MG's Snippets
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Python
read csv to row
import csv
with open('eggs.csv', newline='') as csvfile:
spamreader = csv.reader(csvfile)
for row in spamreader:
print(', '.join(row))
read csv to row dict
with open('names.csv', newline='') as csvfile:
reader = csv.DictReader(csvfile)
for row in reader:
print(row['first_name'], row['last_name'])
write csv
import csv
with open('eggs.csv', 'w', newline='') as csvfile:
spamwriter = csv.writer(csvfile)
spamwriter.writerow(['Spam'] * 5 + ['Baked Beans'])
spamwriter.writerow(['Spam', 'Lovely Spam', 'Wonderful Spam'])
write csv dict
import csv
with open('eggs.csv', 'w', newline='') as csvfile:
spamwriter = csv.DictWriter(csvfile, fieldnames=['foo', 'bar', 'value'])
spamwriter.writeheader()
spamwriter.writerow({
'foo': 'x',
'bar': 'y',
'value': 'abc'
})
Python app with csv in/out file
import csv
import argparse
import sys
def main(args):
print("--- Script starting ---")
data = {}
fieldnames = [args.field]
reader = csv.DictReader(args.infile)
stats = {
'empty': 0,
'ignore': 0,
'total': 0,
}
if args.verbose:
print(f'stats: {stats}')
print("--- Script finished ---")
return 0
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='raw parser')
parser.add_argument(
'infile',
type=argparse.FileType('r'),
default=sys.stdin)
parser.add_argument(
'field',
type=str,
help='field name'
)
parser.add_argument(
'--relate',
nargs='?',
type=str,
help='related field name'
)
parser.add_argument(
'--out',
nargs='?',
type=argparse.FileType('w')
)
parser.add_argument(
"-v", "--verbose",
action="store_true", # This makes it a flag
help="Enable verbose output."
)
parsed_args = parser.parse_args()
sys.exit(main(parsed_args))
JavaScript
IIFE - MDN Web Docs Glossary: Definitions of Web-related terms | MDNiterate object entries
for (const [key, value] of Object.entries(object1)) {
console.log(`${key}: ${value}`);
}
fetch many urls and wait all promises
const fetchData = async (url) => {
try {
let response = await fetch(url);
return await response.json();
} catch(error) {
console.error(`fetch error) ${error} | ${url}`);
return error.message;
}
};
const fetchURLs = async (urls) => {
return await Promise.all(urls.map( async ([key, url]) => {
let res = await fetchData(url);
return [key, res];
}));
};
fetchURLs(urls)
.then(data => {
console.log('Fetched data:', data)})
.catch(error => {
console.error('Error fetching data:', error)
});
HTML
usual layout structure
<html>
<head>
</head>
<body>
<main>
<header> </header>
<section> </section>
<section> </section>
<section> </section>
<footer> </footer>
</main>
</body>
</html>
Document Templates
MkDocs Blog
---
date: 2026-01-15
categories:
- Journal
tags:
- tag1
- tag2
---
# Header1
<!-- more -->
Make code block wrap
reST (ReStructuredText)
###
Parts
###
***
Chapters (filename)
***
Section
===
or
# SECTION (all Upper case)
Subsection
-----------
or
## Subsection (capitalize)
Bookmarklet
copy markdown link
refined by gemini (strip tracking parameters (like fbclid, gclid, or utm_*))
javascript:javascript:(function(){const e=new URL(window.location.href),t=["fbclid","gclid","msclkid","dclid","twclid","mc_eid","igshid","_ga","_gl"];Array.from(e.searchParams.keys()).forEach(o=>{ (t.includes(o.toLowerCase())||o.toLowerCase().startsWith("utm_"))&&e.searchParams.delete(o) });const o=e.toString(),n=document.title.replace(/[\[\]]/g,"\\$&"),r=`[${n}](${o})`;navigator.clipboard.writeText(r).then(()=>{const e=document.createElement("div");e.textContent="Copied clean Markdown link!",Object.assign(e.style,{position:"fixed",bottom:"20px",right:"20px",padding:"10px 16px",background:"#222",color:"#fff",fontSize:"14px",borderRadius:"6px",zIndex:"999999",boxShadow:"0 4px 6px rgba(0,0,0,0.2)"}),document.body.appendChild(e),setTimeout(()=>e.remove(),2000)}).catch(()=>{prompt("Copy Clean Markdown Link:",r)})})();