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python-cheatsheet
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CSV, Threading, Curses

pull/164/head
Jure Šorn 1 year ago
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7b7a7b5a37
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3 changed files with 22 additions and 22 deletions
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  1. 16
      README.md
  2. 20
      index.html
  3. 8
      parse.js

16
README.md
View File

@ -1861,16 +1861,16 @@ import csv
### Read Rows from CSV File
```python
def read_csv_file(filename, dialect='excel'):
def read_csv_file(filename, dialect='excel', **params):
with open(filename, encoding='utf-8', newline='') as file:
return list(csv.reader(file, dialect))
return list(csv.reader(file, dialect, **params))
```
### Write Rows to CSV File
```python
def write_to_csv_file(filename, rows, dialect='excel'):
def write_to_csv_file(filename, rows, dialect='excel', **params):
with open(filename, 'w', encoding='utf-8', newline='') as file:
writer = csv.writer(file, dialect)
writer = csv.writer(file, dialect, **params)
writer.writerows(rows)
```
@ -2155,7 +2155,7 @@ with <lock>: # Enters the block by calling acq
```
* **Map() and as_completed() also accept 'timeout' argument that causes TimeoutError if result isn't available in 'timeout' seconds after next() is called.**
* **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.**
* **An object with the same interface called ProcessPoolExecutor provides true parallelism by running a separate interpreter in each process. Arguments/results must be [pickable](#pickle).**
* **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.**
Operator
@ -2423,17 +2423,17 @@ Curses
------
#### Runs a basic file explorer in the terminal:
```python
import curses, curses.ascii, os
import curses, os
from curses import A_REVERSE, KEY_DOWN, KEY_UP, KEY_LEFT, KEY_RIGHT, KEY_ENTER
def main(screen):
ch, first, selected, paths = 0, 0, 0, os.listdir()
while ch != curses.ascii.ESC:
while ch != ord('q'):
height, width = screen.getmaxyx()
screen.erase()
for y, filename in enumerate(paths[first : first+height]):
color = A_REVERSE if filename == paths[selected] else 0
screen.addstr(y, 0, filename[:width-1], color)
screen.addnstr(y, 0, filename, width-1, color)
ch = screen.getch()
selected += (ch == KEY_DOWN) - (ch == KEY_UP)
selected = max(0, min(len(paths)-1, selected))

20
index.html
View File

@ -54,7 +54,7 @@
<body>
<header>
<aside>July 24, 2023</aside>
<aside>July 27, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -1553,14 +1553,14 @@ CompletedProcess(args=[<span class="hljs-string">'bc'</span>, <span class="hljs-
<div><h3 id="readrowsfromcsvfile">Read Rows from CSV File</h3><pre><code class="python language-python hljs"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">read_csv_file</span><span class="hljs-params">(filename, dialect=<span class="hljs-string">'excel'</span>)</span>:</span>
<div><h3 id="readrowsfromcsvfile">Read Rows from CSV File</h3><pre><code class="python language-python hljs"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">read_csv_file</span><span class="hljs-params">(filename, dialect=<span class="hljs-string">'excel'</span>, **params)</span>:</span>
<span class="hljs-keyword">with</span> open(filename, encoding=<span class="hljs-string">'utf-8'</span>, newline=<span class="hljs-string">''</span>) <span class="hljs-keyword">as</span> file:
<span class="hljs-keyword">return</span> list(csv.reader(file, dialect))
<span class="hljs-keyword">return</span> list(csv.reader(file, dialect, **params))
</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>)</span>:</span>
<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:
writer = csv.writer(file, dialect)
writer = csv.writer(file, dialect, **params)
writer.writerows(rows)
</code></pre></div>
@ -1783,7 +1783,7 @@ CompletedProcess(args=[<span class="hljs-string">'bc'</span>, <span class="hljs-
<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>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>An object with the same interface called ProcessPoolExecutor provides true parallelism by running a separate interpreter in each process. Arguments/results must be <a href="#pickle">pickable</a>.</strong></li>
<li><strong>ProcessPoolExecutor provides true parallelism, but everything sent to/from workers must be <a href="#pickle">pickable</a>. Queues must be sent using executor's 'initargs' and 'initializer' parameters.</strong></li>
</ul>
<div><h2 id="operator"><a href="#operator" name="operator">#</a>Operator</h2><p><strong>Module of functions that provide the functionality of operators.</strong></p><pre><code class="python language-python hljs"><span class="hljs-keyword">import</span> operator <span class="hljs-keyword">as</span> op
&lt;obj&gt; = op.add/sub/mul/truediv/floordiv/mod(&lt;obj&gt;, &lt;obj&gt;) <span class="hljs-comment"># +, -, *, /, //, %</span>
@ -1986,17 +1986,17 @@ print(table)
</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, curses.ascii, os
<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
<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>
ch, first, selected, paths = <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, os.listdir()
<span class="hljs-keyword">while</span> ch != curses.ascii.ESC:
<span class="hljs-keyword">while</span> ch != ord(<span class="hljs-string">'q'</span>):
height, width = screen.getmaxyx()
screen.erase()
<span class="hljs-keyword">for</span> y, filename <span class="hljs-keyword">in</span> enumerate(paths[first : first+height]):
color = A_REVERSE <span class="hljs-keyword">if</span> filename == paths[selected] <span class="hljs-keyword">else</span> <span class="hljs-number">0</span>
screen.addstr(y, <span class="hljs-number">0</span>, filename[:width-<span class="hljs-number">1</span>], color)
screen.addnstr(y, <span class="hljs-number">0</span>, filename, width-<span class="hljs-number">1</span>, color)
ch = screen.getch()
selected += (ch == KEY_DOWN) - (ch == KEY_UP)
selected = max(<span class="hljs-number">0</span>, min(len(paths)-<span class="hljs-number">1</span>, selected))
@ -2933,7 +2933,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>July 24, 2023</aside>
<aside>July 27, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

8
parse.js
View File

@ -164,17 +164,17 @@ const COROUTINES =
' curses.wrapper(main)\n';
const CURSES =
'<span class="hljs-keyword">import</span> curses, curses.ascii, os\n' +
'<span class="hljs-keyword">import</span> curses, os\n' +
'<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\n' +
'\n' +
'<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">main</span><span class="hljs-params">(screen)</span>:</span>\n' +
' ch, first, selected, paths = <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, os.listdir()\n' +
' <span class="hljs-keyword">while</span> ch != curses.ascii.ESC:\n' +
' <span class="hljs-keyword">while</span> ch != ord(<span class="hljs-string">\'q\'</span>):\n' +
' height, width = screen.getmaxyx()\n' +
' screen.erase()\n' +
' <span class="hljs-keyword">for</span> y, filename <span class="hljs-keyword">in</span> enumerate(paths[first : first+height]):\n' +
' color = A_REVERSE <span class="hljs-keyword">if</span> filename == paths[selected] <span class="hljs-keyword">else</span> <span class="hljs-number">0</span>\n' +
' screen.addstr(y, <span class="hljs-number">0</span>, filename[:width-<span class="hljs-number">1</span>], color)\n' +
' screen.addnstr(y, <span class="hljs-number">0</span>, filename, width-<span class="hljs-number">1</span>, color)\n' +
' ch = screen.getch()\n' +
' selected += (ch == KEY_DOWN) - (ch == KEY_UP)\n' +
' selected = max(<span class="hljs-number">0</span>, min(len(paths)-<span class="hljs-number">1</span>, selected))\n' +
@ -811,7 +811,7 @@ function fixHighlights() {
$(`code:contains(\'<class_name>\', <tuple_of_parents>, <dict_of_class_attributes>)`).html(TYPE);
$(`code:contains(ValueError: malformed node)`).html(EVAL);
$(`code:contains(import asyncio, collections, curses, curses.textpad, enum, random)`).html(COROUTINES);
$(`code:contains(import curses, curses.ascii, os)`).html(CURSES);
$(`code:contains(import curses, os)`).html(CURSES);
$(`code:contains(pip3 install tqdm)`).html(PROGRESS_BAR);
$(`code:contains(>>> logging.basicConfig(level=)`).html(LOGGING_EXAMPLE);
$(`code:contains(samples_f = (sin(i *)`).html(AUDIO);

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