dict_keys.py

#!/usr/bin/env python

"""For ctbarna."""

list_of_dicts = [
        {'key_1': 'value_1', 'key_2': 'value_2'},
        {'key_1': {'inception_key': 'inception_value'}, 'key_2': 'value_2'},
        {'key_1': 'value_1', 'key_2': 'value_2'},
]


def print_key(dictionary):
    """For mapping over list of dicts."""
    for key in dictionary:
        if isinstance(dictionary[key], dict):
            print dictionary['key_2']


map(print_key, list_of_dicts)