1def contra_dict(expression):
 2    """
 3    Return the appropriate method based on the argument's type,
 4    using a dictionary as an alternative to an if/elif block, the name is pun intended
 5    """
 6    return { bool: the_other_boolean_around, int: the_other_number_around, float: the_other_number_around, str: the_other_string_around }.get(type(expression))(expression)
 7
 8
 9def the_other_boolean_around(expression):
10    """Negate a boolean expression"""
11    return not expression
12
13
14def the_other_number_around(expression):
15    """Negate a number (an int or a float)"""
16    return -expression;
17
18
19def the_other_string_around(expression):
20    """Return a string in reverse order"""
21    return expression[::-1]
22
23
24def no_it_isnt(expressions):
25    """Return a list of the negated expressions in reverse order"""
26    return [contra_dict(expression) for expression in expressions[::-1]]