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python-cheatsheet
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Arguments, Profile, Animation, Synthesizer

pull/95/head
Jure Šorn 4 years ago
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f51e8307ac
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eca5914254
2 changed files with 16 additions and 16 deletions
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  1. 16
      README.md
  2. 16
      index.html

16
README.md
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@ -1496,8 +1496,8 @@ Command Line Arguments
----------------------
```python
import sys
script_name = sys.argv[0]
arguments = sys.argv[1:]
scripts_path = sys.argv[0]
arguments = sys.argv[1:]
```
### Argument Parser
@ -2541,7 +2541,7 @@ duration = perf_counter() - start_time
### Timing a Snippet
```python
>>> from timeit import timeit
>>> timeit('"-".join(str(i) for i in range(100))',
>>> timeit('"".join(str(i) for i in range(100))',
... number=10000, globals=globals(), setup='pass')
0.34986
```
@ -2776,8 +2776,8 @@ from PIL import Image, ImageDraw
import imageio
WIDTH, R = 126, 10
frames = []
for velocity in range(15):
y = sum(range(velocity+1))
for velocity in range(1, 16):
y = sum(range(velocity))
frame = Image.new('L', (WIDTH, WIDTH))
draw = ImageDraw.Draw(frame)
draw.ellipse((WIDTH/2-R, y, WIDTH/2+R, y+R*2), fill='white')
@ -2901,13 +2901,13 @@ Synthesizer
import simpleaudio, math, struct
from itertools import chain, repeat
F = 44100
P1 = '71♪,69,,71♪,66,,62♪,66,,59♪,,,'
P2 = '71♪,73,,74♪,73,,74,,71,,73♪,71,,73,,69,,71♪,69,,71,,67,,71♪,,,'
P1 = '71♩,69♪,,71♩,66♪,,62♩,66♪,,59♩,,,'
P2 = '71♩,73♪,,74♩,73♪,,74♪,,71♪,,73♩,71♪,,73♪,,69♪,,71♩,69♪,,71♪,,67♪,,71♩,,,'
get_pause = lambda seconds: repeat(0, int(seconds * F))
sin_f = lambda i, hz: math.sin(i * 2 * math.pi * hz / F)
get_wave = lambda hz, seconds: (sin_f(i, hz) for i in range(int(seconds * F)))
get_hz = lambda key: 8.176 * 2 ** (int(key) / 12)
parse_note = lambda note: (get_hz(note[:2]), 0.25 if '♪' in note else 0.125)
parse_note = lambda note: (get_hz(note[:2]), 0.125 if '♪' in note else 0.25)
get_samples = lambda note: get_wave(*parse_note(note)) if note else get_pause(0.125)
samples_f = chain.from_iterable(get_samples(n) for n in f'{P1}{P1}{P2}'.split(','))
samples_b = b''.join(struct.pack('<h', int(f * 30000)) for f in samples_f)

16
index.html
View File

@ -1419,8 +1419,8 @@ pprint(&lt;collection&gt;, width=<span class="hljs-number">80</span>, depth=<spa
<li><strong>Raises EOFError when user hits EOF (ctrl-d/z) or input stream gets exhausted.</strong></li>
</ul>
<div><h2 id="commandlinearguments"><a href="#commandlinearguments" name="commandlinearguments">#</a>Command Line Arguments</h2><pre><code class="python language-python hljs"><span class="hljs-keyword">import</span> sys
script_name = sys.argv[<span class="hljs-number">0</span>]
arguments = sys.argv[<span class="hljs-number">1</span>:]
scripts_path = sys.argv[<span class="hljs-number">0</span>]
arguments = sys.argv[<span class="hljs-number">1</span>:]
</code></pre></div>
<div><h3 id="argumentparser">Argument Parser</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> argparse <span class="hljs-keyword">import</span> ArgumentParser, FileType
@ -2213,7 +2213,7 @@ duration = perf_counter() - start_time
</code></pre></div>
<div><h3 id="timingasnippet">Timing a Snippet</h3><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span><span class="hljs-keyword">from</span> timeit <span class="hljs-keyword">import</span> timeit
<span class="hljs-meta">&gt;&gt;&gt; </span>timeit(<span class="hljs-string">'"-".join(str(i) for i in range(100))'</span>,
<span class="hljs-meta">&gt;&gt;&gt; </span>timeit(<span class="hljs-string">'"".join(str(i) for i in range(100))'</span>,
<span class="hljs-meta">... </span> number=<span class="hljs-number">10000</span>, globals=globals(), setup=<span class="hljs-string">'pass'</span>)
<span class="hljs-number">0.34986</span>
</code></pre></div>
@ -2393,8 +2393,8 @@ img.convert(<span class="hljs-string">'RGB'</span>).save(<span class="hljs-strin
<span class="hljs-keyword">import</span> imageio
WIDTH, R = <span class="hljs-number">126</span>, <span class="hljs-number">10</span>
frames = []
<span class="hljs-keyword">for</span> velocity <span class="hljs-keyword">in</span> range(<span class="hljs-number">15</span>):
y = sum(range(velocity+<span class="hljs-number">1</span>))
<span class="hljs-keyword">for</span> velocity <span class="hljs-keyword">in</span> range(<span class="hljs-number">1</span>, <span class="hljs-number">16</span>):
y = sum(range(velocity))
frame = Image.new(<span class="hljs-string">'L'</span>, (WIDTH, WIDTH))
draw = ImageDraw.Draw(frame)
draw.ellipse((WIDTH/<span class="hljs-number">2</span>-R, y, WIDTH/<span class="hljs-number">2</span>+R, y+R*<span class="hljs-number">2</span>), fill=<span class="hljs-string">'white'</span>)
@ -2494,13 +2494,13 @@ engine.runAndWait()
<span class="hljs-keyword">import</span> simpleaudio, math, struct
<span class="hljs-keyword">from</span> itertools <span class="hljs-keyword">import</span> chain, repeat
F = <span class="hljs-number">44100</span>
P1 = <span class="hljs-string">'71♪,69,,71♪,66,,62♪,66,,59♪,,,'</span>
P2 = <span class="hljs-string">'71♪,73,,74♪,73,,74,,71,,73♪,71,,73,,69,,71♪,69,,71,,67,,71♪,,,'</span>
P1 = <span class="hljs-string">'71♩,69♪,,71♩,66♪,,62♩,66♪,,59♩,,,'</span>
P2 = <span class="hljs-string">'71♩,73♪,,74♩,73♪,,74♪,,71♪,,73♩,71♪,,73♪,,69♪,,71♩,69♪,,71♪,,67♪,,71♩,,,'</span>
get_pause = <span class="hljs-keyword">lambda</span> seconds: repeat(<span class="hljs-number">0</span>, int(seconds * F))
sin_f = <span class="hljs-keyword">lambda</span> i, hz: math.sin(i * <span class="hljs-number">2</span> * math.pi * hz / F)
get_wave = <span class="hljs-keyword">lambda</span> hz, seconds: (sin_f(i, hz) <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> range(int(seconds * F)))
get_hz = <span class="hljs-keyword">lambda</span> key: <span class="hljs-number">8.176</span> * <span class="hljs-number">2</span> ** (int(key) / <span class="hljs-number">12</span>)
parse_note = <span class="hljs-keyword">lambda</span> note: (get_hz(note[:<span class="hljs-number">2</span>]), <span class="hljs-number">0.25</span> <span class="hljs-keyword">if</span> <span class="hljs-string">'♪'</span> <span class="hljs-keyword">in</span> note <span class="hljs-keyword">else</span> <span class="hljs-number">0.125</span>)
parse_note = <span class="hljs-keyword">lambda</span> note: (get_hz(note[:<span class="hljs-number">2</span>]), <span class="hljs-number">0.125</span> <span class="hljs-keyword">if</span> <span class="hljs-string">'♪'</span> <span class="hljs-keyword">in</span> note <span class="hljs-keyword">else</span> <span class="hljs-number">0.25</span>)
get_samples = <span class="hljs-keyword">lambda</span> note: get_wave(*parse_note(note)) <span class="hljs-keyword">if</span> note <span class="hljs-keyword">else</span> get_pause(<span class="hljs-number">0.125</span>)
samples_f = chain.from_iterable(get_samples(n) <span class="hljs-keyword">for</span> n <span class="hljs-keyword">in</span> <span class="hljs-string">f'<span class="hljs-subst">{P1}</span><span class="hljs-subst">{P1}</span><span class="hljs-subst">{P2}</span>'</span>.split(<span class="hljs-string">','</span>))
samples_b = <span class="hljs-string">b''</span>.join(struct.pack(<span class="hljs-string">'&lt;h'</span>, int(f * <span class="hljs-number">30000</span>)) <span class="hljs-keyword">for</span> f <span class="hljs-keyword">in</span> samples_f)

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