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python-cheatsheet
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Exception, Paths, Image

pull/164/head
Jure Šorn 1 year ago
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9c81a492b5
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2 changed files with 8 additions and 8 deletions
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  1. 6
      README.md
  2. 10
      index.html

6
README.md
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@ -1438,7 +1438,7 @@ filename = <name>.__traceback__.tb_frame.f_code.co_filename
func_name = <name>.__traceback__.tb_frame.f_code.co_name
line = linecache.getline(filename, <name>.__traceback__.tb_lineno)
trace_str = ''.join(traceback.format_tb(<name>.__traceback__))
error_msg = ''.join(traceback.format_exception(exc_type, <name>, <name>.__traceback__))
error_msg = ''.join(traceback.format_exception(type(<name>), <name>, <name>.__traceback__))
```
### Built-in Exceptions
@ -1672,7 +1672,7 @@ from pathlib import Path
```python
<Path> = Path(<path> [, ...]) # Accepts strings, Paths and DirEntry objects.
<Path> = <path> / <path> [/ ...] # First or second path must be a Path object.
<Path> = <Path>.resolve() # Resolves symlinks and calls <Path>.absolute().
<Path> = <Path>.resolve() # Returns absolute path with resolved symlinks.
```
```python
@ -2799,7 +2799,7 @@ img.putdata([(int(h), 255, 255) for h in hues])
img.convert('RGB').save('test.png')
```
#### Adds noise to a PNG image:
#### Adds noise to a PNG image and displays it:
```python
from random import randint
add_noise = lambda value: max(0, min(255, value + randint(-20, 20)))

10
index.html
View File

@ -54,7 +54,7 @@
<body>
<header>
<aside>July 22, 2023</aside>
<aside>July 24, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -1230,7 +1230,7 @@ filename = &lt;name&gt;.__traceback__.tb_frame.f_code.co_filename
func_name = &lt;name&gt;.__traceback__.tb_frame.f_code.co_name
line = linecache.getline(filename, &lt;name&gt;.__traceback__.tb_lineno)
trace_str = <span class="hljs-string">''</span>.join(traceback.format_tb(&lt;name&gt;.__traceback__))
error_msg = <span class="hljs-string">''</span>.join(traceback.format_exception(exc_type, &lt;name&gt;, &lt;name&gt;.__traceback__))
error_msg = <span class="hljs-string">''</span>.join(traceback.format_exception(type(&lt;name&gt;), &lt;name&gt;, &lt;name&gt;.__traceback__))
</code></pre></div>
<div><h3 id="builtinexceptions">Built-in Exceptions</h3><pre><code class="text language-text">BaseException
@ -1414,7 +1414,7 @@ value = args.&lt;name&gt;
<div><h3 id="pathobject">Path Object</h3><pre><code class="python language-python hljs">&lt;Path&gt; = Path(&lt;path&gt; [, ...]) <span class="hljs-comment"># Accepts strings, Paths and DirEntry objects.</span>
&lt;Path&gt; = &lt;path&gt; / &lt;path&gt; [/ ...] <span class="hljs-comment"># First or second path must be a Path object.</span>
&lt;Path&gt; = &lt;Path&gt;.resolve() <span class="hljs-comment"># Resolves symlinks and calls &lt;Path&gt;.absolute().</span>
&lt;Path&gt; = &lt;Path&gt;.resolve() <span class="hljs-comment"># Returns absolute path with resolved symlinks.</span>
</code></pre></div>
<pre><code class="python language-python hljs">&lt;Path&gt; = Path() <span class="hljs-comment"># Returns relative cwd. Also Path('.').</span>
@ -2288,7 +2288,7 @@ img.convert(<span class="hljs-string">'RGB'</span>).save(<span class="hljs-strin
<div><h4 id="addsnoisetoapngimage">Adds noise to a PNG image:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> random <span class="hljs-keyword">import</span> randint
<div><h4 id="addsnoisetoapngimageanddisplaysit">Adds noise to a PNG image and displays it:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> random <span class="hljs-keyword">import</span> randint
add_noise = <span class="hljs-keyword">lambda</span> value: max(<span class="hljs-number">0</span>, min(<span class="hljs-number">255</span>, value + randint(<span class="hljs-number">-20</span>, <span class="hljs-number">20</span>)))
img = Image.open(<span class="hljs-string">'test.png'</span>).convert(<span class="hljs-string">'HSV'</span>)
img.putdata([(add_noise(h), s, v) <span class="hljs-keyword">for</span> h, s, v <span class="hljs-keyword">in</span> img.getdata()])
@ -2933,7 +2933,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>July 22, 2023</aside>
<aside>July 24, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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