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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 _token_at_col_in_line(line, column, token, token_len=None):
 """True if token is at column."""

    if not token_len:
        token_len = len(token)

    remaining_len = len(line) - column

    return (remaining_len >= token_len and
            line[column:column + token_len] == token)