get_attributes.py

"""
Get both a and b attributes, here 0 is a valid value.
Don't use comparison==0

What if c = '', its invalid!
"""


class A(object):
    a = 1
    b = 0
    c = ''
    d = None

a_obj = A()
a_list = ['a', 'b', 'c', 'd']

if __name__ == '__main__':
    filtered_list = filter(lambda x: getattr(a_obj, x, None) is not None, a_list)
    print filtered_list # ['a', 'b', 'c']

@srinivas-adivi

• 0 is valid, i.e if a = 0 then its Boolean value must return True. Thus it must be included in the filtered list
• '' is invalid, i.e if a = '' then its Boolean value must return False. Thus it shouldn't be included in the filtered list.
• Hope I made it clear

Thank you