def stretch(self, scale_factor, callback=True):
        self.scale_pct *= scale_factor
        self.scale_and_shift(self.scale_pct, 0.0, callback=callback)
Generic function find a user by it's username or email
dataset/ETHPy150Open ejeschke/ginga/ginga/RGBMap.py/RGBMapper.stretch--crossover with--dataset/ETHPy150Open dpgaspar/Flask-AppBuilder/flask_appbuilder/security/manager.py/BaseSecurityManager.find_user