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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_kwic(tokens, index, context_window=5):
 """ keyword in context Parameters tokens : list of str a text represented as a list of tokens index : int the index of the keyword in the token list context_window : int the number of preceding/succeding words of the keyword to be retrieved Returns ------- before : list of str the tokens preceding the keyword keyword : str the token at the index position after : list of str the tokens succeding the keyword """

    text_length = len(tokens)
    start_before = max(0, index-context_window)
    end_before = max(0, index)
    before = tokens[start_before:end_before]
    start_after = min(text_length, index+1)
    end_after = min(text_length, index+context_window+1)
    after = tokens[start_after:end_after]
    return before, tokens[index], after