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python-cheatsheet
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Small fixes

pull/46/head
Jure Šorn 4 years ago
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2 changed files with 38 additions and 38 deletions
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  1. 38
      README.md
  2. 38
      index.html

38
README.md
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@ -379,9 +379,9 @@ import re
* **By default digits, whitespaces and alphanumerics from all alphabets are matched, unless `'flags=re.ASCII'` argument is used.**
* **Use capital letter for negation.**
```python
'\d' == '[0-9]' # Digit
'\s' == '[ \t\n\r\f\v]' # Whitespace
'\w' == '[a-zA-Z0-9_]' # Alphanumeric
'\d' == '[0-9]' # Matches any digit.
'\s' == '[ \t\n\r\f\v]' # Matches any whitespace.
'\w' == '[a-zA-Z0-9_]' # Matches any alphanumeric.
```
@ -1303,11 +1303,11 @@ class <enum_name>(Enum):
* **Otherwise it returns an increment of the last numeric value.**
```python
<member> = <enum>.<member_name> # Returns a member.
<member> = <enum>['<member_name>'] # Returns a member or raises KeyError.
<member> = <enum>(<value>) # Returns a member or raises ValueError.
name = <member>.name
value = <member>.value
<member> = <enum>.<member_name> # Returns a member.
<member> = <enum>['<member_name>'] # Returns a member or raises KeyError.
<member> = <enum>(<value>) # Returns a member or raises ValueError.
<str> = <member>.name # Returns member's name.
<obj> = <member>.value # Returns member's value.
```
```python
@ -2094,9 +2094,9 @@ Introspection
### Variables
```python
<list> = dir() # Names of variables in current scope.
<dict> = locals() # Dict of local variables. Also vars().
<dict> = globals() # Dict of global variables.
<list> = dir() # Returns names of variables in current scope.
<dict> = locals() # Returns dict of local variables. Also vars().
<dict> = globals() # Returns dict of global variables.
```
### Attributes
@ -2168,8 +2168,8 @@ class MyClass(metaclass=MyMetaClass):
### Type Diagram
```python
type(MyClass) == MyMetaClass # MyClass is an instance of MyMetaClass.
type(MyMetaClass) == type # MyMetaClass is an instance of type.
type(MyClass) == MyMetaClass # MyClass is an instance of MyMetaClass.
type(MyMetaClass) == type # MyMetaClass is an instance of type.
```
```text
@ -2186,8 +2186,8 @@ type(MyMetaClass) == type # MyMetaClass is an instance of type.
### Inheritance Diagram
```python
MyClass.__base__ == object # MyClass is a subclass of object.
MyMetaClass.__base__ == type # MyMetaClass is a subclass of type.
MyClass.__base__ == object # MyClass is a subclass of object.
MyMetaClass.__base__ == type # MyMetaClass is a subclass of type.
```
```text
@ -2575,14 +2575,14 @@ indexes = <array>.argmin(axis)
**Broadcasting is a set of rules by which NumPy functions operate on arrays of different sizes and/or dimensions.**
```python
left = [[0.1], [0.6], [0.8]] # Shape: (3, 1)
right = [ 0.1 , 0.6 , 0.8 ] # Shape: (3)
left = [[0.1], [0.6], [0.8]] # Shape: (3, 1)
right = [ 0.1 , 0.6 , 0.8 ] # Shape: (3)
```
#### 1. If array shapes differ in length, left-pad the shorter shape with ones:
```python
left = [[0.1], [0.6], [0.8]] # Shape: (3, 1)
right = [[0.1 , 0.6 , 0.8]] # Shape: (1, 3) <- !
left = [[0.1], [0.6], [0.8]] # Shape: (3, 1)
right = [[0.1 , 0.6 , 0.8]] # Shape: (1, 3) <- !
```
#### 2. If any dimensions differ in size, expand the ones that have size 1 by duplicating their elements:

38
index.html
View File

@ -483,9 +483,9 @@ to_exclusive = &lt;range&gt;.stop
<div><h3 id="specialsequences">Special Sequences</h3><ul>
<li><strong>By default digits, whitespaces and alphanumerics from all alphabets are matched, unless <code class="python hljs"><span class="hljs-string">'flags=re.ASCII'</span></code> argument is used.</strong></li>
<li><strong>Use capital letter for negation.</strong></li>
</ul><pre><code class="python language-python hljs"><span class="hljs-string">'\d'</span> == <span class="hljs-string">'[0-9]'</span> <span class="hljs-comment"># Digit</span>
<span class="hljs-string">'\s'</span> == <span class="hljs-string">'[ \t\n\r\f\v]'</span> <span class="hljs-comment"># Whitespace</span>
<span class="hljs-string">'\w'</span> == <span class="hljs-string">'[a-zA-Z0-9_]'</span> <span class="hljs-comment"># Alphanumeric</span>
</ul><pre><code class="python language-python hljs"><span class="hljs-string">'\d'</span> == <span class="hljs-string">'[0-9]'</span> <span class="hljs-comment"># Matches any digit.</span>
<span class="hljs-string">'\s'</span> == <span class="hljs-string">'[ \t\n\r\f\v]'</span> <span class="hljs-comment"># Matches any whitespace.</span>
<span class="hljs-string">'\w'</span> == <span class="hljs-string">'[a-zA-Z0-9_]'</span> <span class="hljs-comment"># Matches any alphanumeric.</span>
</code></pre></div>
@ -1232,11 +1232,11 @@ Hello World!
<li><strong>If there are no numeric values before auto(), it returns 1.</strong></li>
<li><strong>Otherwise it returns an increment of the last numeric value.</strong></li>
</ul>
<pre><code class="python language-python hljs">&lt;member&gt; = &lt;enum&gt;.&lt;member_name&gt; <span class="hljs-comment"># Returns a member.</span>
&lt;member&gt; = &lt;enum&gt;[<span class="hljs-string">'&lt;member_name&gt;'</span>] <span class="hljs-comment"># Returns a member or raises KeyError.</span>
&lt;member&gt; = &lt;enum&gt;(&lt;value&gt;) <span class="hljs-comment"># Returns a member or raises ValueError.</span>
name = &lt;member&gt;.name
value = &lt;member&gt;.value
<pre><code class="python language-python hljs">&lt;member&gt; = &lt;enum&gt;.&lt;member_name&gt; <span class="hljs-comment"># Returns a member.</span>
&lt;member&gt; = &lt;enum&gt;[<span class="hljs-string">'&lt;member_name&gt;'</span>] <span class="hljs-comment"># Returns a member or raises KeyError.</span>
&lt;member&gt; = &lt;enum&gt;(&lt;value&gt;) <span class="hljs-comment"># Returns a member or raises ValueError.</span>
&lt;str&gt; = &lt;member&gt;.name <span class="hljs-comment"># Returns member's name.</span>
&lt;obj&gt; = &lt;member&gt;.value <span class="hljs-comment"># Returns member's value.</span>
</code></pre>
<pre><code class="python language-python hljs">list_of_members = list(&lt;enum&gt;)
member_names = [a.name <span class="hljs-keyword">for</span> a <span class="hljs-keyword">in</span> &lt;enum&gt;]
@ -1831,9 +1831,9 @@ product_of_elems = functools.reduce(op.mul, &lt;collection&gt;)
LogicOp = enum.Enum(<span class="hljs-string">'LogicOp'</span>, {<span class="hljs-string">'AND'</span>: op.and_, <span class="hljs-string">'OR'</span> : op.or_})
last_el = op.methodcaller(<span class="hljs-string">'pop'</span>)(&lt;list&gt;)
</code></pre>
<div><h2 id="introspection"><a href="#introspection" name="introspection">#</a>Introspection</h2><p><strong>Inspecting code at runtime.</strong></p><div><h3 id="variables">Variables</h3><pre><code class="python language-python hljs">&lt;list&gt; = dir() <span class="hljs-comment"># Names of variables in current scope.</span>
&lt;dict&gt; = locals() <span class="hljs-comment"># Dict of local variables. Also vars().</span>
&lt;dict&gt; = globals() <span class="hljs-comment"># Dict of global variables.</span>
<div><h2 id="introspection"><a href="#introspection" name="introspection">#</a>Introspection</h2><p><strong>Inspecting code at runtime.</strong></p><div><h3 id="variables">Variables</h3><pre><code class="python language-python hljs">&lt;list&gt; = dir() <span class="hljs-comment"># Returns names of variables in current scope.</span>
&lt;dict&gt; = locals() <span class="hljs-comment"># Returns dict of local variables. Also vars().</span>
&lt;dict&gt; = globals() <span class="hljs-comment"># Returns dict of global variables.</span>
</code></pre></div></div>
@ -1884,8 +1884,8 @@ param_names = list(&lt;sig&gt;.parameters.keys())
<pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span>MyClass.a, MyClass.b
(<span class="hljs-string">'abcde'</span>, <span class="hljs-number">12345</span>)
</code></pre>
<div><h3 id="typediagram">Type Diagram</h3><pre><code class="python language-python hljs">type(MyClass) == MyMetaClass <span class="hljs-comment"># MyClass is an instance of MyMetaClass.</span>
type(MyMetaClass) == type <span class="hljs-comment"># MyMetaClass is an instance of type.</span>
<div><h3 id="typediagram">Type Diagram</h3><pre><code class="python language-python hljs">type(MyClass) == MyMetaClass <span class="hljs-comment"># MyClass is an instance of MyMetaClass.</span>
type(MyMetaClass) == type <span class="hljs-comment"># MyMetaClass is an instance of type.</span>
</code></pre></div>
<pre><code class="text language-text">+-------------+-------------+
@ -1898,8 +1898,8 @@ type(MyMetaClass) == type <span class="hljs-comment"># MyMetaClass is an
| str ---------+ |
+-------------+-------------+
</code></pre>
<div><h3 id="inheritancediagram">Inheritance Diagram</h3><pre><code class="python language-python hljs">MyClass.__base__ == object <span class="hljs-comment"># MyClass is a subclass of object.</span>
MyMetaClass.__base__ == type <span class="hljs-comment"># MyMetaClass is a subclass of type.</span>
<div><h3 id="inheritancediagram">Inheritance Diagram</h3><pre><code class="python language-python hljs">MyClass.__base__ == object <span class="hljs-comment"># MyClass is a subclass of object.</span>
MyMetaClass.__base__ == type <span class="hljs-comment"># MyMetaClass is a subclass of type.</span>
</code></pre></div>
<pre><code class="text language-text">+-------------+-------------+
@ -2197,13 +2197,13 @@ indexes = &lt;array&gt;.argmin(axis)
<ul>
<li><strong>If row and column indexes differ in shape, they are combined with broadcasting.</strong></li>
</ul>
<div><h3 id="broadcasting">Broadcasting</h3><p><strong>Broadcasting is a set of rules by which NumPy functions operate on arrays of different sizes and/or dimensions.</strong></p><pre><code class="python language-python hljs">left = [[<span class="hljs-number">0.1</span>], [<span class="hljs-number">0.6</span>], [<span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (3, 1)</span>
right = [ <span class="hljs-number">0.1</span> , <span class="hljs-number">0.6</span> , <span class="hljs-number">0.8</span> ] <span class="hljs-comment"># Shape: (3)</span>
<div><h3 id="broadcasting">Broadcasting</h3><p><strong>Broadcasting is a set of rules by which NumPy functions operate on arrays of different sizes and/or dimensions.</strong></p><pre><code class="python language-python hljs">left = [[<span class="hljs-number">0.1</span>], [<span class="hljs-number">0.6</span>], [<span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (3, 1)</span>
right = [ <span class="hljs-number">0.1</span> , <span class="hljs-number">0.6</span> , <span class="hljs-number">0.8</span> ] <span class="hljs-comment"># Shape: (3)</span>
</code></pre></div>
<div><h4 id="1ifarrayshapesdifferinlengthleftpadtheshortershapewithones">1. If array shapes differ in length, left-pad the shorter shape with ones:</h4><pre><code class="python language-python hljs">left = [[<span class="hljs-number">0.1</span>], [<span class="hljs-number">0.6</span>], [<span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (3, 1)</span>
right = [[<span class="hljs-number">0.1</span> , <span class="hljs-number">0.6</span> , <span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (1, 3) &lt;- !</span>
<div><h4 id="1ifarrayshapesdifferinlengthleftpadtheshortershapewithones">1. If array shapes differ in length, left-pad the shorter shape with ones:</h4><pre><code class="python language-python hljs">left = [[<span class="hljs-number">0.1</span>], [<span class="hljs-number">0.6</span>], [<span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (3, 1)</span>
right = [[<span class="hljs-number">0.1</span> , <span class="hljs-number">0.6</span> , <span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (1, 3) &lt;- !</span>
</code></pre></div>
<div><h4 id="2ifanydimensionsdifferinsizeexpandtheonesthathavesize1byduplicatingtheirelements">2. If any dimensions differ in size, expand the ones that have size 1 by duplicating their elements:</h4><pre><code class="python language-python hljs">left = [[<span class="hljs-number">0.1</span>, <span class="hljs-number">0.1</span>, <span class="hljs-number">0.1</span>], [<span class="hljs-number">0.6</span>, <span class="hljs-number">0.6</span>, <span class="hljs-number">0.6</span>], [<span class="hljs-number">0.8</span>, <span class="hljs-number">0.8</span>, <span class="hljs-number">0.8</span>]] <span class="hljs-comment"># Shape: (3, 3) &lt;- !</span>

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