Changing the open with settings in 10.10.1

I am looking for a way to edit the open with settings in 10.10.1, i have looked through older questions and have attempted to rename the launch services plist and have gotten no where.

Here is a picture to clarify, i would like to remove numbers.app and pages.app along with xcode.app as options to open up files with a .py extension.

Note: i can not upload images so here is a link to imgur

http://ift.tt/1rapYl1

Update: I have looked through the /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister and my /Users/J/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist and i was able to remove text edit from random extensions but i am still unable to remove numbers or find its assoisation to .py files in a /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister - dump