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python-cheatsheet
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Update of NumPy and Pandas

pull/167/head
Jure Šorn 1 year ago
parent
4ce2f4dd1f
commit
ca19a7a8d5
3 changed files with 19 additions and 19 deletions
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  1. 16
      README.md
  2. 20
      index.html
  3. 2
      parse.js

16
README.md
View File

@ -2685,7 +2685,7 @@ import numpy as np
```
```perl
<2d_bools> = <2d_array> ><== <el/1d/2d_array> # 1d_array must have size of a row.
<2d_bools> = <2d_array> > <el/1d/2d_array> # 1d_array must have size of a row.
<1d/2d_a> = <2d_array>[<2d/1d_bools>] # 1d_bools must have size of a column.
```
* **Indexes should not be tuples because Python converts `'obj[i, j]'` to `'obj[(i, j)]'`!**
@ -3161,8 +3161,8 @@ Name: a, dtype: int64
```
```python
<Sr> = <Sr> ><== <el/Sr> # Returns a Series of bools.
<Sr> = <Sr> +-*/ <el/Sr> # Items with non-matching keys get value NaN.
<Sr> = <Sr> > <el/Sr> # Returns a Series of bools.
<Sr> = <Sr> + <el/Sr> # Items with non-matching keys get value NaN.
```
```python
@ -3236,19 +3236,19 @@ b 3 4
```python
<Sr/DF> = <DF>[column_key/s] # Or: <DF>.column_key
<DF> = <DF>[row_bools] # Keeps rows as specified by bools.
<DF> = <DF>[<DF_of_bools>] # Assigns NaN to False values.
<DF> = <DF>[<DF_of_bools>] # Assigns NaN to values that are False in bools.
```
```python
<DF> = <DF> ><== <el/Sr/DF> # Returns DF of bools. Sr is treated as a row.
<DF> = <DF> +-*/ <el/Sr/DF> # Items with non-matching keys get value NaN.
<DF> = <DF> > <el/Sr/DF> # Returns DF of bools. Sr is treated as a row.
<DF> = <DF> + <el/Sr/DF> # Items with non-matching keys get value NaN.
```
```python
<DF> = <DF>.set_index(column_key) # Replaces row keys with values from a column.
<DF> = <DF>.set_index(column_key) # Replaces row keys with values from the column.
<DF> = <DF>.reset_index(drop=False) # Drops or moves row keys to column named index.
<DF> = <DF>.sort_index(ascending=True) # Sorts rows by row keys. Use `axis=1` for cols.
<DF> = <DF>.sort_values(column_key/s) # Sorts rows by the passed column/s. Same.
<DF> = <DF>.sort_values(column_key/s) # Sorts rows by passed column/s. Also `axis=1`.
```
#### DataFrame — Merge, Join, Concat:

20
index.html
View File

@ -54,7 +54,7 @@
<body>
<header>
<aside>September 16, 2023</aside>
<aside>September 17, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -2196,7 +2196,7 @@ $ snakeviz test.prof
&lt;1d_array&gt; = &lt;2d_array&gt;[row_indexes, column_indexes] <span class="hljs-comment"># &lt;3d_a&gt;[table_i/is, row_is, column_is]</span>
&lt;1d_array&gt; = &lt;2d_array&gt;[row_indexes, column_index] <span class="hljs-comment"># &lt;3d_a&gt;[table_i/is, row_is, column_i]</span>
</code></pre>
<pre><code class="bash hljs">&lt;2d_bools&gt; = &lt;2d_array&gt; &gt;&lt;== &lt;el/1d/2d_array&gt; <span class="hljs-comment"># 1d_array must have size of a row.</span>
<pre><code class="bash hljs">&lt;2d_bools&gt; = &lt;2d_array&gt; &gt; &lt;el/1d/2d_array&gt; <span class="hljs-comment"># 1d_array must have size of a row.</span>
&lt;1d/2d_a&gt; = &lt;2d_array&gt;[&lt;2d/1d_bools&gt;] <span class="hljs-comment"># 1d_bools must have size of a column.</span>
</code></pre>
<ul>
@ -2584,8 +2584,8 @@ Name: a, dtype: int64
&lt;Sr&gt; = &lt;Sr&gt;[keys/indexes] <span class="hljs-comment"># Or: &lt;Sr&gt;[&lt;keys_slice/slice&gt;]</span>
&lt;Sr&gt; = &lt;Sr&gt;[bools] <span class="hljs-comment"># Or: &lt;Sr&gt;.loc/iloc[bools]</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;Sr&gt; = &lt;Sr&gt; &gt;&lt;== &lt;el/Sr&gt; <span class="hljs-comment"># Returns a Series of bools.</span>
&lt;Sr&gt; = &lt;Sr&gt; +-*/ &lt;el/Sr&gt; <span class="hljs-comment"># Items with non-matching keys get value NaN.</span>
<pre><code class="python language-python hljs">&lt;Sr&gt; = &lt;Sr&gt; &gt; &lt;el/Sr&gt; <span class="hljs-comment"># Returns a Series of bools.</span>
&lt;Sr&gt; = &lt;Sr&gt; + &lt;el/Sr&gt; <span class="hljs-comment"># Items with non-matching keys get value NaN.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;Sr&gt; = pd.concat(&lt;coll_of_Sr&gt;) <span class="hljs-comment"># Concats multiple Series into one long Series.</span>
&lt;Sr&gt; = &lt;Sr&gt;.combine_first(&lt;Sr&gt;) <span class="hljs-comment"># Adds items that are not yet present.</span>
@ -2641,15 +2641,15 @@ b <span class="hljs-number">3</span> <span class="hljs-number">4</span>
</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>
&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 False values.</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>
</code></pre>
<pre><code class="python language-python hljs">&lt;DF&gt; = &lt;DF&gt; &gt;&lt;== &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>
<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>
</code></pre>
<pre><code class="python language-python hljs">&lt;DF&gt; = &lt;DF&gt;.set_index(column_key) <span class="hljs-comment"># Replaces row keys with values from a column.</span>
<pre><code class="python language-python hljs">&lt;DF&gt; = &lt;DF&gt;.set_index(column_key) <span class="hljs-comment"># Replaces row keys with values from the column.</span>
&lt;DF&gt; = &lt;DF&gt;.reset_index(drop=<span class="hljs-keyword">False</span>) <span class="hljs-comment"># Drops or moves row keys to column named index.</span>
&lt;DF&gt; = &lt;DF&gt;.sort_index(ascending=<span class="hljs-keyword">True</span>) <span class="hljs-comment"># Sorts rows by row keys. Use `axis=1` for cols.</span>
&lt;DF&gt; = &lt;DF&gt;.sort_values(column_key/s) <span class="hljs-comment"># Sorts rows by the passed column/s. Same.</span>
&lt;DF&gt; = &lt;DF&gt;.sort_values(column_key/s) <span class="hljs-comment"># Sorts rows by passed column/s. Also `axis=1`.</span>
</code></pre>
<div><h4 id="dataframemergejoinconcat">DataFrame — Merge, Join, Concat:</h4><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>l = pd.DataFrame([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>], [<span class="hljs-number">3</span>, <span class="hljs-number">4</span>]], index=[<span class="hljs-string">'a'</span>, <span class="hljs-string">'b'</span>], columns=[<span class="hljs-string">'x'</span>, <span class="hljs-string">'y'</span>])
x y
@ -2928,7 +2928,7 @@ $ deactivate <span class="hljs-comment"># Deactivates the activ
<footer>
<aside>September 16, 2023</aside>
<aside>September 17, 2023</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

2
parse.js
View File

@ -791,7 +791,7 @@ function changeCodeLanguages() {
$('code').not('.python').not('.text').not('.bash').not('.apache').addClass('python');
$('code:contains(<el> = <2d_array>[row_index, column_index])').removeClass().addClass('bash');
$('code:contains(<2d_array> = <2d_array>[row_indexes])').removeClass().addClass('bash');
$('code:contains(<2d_bools> = <2d_array> ><== <el/1d/2d_array>)').removeClass().addClass('bash');
$('code:contains(<2d_bools> = <2d_array> > <el/1d/2d_array>)').removeClass().addClass('bash');
$('code.perl').removeClass().addClass('python');
}

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