p2or

import bpy

group_input = {"Group", "Group.001", "Group.002"}
ob = bpy.context.active_object

group_lookup = {g.index: g.name for g in ob.vertex_groups}
group_candidates = {n for n in group_lookup.values() if n in group_input}

# test whether all candidates components of group_lookup
if all(n in group_lookup.values() for n in group_candidates):

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# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

p2or

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

p2or

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

p2or

import bpy

vgroup_A_name = "Group"
vgroup_B_name = "Group.001"

ob = bpy.context.active_object
if vgroup_A_name and vgroup_B_name in ob.vertex_groups:
    
    vgroup = ob.vertex_groups.new(name=vgroup_A_name+"+"+vgroup_B_name)
    

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# for http://blender.stackexchange.com/questions/32787/example-of-creating-and-setting-a-cycles-material-node-with-the-python-api

import bpy

# get the material
mat = bpy.data.materials['Material']
# get the nodes
nodes = mat.node_tree.nodes

# clear all nodes to start clean

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# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

p2or

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

p2or

# 2.8+ Update for https://gist.github.com/sambler/6d1fdee82878811c75ac

import bpy

class CustomMenu(bpy.types.Menu):
    """Demo custom menu"""
    # example menu from Templates->Python->ui_menu.py
    bl_label = "Custom Menu"
    bl_idname = "OBJECT_MT_custom_menu"

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# -*- coding: utf-8 -*-
# DO NOT EDIT THIS FILE
# This file was automatically generated by Natron PyPlug exporter version 10.

# Hand-written code should be added in a separate file named N_FlickerExt.py
# See http://natron.readthedocs.org/en/master/devel/groups.html#adding-hand-written-code-callbacks-etc
# Note that Viewers are never exported

import NatronEngine
import sys