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python-cheatsheet
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pull/170/head
Jure Šorn 1 year ago
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2 changed files with 18 additions and 18 deletions
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  1. 20
      README.md
  2. 16
      index.html

20
README.md
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@ -1870,8 +1870,8 @@ def read_csv_file(filename, dialect='excel', **params):
### Write Rows to CSV File ### Write Rows to CSV File
```python ```python
def write_to_csv_file(filename, rows, dialect='excel', **params):
with open(filename, 'w', encoding='utf-8', newline='') as file:
def write_to_csv_file(filename, rows, mode='w', dialect='excel', **params):
with open(filename, mode, encoding='utf-8', newline='') as file:
writer = csv.writer(file, dialect, **params) writer = csv.writer(file, dialect, **params)
writer.writerows(rows) writer.writerows(rows)
``` ```
@ -2383,10 +2383,9 @@ Progress Bar
------------ ------------
```python ```python
# $ pip3 install tqdm # $ pip3 install tqdm
>>> from tqdm import tqdm
>>> from time import sleep
>>> for el in tqdm([1, 2, 3], desc='Processing'):
... sleep(1)
>>> import tqdm, time
>>> for el in tqdm.tqdm([1, 2, 3], desc='Processing'):
... time.sleep(1)
Processing: 100%|████████████████████| 3/3 [00:03<00:00, 1.00s/it] Processing: 100%|████████████████████| 3/3 [00:03<00:00, 1.00s/it]
``` ```
@ -2420,8 +2419,9 @@ print(table)
Curses Curses
------ ------
#### Runs a basic file explorer in the terminal:
#### Runs a basic file explorer in the console:
```python ```python
# pip3 install windows-curses
import curses, os import curses, os
from curses import A_REVERSE, KEY_DOWN, KEY_UP, KEY_LEFT, KEY_RIGHT, KEY_ENTER from curses import A_REVERSE, KEY_DOWN, KEY_UP, KEY_LEFT, KEY_RIGHT, KEY_ENTER
@ -2619,7 +2619,7 @@ Line # Hits Time Per Hit % Time Line Contents
$ pip3 install gprof2dot snakeviz; apt/brew install graphviz $ pip3 install gprof2dot snakeviz; apt/brew install graphviz
$ tail -n 4 test.py > test.py $ tail -n 4 test.py > test.py
$ python3 -m cProfile -o test.prof test.py $ python3 -m cProfile -o test.prof test.py
$ gprof2dot -f pstats test.prof | dot -Tpng -o test.png; xdg-open/open test.png
$ gprof2dot -f pstats test.prof | dot -T png -o test.png; xdg-open/open test.png
$ snakeviz test.prof $ snakeviz test.prof
``` ```
@ -2778,7 +2778,7 @@ from PIL import Image, ImageFilter, ImageEnhance
``` ```
```python ```python
<array> = np.array(<Image>) # Creates NumPy array from the image.
<array> = np.array(<Image>) # Creates a NumPy array from the image.
<Image> = Image.fromarray(np.uint8(<array>)) # Use <array>.clip(0, 255) to clip values. <Image> = Image.fromarray(np.uint8(<array>)) # Use <array>.clip(0, 255) to clip values.
``` ```
@ -3240,7 +3240,7 @@ b 3 4
```python ```python
<Sr/DF> = <DF>[column_key/s] # Or: <DF>.column_key <Sr/DF> = <DF>[column_key/s] # Or: <DF>.column_key
<DF> = <DF>[row_bools] # Keeps rows as specified by bools. <DF> = <DF>[row_bools] # Keeps rows as specified by bools.
<DF> = <DF>[<DF_of_bools>] # Assigns NaN to values that are False in bools.
<DF> = <DF>[<DF_of_bools>] # Assigns NaN to items that are False in bools.
``` ```
```python ```python

16
index.html
View File

@ -54,7 +54,7 @@
<body> <body>
<header> <header>
<aside>October 11, 2023</aside>
<aside>October 16, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a> <a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header> </header>
@ -1553,8 +1553,8 @@ CompletedProcess(args=[<span class="hljs-string">'bc'</span>, <span class="hljs-
<span class="hljs-keyword">return</span> list(csv.reader(file, dialect, **params)) <span class="hljs-keyword">return</span> list(csv.reader(file, dialect, **params))
</code></pre></div> </code></pre></div>
<div><h3 id="writerowstocsvfile">Write Rows to CSV File</h3><pre><code class="python language-python hljs"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">write_to_csv_file</span><span class="hljs-params">(filename, rows, dialect=<span class="hljs-string">'excel'</span>, **params)</span>:</span>
<span class="hljs-keyword">with</span> open(filename, <span class="hljs-string">'w'</span>, encoding=<span class="hljs-string">'utf-8'</span>, newline=<span class="hljs-string">''</span>) <span class="hljs-keyword">as</span> file:
<div><h3 id="writerowstocsvfile">Write Rows to CSV File</h3><pre><code class="python language-python hljs"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">write_to_csv_file</span><span class="hljs-params">(filename, rows, mode=<span class="hljs-string">'w'</span>, dialect=<span class="hljs-string">'excel'</span>, **params)</span>:</span>
<span class="hljs-keyword">with</span> open(filename, mode, encoding=<span class="hljs-string">'utf-8'</span>, newline=<span class="hljs-string">''</span>) <span class="hljs-keyword">as</span> file:
writer = csv.writer(file, dialect, **params) writer = csv.writer(file, dialect, **params)
writer.writerows(rows) writer.writerows(rows)
</code></pre></div> </code></pre></div>
@ -1979,7 +1979,7 @@ print(table)
</code></pre></div></div> </code></pre></div></div>
<div><h2 id="curses"><a href="#curses" name="curses">#</a>Curses</h2><div><h4 id="runsabasicfileexplorerintheterminal">Runs a basic file explorer in the terminal:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">import</span> curses, os
<div><h2 id="curses"><a href="#curses" name="curses">#</a>Curses</h2><div><h4 id="runsabasicfileexplorerintheconsole">Runs a basic file explorer in the console:</h4><pre><code class="python language-python hljs"><span class="hljs-keyword">import</span> curses, os
<span class="hljs-keyword">from</span> curses <span class="hljs-keyword">import</span> A_REVERSE, KEY_DOWN, KEY_UP, KEY_LEFT, KEY_RIGHT, KEY_ENTER <span class="hljs-keyword">from</span> curses <span class="hljs-keyword">import</span> A_REVERSE, KEY_DOWN, KEY_UP, KEY_LEFT, KEY_RIGHT, KEY_ENTER
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">main</span><span class="hljs-params">(screen)</span>:</span> <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">main</span><span class="hljs-params">(screen)</span>:</span>
@ -2141,7 +2141,7 @@ Line # Hits Time Per Hit % Time Line Contents
<div><h3 id="callandflamegraphs">Call and Flame Graphs</h3><pre><code class="text language-text">$ pip3 install gprof2dot snakeviz; apt/brew install graphviz <div><h3 id="callandflamegraphs">Call and Flame Graphs</h3><pre><code class="text language-text">$ pip3 install gprof2dot snakeviz; apt/brew install graphviz
$ tail -n 4 test.py &gt; test.py $ tail -n 4 test.py &gt; test.py
$ python3 -m cProfile -o test.prof test.py $ python3 -m cProfile -o test.prof test.py
$ gprof2dot -f pstats test.prof | dot -Tpng -o test.png; xdg-open/open test.png
$ gprof2dot -f pstats test.prof | dot -T png -o test.png; xdg-open/open test.png
$ snakeviz test.prof $ snakeviz test.prof
</code></pre></div> </code></pre></div>
@ -2262,7 +2262,7 @@ right = [[<span class="hljs-number">0.1</span>, <span class="hljs-number">0.6</
<pre><code class="python language-python hljs">&lt;Image&gt; = &lt;Image&gt;.filter(&lt;Filter&gt;) <span class="hljs-comment"># `&lt;Filter&gt; = ImageFilter.&lt;name&gt;([&lt;args&gt;])`</span> <pre><code class="python language-python hljs">&lt;Image&gt; = &lt;Image&gt;.filter(&lt;Filter&gt;) <span class="hljs-comment"># `&lt;Filter&gt; = ImageFilter.&lt;name&gt;([&lt;args&gt;])`</span>
&lt;Image&gt; = &lt;Enhance&gt;.enhance(&lt;float&gt;) <span class="hljs-comment"># `&lt;Enhance&gt; = ImageEnhance.&lt;name&gt;(&lt;Image&gt;)`</span> &lt;Image&gt; = &lt;Enhance&gt;.enhance(&lt;float&gt;) <span class="hljs-comment"># `&lt;Enhance&gt; = ImageEnhance.&lt;name&gt;(&lt;Image&gt;)`</span>
</code></pre> </code></pre>
<pre><code class="python language-python hljs">&lt;array&gt; = np.array(&lt;Image&gt;) <span class="hljs-comment"># Creates NumPy array from the image.</span>
<pre><code class="python language-python hljs">&lt;array&gt; = np.array(&lt;Image&gt;) <span class="hljs-comment"># Creates a NumPy array from the image.</span>
&lt;Image&gt; = Image.fromarray(np.uint8(&lt;array&gt;)) <span class="hljs-comment"># Use &lt;array&gt;.clip(0, 255) to clip values.</span> &lt;Image&gt; = Image.fromarray(np.uint8(&lt;array&gt;)) <span class="hljs-comment"># Use &lt;array&gt;.clip(0, 255) to clip values.</span>
</code></pre> </code></pre>
<div><h3 id="modes-1">Modes</h3><ul> <div><h3 id="modes-1">Modes</h3><ul>
@ -2638,7 +2638,7 @@ b <span class="hljs-number">3</span> <span class="hljs-number">4</span>
</code></pre> </code></pre>
<pre><code class="python language-python hljs">&lt;Sr/DF&gt; = &lt;DF&gt;[column_key/s] <span class="hljs-comment"># Or: &lt;DF&gt;.column_key</span> <pre><code class="python language-python hljs">&lt;Sr/DF&gt; = &lt;DF&gt;[column_key/s] <span class="hljs-comment"># Or: &lt;DF&gt;.column_key</span>
&lt;DF&gt; = &lt;DF&gt;[row_bools] <span class="hljs-comment"># Keeps rows as specified by bools.</span> &lt;DF&gt; = &lt;DF&gt;[row_bools] <span class="hljs-comment"># Keeps rows as specified by bools.</span>
&lt;DF&gt; = &lt;DF&gt;[&lt;DF_of_bools&gt;] <span class="hljs-comment"># Assigns NaN to values that are False in bools.</span>
&lt;DF&gt; = &lt;DF&gt;[&lt;DF_of_bools&gt;] <span class="hljs-comment"># Assigns NaN to items that are False in bools.</span>
</code></pre> </code></pre>
<pre><code class="python language-python hljs">&lt;DF&gt; = &lt;DF&gt; &gt; &lt;el/Sr/DF&gt; <span class="hljs-comment"># Returns DF of bools. Sr is treated as a row.</span> <pre><code class="python language-python hljs">&lt;DF&gt; = &lt;DF&gt; &gt; &lt;el/Sr/DF&gt; <span class="hljs-comment"># Returns DF of bools. Sr is treated as a row.</span>
&lt;DF&gt; = &lt;DF&gt; + &lt;el/Sr/DF&gt; <span class="hljs-comment"># Items with non-matching keys get value NaN.</span> &lt;DF&gt; = &lt;DF&gt; + &lt;el/Sr/DF&gt; <span class="hljs-comment"># Items with non-matching keys get value NaN.</span>
@ -2925,7 +2925,7 @@ $ deactivate <span class="hljs-comment"># Deactivates the activ
<footer> <footer>
<aside>October 11, 2023</aside>
<aside>October 16, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a> <a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer> </footer>

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