merging sublist into single list in python

[scidam]

@snippsat, unfortunately the OP has mixture of strings and nested lists of strings [ 'New', ['Group Name Details'], ['Group Name'], ...], so invoking line.split(), when line is a list, will lead to an error. I rewrite my solution to be more pythonic:

def extract_words(mixture):
    """Extract words from mixture of words and lists of words.
    """

    result = list()
    for item in mixture:
        if isinstance(item, list):
            for _astring in item:
                result += _astring.split()
        else:
            result += item.split()
    return result