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python-cheatsheet
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Jure Šorn 2 years ago
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  1. 16
      README.md
  2. 20
      index.html

16
README.md
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@ -1824,12 +1824,12 @@ import csv
* **File must be opened with a `'newline=""'` argument, or '\r' will be added in front of every '\n' on platforms that use '\r\n' line endings!**
### Parameters
* **`'dialect'` - Master parameter that sets the default values.**
* **`'dialect'` - Master parameter that sets the default values. String or a dialect object.**
* **`'delimiter'` - A one-character string used to separate fields.**
* **`'quotechar'` - Character for quoting fields that contain special characters.**
* **`'doublequote'` - Whether quotechars inside fields get doubled or escaped.**
* **`'skipinitialspace'` - Whether whitespace after delimiter gets stripped.**
* **`'lineterminator'` - Specifies how writer terminates rows.**
* **`'doublequote'` - Whether quotechars inside fields are/get doubled or escaped.**
* **`'skipinitialspace'` - Whether whitespace after delimiter gets stripped by reader.**
* **`'lineterminator'` - How writer terminates rows. Reader is hardcoded to '\r', '\n', '\r\n'.**
* **`'quoting'` - Controls the amount of quoting: 0 - as necessary, 1 - all.**
* **`'escapechar'` - Character for escaping quotechars if doublequote is False.**
@ -1850,16 +1850,16 @@ import csv
### Read Rows from CSV File
```python
def read_csv_file(filename):
def read_csv_file(filename, dialect='excel'):
with open(filename, encoding='utf-8', newline='') as file:
return list(csv.reader(file))
return list(csv.reader(file, dialect))
```
### Write Rows to CSV File
```python
def write_to_csv_file(filename, rows):
def write_to_csv_file(filename, rows, dialect='excel'):
with open(filename, 'w', encoding='utf-8', newline='') as file:
writer = csv.writer(file)
writer = csv.writer(file, dialect)
writer.writerows(rows)
```

20
index.html
View File

@ -54,7 +54,7 @@
<body>
<header>
<aside>May 20, 2022</aside>
<aside>May 23, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</header>
@ -1523,12 +1523,12 @@ CompletedProcess(args=[<span class="hljs-string">'bc'</span>, <span class="hljs-
<li><strong>File must be opened with a <code class="python hljs"><span class="hljs-string">'newline=""'</span></code> argument, or '\r' will be added in front of every '\n' on platforms that use '\r\n' line endings!</strong></li>
</ul>
<div><h3 id="parameters">Parameters</h3><ul>
<li><strong><code class="python hljs"><span class="hljs-string">'dialect'</span></code> - Master parameter that sets the default values.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'dialect'</span></code> - Master parameter that sets the default values. String or a dialect object.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'delimiter'</span></code> - A one-character string used to separate fields.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'quotechar'</span></code> - Character for quoting fields that contain special characters.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'doublequote'</span></code> - Whether quotechars inside fields get doubled or escaped.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'skipinitialspace'</span></code> - Whether whitespace after delimiter gets stripped.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'lineterminator'</span></code> - Specifies how writer terminates rows.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'doublequote'</span></code> - Whether quotechars inside fields are/get doubled or escaped.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'skipinitialspace'</span></code> - Whether whitespace after delimiter gets stripped by reader.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'lineterminator'</span></code> - How writer terminates rows. Reader is hardcoded to '\r', '\n', '\r\n'.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'quoting'</span></code> - Controls the amount of quoting: 0 - as necessary, 1 - all.</strong></li>
<li><strong><code class="python hljs"><span class="hljs-string">'escapechar'</span></code> - Character for escaping quotechars if doublequote is False.</strong></li>
</ul><div><h3 id="dialects">Dialects</h3><pre><code class="text language-text">┏━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━┓
@ -1546,14 +1546,14 @@ 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)</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>)</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))
<span class="hljs-keyword">return</span> list(csv.reader(file, dialect))
</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)</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>)</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)
writer = csv.writer(file, dialect)
writer.writerows(rows)
</code></pre></div>
@ -2896,7 +2896,7 @@ $ pyinstaller script.py --add-data '&lt;path&gt;:.' <span class="hljs-comment">
<footer>
<aside>May 20, 2022</aside>
<aside>May 23, 2022</aside>
<a href="https://gto76.github.io" rel="author">Jure Šorn</a>
</footer>

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