Question

Write a Python function first_chars that takes one parameter, which is a nested list of strings....

Write a Python function first_chars that takes one parameter, which is a nested list of strings. It returns a string containing the first character of all of the non-empty strings (at whatever depth they occur in the nested list) concatenated together. Here are a couple of examples of how the function should behave when you're done:

>>> first_chars(['Boo', 'is', 'happy', 'today']) 'Biht'

>>>first_chars(['boo', 'was', ['sleeping', 'deeply'], 'that', 'night', ['as', ['usual']]]) 'bwsdtnau'

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Answer #1 
def first_chars(lst):
    result = ""
    for x in lst:
        if type(x)==list:
            result += first_chars(x)
        else:
            result += x[0]
    return result


# Testing
print(first_chars(['Boo', 'is', 'happy', 'today']))
print(first_chars(['boo', 'was', ['sleeping', 'deeply'], 'that', 'night', ['as', ['usual']]]))

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