICAL:my_module:Running out of disk space.
</code></pre></div>
<div><h2 id="scraping"><a href="#scraping" name="scraping">#</a>Scraping</h2><div><h4 id="scrapespythonsurlversionnumberandlogofromitswikipediapage">Scrapes Python's URL, version number and logo from its Wikipedia page:</h4><pre><code class="python language-python hljs"><span class="hljs-comment"># $ pip3 install requests beautifulsoup4</span>
<div><h2 id="scraping"><a href="#scraping" name="scraping">#</a>Scraping</h2><div><h4 id="scrapespythonsurlandlogofromitswikipediapage">Scrapes Python's URL and logo from its Wikipedia page:</h4><pre><code class="python language-python hljs"><span class="hljs-comment"># $ pip3 install requests beautifulsoup4</span>
<span class="hljs-keyword">import</span> requests, bs4, os, sys
WIKI_URL = <span class="hljs-string">'https://en.wikipedia.org/wiki/Python_(programming_language)'</span>
<span class="hljs-keyword">try</span>:
html = requests.get(WIKI_URL).text
document = bs4.BeautifulSoup(html, <span class="hljs-string">'html.parser'</span>)
response = requests.get(<span class="hljs-string">'https://en.wikipedia.org/wiki/Python_(programming_language)'</span>)
document = bs4.BeautifulSoup(response.text, <span class="hljs-string">'html.parser'</span>)
table = document.find(<span class="hljs-string">'table'</span>, class_=<span class="hljs-string">'infobox vevent'</span>)
python_url = table.find(<span class="hljs-string">'th'</span>, text=<span class="hljs-string">'Website'</span>).next_sibling.a[<span class="hljs-string">'href'</span>]
version = table.find(<span class="hljs-string">'th'</span>, text=<span class="hljs-string">'Stable release'</span>).next_sibling.strings.__next__()
logo_url = table.find(<span class="hljs-string">'img'</span>)[<span class="hljs-string">'src'</span>]
logo = requests.get(<span class="hljs-string">f'https:<span class="hljs-subst">{logo_url}</span>'</span>).content
filename = os.path.basename(logo_url)
<span class="hljs-keyword">with</span> open(filename, <span class="hljs-string">'wb'</span>) <span class="hljs-keyword">as</span> file:
file.write(logo)
print(<span class="hljs-string">f'<span class="hljs-subst">{python_url}</span>, <span class="hljs-subst">{version}</span>, file://<span class="hljs-subst">{os.path.abspath(filename)}</span>'</span>)
print(<span class="hljs-string">f'<span class="hljs-subst">{python_url}</span>, file://<span class="hljs-subst">{os.path.abspath(filename)}</span>'</span>)
<span class="hljs-keyword">except</span> requests.exceptions.ConnectionError:
print(<span class="hljs-string">"You've got problems with connection."</span>, file=sys.stderr)
</code></pre></div></div>
@ -2929,7 +2929,7 @@ $ deactivate <span class="hljs-comment"># Deactivates the activ
<footer>
<aside>September 17, 2023</aside>
<aside>September 18, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

5
parse.js
View File

@ -203,12 +203,13 @@ const PROGRESS_BAR =
'Processing: 100%|████████████████████| 3/3 [00:03&lt;00:00, 1.00s/it]\n';
const LOGGING_EXAMPLE =
'<span class="hljs-meta">&gt;&gt;&gt; </span>logging.basicConfig(level=<span class="hljs-string">\'WARNING\'</span>)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>logger = logging.getLogger(<span class="hljs-string">\'my_module\'</span>)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>handler = logging.FileHandler(<span class="hljs-string">\'test.log\'</span>)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>formatter = logging.Formatter(<span class="hljs-string">\'%(asctime)s %(levelname)s:%(name)s:%(message)s\'</span>)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>handler.setFormatter(formatter)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>logger.addHandler(handler)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>handler.setFormatter(formatter)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>logging.basicConfig(level=<span class="hljs-string">\'DEBUG\'</span>)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>logging.root.handlers[<span class="hljs-number">0</span>].setLevel(<span class="hljs-string">\'WARNING\'</span>)\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>logger.critical(<span class="hljs-string">\'Running out of disk space.\'</span>)\n' +
'CRITICAL:my_module:Running out of disk space.\n' +
'<span class="hljs-meta">&gt;&gt;&gt; </span>print(open(<span class="hljs-string">\'test.log\'</span>).read())\n' +

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