hasattr_and_setattr.py

class Programmer(object):
    def __init__(self):
        self.username = None
        self.language = None
        self.operating_system = None
        self.most_used_language=None
        self.loves_coffee = None
        self.twitter_handle = None

data = {
    "username" : "supercode",
    "language" : "Python",
    "operating_system" : "Ubuntu",
    "most_used_language" : "Python",
    "loves_coffee" : True,
    "twitter_handle" : "iamsupercode"
}

programmer = Programmer()

for key, value in data.items():
    if hasattr(programmer, key):
        setattr(programmer, key, value)

# the other way of doing it in one line
[setattr(programmer, key, value) for key,value in data.items() if hasattr(programmer, key)]