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Random Access File Reader

This is a small library that allows for reading any given line in a file without having to read all the lines before it or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random access even on very large files for a very minuscule memory cost.

Installation

pip install random-access-file-reader

Usage

Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l
Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]
Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)

About

Low memory usage random access reader for csv and general files

Topics

csv-parsingfileiopythonrandom-access

Resources

Readme
Activity

Stars

14 stars

Watchers

1 watching

Forks

6 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Repository files navigation
Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
Resources
Readme
Activity
Stars
14 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
Resources
Readme
Activity
Stars
14 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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tests
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README.rst
requirements.txt
requirements.txt
setup.py
setup.py
Repository files navigation
Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
Resources
Readme
Activity
Stars
14 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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requirements.txt
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setup.py
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Repository files navigation
Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
Resources
Readme
Activity
Stars
14 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.rst
requirements.txt
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setup.py
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Repository files navigation
Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
Resources
Readme
Activity
Stars
14 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
Resources
Readme
Activity
Stars
14 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Used by
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Random Access File Reader
This is a small library that allows for reading any given line in a file without having to read all the lines before it
or load the entire file into memory. Only the line indexes and lengths are held in memory, which enables random
access even on very large files for a very minuscule memory cost.
Installation
pip install random-access-file-reader
Usage
Usage is very straightforward, and standard csv line endings (newline character), value delimiter (comma), and
quotation character (double quote) are the defaults. These can be changed in the constructor.

The get_line() and get_line_dicts() methods return a list of rows.

Plain text file example:
from randomAccessReader import RandomAccessReader
reader = RandomAccessReader('~/myfile.txt')
# single line
line = reader.get_lines(2)[0]
print line
# multiple lines
lines = reader.get_lines(3, 3)
for l in lines:
print l

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is False)

Csv example:
from randomAccessReader import CsvRandomAccessReader
reader = CsvRandomAccessReader('~/myfile.csv')
# single line
line = reader.get_line_dicts(5)[0]
for x in line:
print x + " = " line[x]
# multiple lines
lines = reader.get_line_dicts(6, 6)
for l in lines:
for x in l:
print x + " = " l[x]

Optional arguments in the constructor:
  • endline_character - self-explanatory (default is endline character \n)
  • ignore_blank_lines - if set to True, blank lines in the file will not be read or indexed (default is True)
  • values_delimiter - character used by the csv to separate values within a line (default is ,)
  • quotechar - character used by the csv to surround values that contain the value delimiting character (default is ")
  • ignore_corrupt - if set to True, lines with an invalid length will return blank instead of raising an exception (default is False)
About
Low memory usage random access reader for csv and general files
Topics
csv-parsingfileiopythonrandom-access
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