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python-cheatsheet
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Jure Šorn 4 years ago
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  1. 56
      README.md
  2. 39
      index.html

56
README.md
View File

@ -1561,7 +1561,7 @@ def write_to_file(filename, text):
Path
----
```python
from os import getcwd, path, listdir
from os import getcwd, path, listdir, scandir
from glob import glob
```
@ -1578,10 +1578,29 @@ from glob import glob
```
```python
<list> = listdir(<path>) # Returns filenames located at path.
<list> = listdir(path='.') # Returns filenames located at path.
<list> = glob('<pattern>') # Returns paths matching the wildcard pattern.
```
```python
<bool> = path.exists(<path>) # Or: <Path>.exists()
<bool> = path.isfile(<path>) # Or: <DirEntry/Path>.is_file()
<bool> = path.isdir(<path>) # Or: <DirEntry/Path>.is_dir()
```
### DirEntry
**Using scandir() instead of listdir() can significantly increase the performance of code that also needs file type information.**
```python
<iter> = scandir(path='.') # Returns DirEntry objects located at path.
```
```python
<str> = <DirEntry>.path # Returns path as a string.
<str> = <DirEntry>.name # Returns final component as a string.
<file> = open(<DirEntry>) # Opens the file and returns a file object.
```
### Path Object
```python
from pathlib import Path
@ -1600,47 +1619,20 @@ from pathlib import Path
```python
<Path> = <Path>.parent # Returns Path without final component.
<str> = <Path>.name # Returns final component as string.
<str> = <Path>.name # Returns final component as a string.
<str> = <Path>.stem # Returns final component without extension.
<str> = <Path>.suffix # Returns final component's extension.
<tup.> = <Path>.parts # Returns all components as strings.
```
```python
<iter> = <Path>.iterdir() # Returns dir contents as Path objects.
<iter> = <Path>.glob('<pattern>') # Returns Paths matching the wildcard pattern.
```
```python
<bool> = <Path>.exists() # Or: path.exists(<path>)
<bool> = <Path>.is_file() # Or: path.isfile(<path>)
<bool> = <Path>.is_dir() # Or: path.isdir(<path>)
```
```python
<str> = str(<Path>) # Returns Path as a string.
<file> = open(<Path>) # Opens the file and returns a file object.
```
### DirEntry
**Using scandir() instead of listdir() or iterdir() can significantly increase the performance of code that also needs file type or file attribute information.**
```python
<iter> = os.scandir(path='.') # Returns DirEntry objects located at path.
```
```python
<bool> = <DirEntry>.is_file()
<bool> = <DirEntry>.is_dir()
```
```python
<str> = <DirEntry>.path # Returns relative path as a string.
<str> = <DirEntry>.name # Returns final component.
```
```python
<Path> = Path(<DirEntry>) # Returns relative Path object.
<file> = open(<DirEntry>) # Opens the file and returns a file object.
<iter> = <Path>.iterdir() # Returns dir contents as Path objects.
<iter> = <Path>.glob('<pattern>') # Returns Paths matching the wildcard pattern.
```

39
index.html
View File

@ -1443,7 +1443,7 @@ value = args.&lt;name&gt;
file.write(text)
</code></pre></div>
<div><h2 id="path"><a href="#path" name="path">#</a>Path</h2><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> os <span class="hljs-keyword">import</span> getcwd, path, listdir
<div><h2 id="path"><a href="#path" name="path">#</a>Path</h2><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> os <span class="hljs-keyword">import</span> getcwd, path, listdir, scandir
<span class="hljs-keyword">from</span> glob <span class="hljs-keyword">import</span> glob
</code></pre></div>
@ -1455,9 +1455,21 @@ value = args.&lt;name&gt;
&lt;str&gt; = path.dirname(&lt;path&gt;) <span class="hljs-comment"># Returns path without final component.</span>
&lt;tup.&gt; = path.splitext(&lt;path&gt;) <span class="hljs-comment"># Splits on last period of final component.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;list&gt; = listdir(&lt;path&gt;) <span class="hljs-comment"># Returns filenames located at path.</span>
<pre><code class="python language-python hljs">&lt;list&gt; = listdir(path=<span class="hljs-string">'.'</span>) <span class="hljs-comment"># Returns filenames located at path.</span>
&lt;list&gt; = glob(<span class="hljs-string">'&lt;pattern&gt;'</span>) <span class="hljs-comment"># Returns paths matching the wildcard pattern.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;bool&gt; = path.exists(&lt;path&gt;) <span class="hljs-comment"># Or: &lt;Path&gt;.exists()</span>
&lt;bool&gt; = path.isfile(&lt;path&gt;) <span class="hljs-comment"># Or: &lt;DirEntry/Path&gt;.is_file()</span>
&lt;bool&gt; = path.isdir(&lt;path&gt;) <span class="hljs-comment"># Or: &lt;DirEntry/Path&gt;.is_dir()</span>
</code></pre>
<div><h3 id="direntry">DirEntry</h3><p><strong>Using scandir() instead of listdir() can significantly increase the performance of code that also needs file type information.</strong></p><pre><code class="python language-python hljs">&lt;iter&gt; = scandir(path=<span class="hljs-string">'.'</span>) <span class="hljs-comment"># Returns DirEntry objects located at path.</span>
</code></pre></div>
<pre><code class="python language-python hljs">&lt;str&gt; = &lt;DirEntry&gt;.path <span class="hljs-comment"># Returns path as a string.</span>
&lt;str&gt; = &lt;DirEntry&gt;.name <span class="hljs-comment"># Returns final component as a string.</span>
&lt;file&gt; = open(&lt;DirEntry&gt;) <span class="hljs-comment"># Opens the file and returns a file object.</span>
</code></pre>
<div><h3 id="pathobject">Path Object</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> pathlib <span class="hljs-keyword">import</span> Path
</code></pre></div>
@ -1469,33 +1481,16 @@ value = args.&lt;name&gt;
&lt;Path&gt; = &lt;Path&gt;.resolve() <span class="hljs-comment"># Returns absolute Path without symlinks.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;Path&gt; = &lt;Path&gt;.parent <span class="hljs-comment"># Returns Path without final component.</span>
&lt;str&gt; = &lt;Path&gt;.name <span class="hljs-comment"># Returns final component as string.</span>
&lt;str&gt; = &lt;Path&gt;.name <span class="hljs-comment"># Returns final component as a string.</span>
&lt;str&gt; = &lt;Path&gt;.stem <span class="hljs-comment"># Returns final component without extension.</span>
&lt;str&gt; = &lt;Path&gt;.suffix <span class="hljs-comment"># Returns final component's extension.</span>
&lt;tup.&gt; = &lt;Path&gt;.parts <span class="hljs-comment"># Returns all components as strings.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;iter&gt; = &lt;Path&gt;.iterdir() <span class="hljs-comment"># Returns dir contents as Path objects.</span>
&lt;iter&gt; = &lt;Path&gt;.glob(<span class="hljs-string">'&lt;pattern&gt;'</span>) <span class="hljs-comment"># Returns Paths matching the wildcard pattern.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;bool&gt; = &lt;Path&gt;.exists() <span class="hljs-comment"># Or: path.exists(&lt;path&gt;)</span>
&lt;bool&gt; = &lt;Path&gt;.is_file() <span class="hljs-comment"># Or: path.isfile(&lt;path&gt;)</span>
&lt;bool&gt; = &lt;Path&gt;.is_dir() <span class="hljs-comment"># Or: path.isdir(&lt;path&gt;)</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;str&gt; = str(&lt;Path&gt;) <span class="hljs-comment"># Returns Path as a string.</span>
&lt;file&gt; = open(&lt;Path&gt;) <span class="hljs-comment"># Opens the file and returns a file object.</span>
</code></pre>
<div><h3 id="direntry">DirEntry</h3><p><strong>Using scandir() instead of listdir() or iterdir() can significantly increase the performance of code that also needs file type or file attribute information.</strong></p><pre><code class="python language-python hljs">&lt;iter&gt; = os.scandir(path=<span class="hljs-string">'.'</span>) <span class="hljs-comment"># Returns DirEntry objects located at path.</span>
</code></pre></div>
<pre><code class="python language-python hljs">&lt;bool&gt; = &lt;DirEntry&gt;.is_file()
&lt;bool&gt; = &lt;DirEntry&gt;.is_dir()
</code></pre>
<pre><code class="python language-python hljs">&lt;str&gt; = &lt;DirEntry&gt;.path <span class="hljs-comment"># Returns relative path as a string.</span>
&lt;str&gt; = &lt;DirEntry&gt;.name <span class="hljs-comment"># Returns final component.</span>
</code></pre>
<pre><code class="python language-python hljs">&lt;Path&gt; = Path(&lt;DirEntry&gt;) <span class="hljs-comment"># Returns relative Path object.</span>
&lt;file&gt; = open(&lt;DirEntry&gt;) <span class="hljs-comment"># Opens the file and returns a file object.</span>
<pre><code class="python language-python hljs">&lt;iter&gt; = &lt;Path&gt;.iterdir() <span class="hljs-comment"># Returns dir contents as Path objects.</span>
&lt;iter&gt; = &lt;Path&gt;.glob(<span class="hljs-string">'&lt;pattern&gt;'</span>) <span class="hljs-comment"># Returns Paths matching the wildcard pattern.</span>
</code></pre>
<div><h2 id="oscommands"><a href="#oscommands" name="oscommands">#</a>OS Commands</h2><div><h3 id="filesanddirectories">Files and Directories</h3><ul>
<li><strong>Paths can be either strings, Paths, or DirEntry objects.</strong></li>

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