Marco Feng fengt

Pass arrays to shared libraries from python using C types

This example implements a simple shared library in C.

This library called libfifthy exposes a function called add_fifthy which takes an array of integers and modify it in place by adding 50 to all elements.

Then there's some code in python which builds an array and invokes the add_fifthy from the shared library and reads the altered array values.

Usage

Installing gcc 4.8 and Linuxbrew on CentOS 6

The GCC distributed with CentOS 6 is 4.4.7, which is pretty outdated. I'd like to use gcc 4.8+. Also, when trying to install Linuxbrew you run into a dependency loop where Homebrew's gcc depends on zlib, which depends on gcc. Here's how I solved the problem.

Note: Requires sudo privileges.

Resources:

http://superuser.com/a/676337/88393: Forum response on using CERN's open Scientific Linux distribution of RHEL's developer toolset.
http://linux.web.cern.ch/linux/devtoolset/: CERN's developer toolset installation instructions.

	How to Completely Remove Android Studio


	Execute these commands from the terminal

	rm -Rf /Applications/Android\ Studio.app
	rm -Rf ~/Library/Preferences/AndroidStudio*
	rm ~/Library/Preferences/com.google.android.studio.plist
	rm -Rf ~/Library/Application\ Support/AndroidStudio*
	rm -Rf ~/Library/Logs/AndroidStudio*

	Copyright 2025 Chun-Min Chang

	Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OT

	# Exporting entire database:
	mysqldump -u user -p database --opt \| gzip > database.sql.gz

	# Export table
	mysqldump -uroot --opt --databases DB_NAME --tables TABLE_NAME \| gzip > /tmp/TABLE_NAME.export.sql.gz

	# Importing:
	gunzip < database.sql.gz \| mysql -u user -p database

	# Credit http://failshell.io/mysql/using-gzip-and-gunzip-with-mysql-to-importexport-backups/

	#!/usr/bin/env python
	import sys
	import pandas as pd
	import pymongo
	import json



	def import_content(filepath):
	mng_client = pymongo.MongoClient('localhost', 27017)

	### INSTALLATION NOTES ###
	# 1. Install Homebrew (https://github.com/mxcl/homebrew)
	# 2. brew install zsh
	# 3. Install OhMyZsh (https://github.com/robbyrussell/oh-my-zsh)
	# 4. brew install reattach-to-user-namespace --wrap-pbcopy-pbpaste && brew link reattach-to-user-namespace
	# 5. Install iTerm2
	# 6. In iTerm2 preferences for your profile set:
	# Character Encoding: Unicode (UTF-8)
	# Report Terminal Type: xterm-256color
	# 7. Put itunesartist and itunestrack into PATH