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<table border="1" cellpadding="3" cellspacing="0"  style="border:1px solid black;border-collapse:collapse;">
<tr><td  style="background-color:lightBlue;"  colspan="2"; ><b>IPython -- An enhanced Interactive Python - Quick Reference Card</b></td></tr>
<tr><td colspan="2"; > </td></tr>
<tr><td   style="border-bottom: 1px solid transparent;"> obj?, obj?? </td><td   style="border-bottom: 1px solid transparent;"> Get help, or more help for object (also works as</tr>
<tr><td   style="border-top: 1px solid transparent;">   </td><td   style="border-top: 1px solid transparent;"> ?obj, ??obj).</tr>
<tr><td>?foo.*abc*</td><td> List names in 'foo' containing 'abc' in them.</td></tr>
<tr><td>%magic</td><td> Information about IPython's 'magic' % functions.</td></tr>
<tr><td colspan="2"; > </td></tr>
<tr><td colspan="2";   style="border-bottom: 1px solid transparent;">Magic functions are prefixed by % or %%, and typically take their arguments</td></tr>
<tr><td colspan="2";   style="border-top: 1px solid transparent; border-

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Python Regular Expressions

Non-special chars match themselves. Exceptions are special characters:

\       Escape special char or start a sequence.
.       Match any char except newline, see re.DOTALL
^       Match start of the string, see re.MULTILINE
$       Match end of the string, see re.MULTILINE
[]      Enclose a set of matchable chars

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{
   "C0":   16.35,
  "C#0":   17.32,
  "Db0":   17.32,
   "D0":   18.35,
  "D#0":   19.45,
  "Eb0":   19.45,
   "E0":   20.60,
   "F0":   21.83,
  "F#0":   23.12,

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tmux Cheat Sheet

Table of Contents

• General Usage
• Shortcuts
• Commands
• Scripting tmux
• Configuring tmux

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------------------------------------
-- Script for Interactive Session --
------------------------------------

-- Have messages displayed in English
SET lc_messages TO 'en_US.UTF-8';


-- CREATE Employees -----------------------------------------------------------

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#!/bin/bash

# Removes the xorg-x11-drv-nouveau package from this machine, because it's not needed
sudo dnf remove xorg-x11-drv-nouveau -y

# Blacklist the nouveau module as a module and in dracut
sudo echo 'blacklist nouveau' > /etc/modprobe.d/blacklist-nouveau.conf
sudo echo 'omit_drivers+=" nouveau "' > /etc/dracut.conf.d/blacklist-nouveau.conf

# Backup the current initramfs

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To remove a submodule you need to:

• Delete the relevant section from the .gitmodules file.
• Stage the .gitmodules changes git add .gitmodules
• Delete the relevant section from .git/config.
• Run git rm --cached path_to_submodule (no trailing slash).
• Run rm -rf .git/modules/path_to_submodule (no trailing slash).
• Commit git commit -m "Removed submodule "
• Delete the now untracked submodule files rm -rf path_to_submodule

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--[[ json.lua

A compact pure-Lua JSON library.
The main functions are: json.stringify, json.parse.

## json.stringify:

This expects the following to be true of any tables being encoded:
 * They only have string or number keys. Number keys must be represented as
   strings in json; this is part of the json spec.

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Migrate Patroni PostgreSQL cluster to cloudnative-pg

Prerequisites

• Stable connection to Patroni cluster from cnpg nodes
• Same major PostgreSQL version (for example 15.1, cnpg image tag needs to correspond to that)
• Empty files called custom.conf and override.conf inside pgdata folder on all nodes (folder where postgresql.conf is)
• User named strictly streaming_replica with REPLICATION ROLE attached (if it's not streaming_replica cnpg will fail because it needs that user to exist)
• Patroni dynamic config: