Question

1. suppose d = {\peter\:46, \john\:56}, what happens when retrieving a value using d\juan\?

since \juan\ is not a key in the set, python raises a syntax error.
since \juan\ is not a key in the set, python raises a keyerror exception.
since \juan\ is not a value in the set, python raises a keyerror exception.
it is executed fine, no exception is raised, and it returns none.

1. which of the following is a python tuple?

(1, 2, 3)
{}
{1, 2, 3}
1, 2, 3

1. suppose d1 = {\kevin\:31, \anthony\:34} and d2 = {\kevin\:376, \anthony\:34}, d1 > d2 will return

true
an error message
false

Explanation:

1. In Python, when trying to access a non - existent key in a dictionary, a KeyError exception is raised. "juan" is not a key in the given dictionary d.
2. In Python, tuples are enclosed in parentheses. (1, 2, 3) is a tuple, {} is an empty dictionary, {1, 2, 3} is a set, and [1, 2, 3] is a list.
3. Dictionaries in Python do not support direct comparison using the > operator. This will raise an error message.

Answer:

1. Since "juan" is not a key in the set, Python raises a KeyError exception.
2. (1, 2, 3)
3. An error message