Monday 27 November 2023

State whether the following statements are True or False for Python Dictionaries

 a. Dictionary elements can be accessed using position-based index.

Answer

False

b. Dictionaries are immutable.

Answer

False

c. Insertion order is preserved by a dictionary.

Answer

False

d. The very first key - value pair in a dictionary d can be accessed using the

expression d[0].

Answer

False

e. courses.clear( ) will delete the dictionary object called courses.

Answer

False

f. It is possible to nest dictionaries.

Answer

True

g. It is possible to hold multiple values against a key in a dictionary.

Answer

True


Let's go through each statement one by one:


a. Dictionary elements can be accessed using position-based index.

Answer: False

Explanation: Dictionary elements are accessed using keys, not position-based indices. You use the key to retrieve the associated value.

b. Dictionaries are immutable.

Answer: False

Explanation: Dictionaries are mutable, meaning you can modify their content by adding, removing, or updating key-value pairs.

c. Insertion order is preserved by a dictionary.

Answer: False

Explanation: Prior to Python 3.7, dictionaries did not guarantee order preservation. However, starting from Python 3.7, the insertion order is guaranteed to be preserved.

d. The very first key-value pair in a dictionary d can be accessed using the expression d[0].

Answer: False

Explanation: Dictionary elements are not accessed by numerical indices but by keys. There is no guarantee that the keys are numerical, so attempting to access d[0] would not necessarily give you the first key-value pair.

e. courses.clear() will delete the dictionary object called courses.

Answer: False

Explanation: courses.clear() will remove all items from the dictionary called courses, but the dictionary object itself still exists.

f. It is possible to nest dictionaries.

Answer: True

Explanation: Yes, it is possible to have dictionaries as values within another dictionary, creating nested or hierarchical structures.

g. It is possible to hold multiple values against a key in a dictionary.

Answer: True

Explanation: Yes, a key in a dictionary can have a list, tuple, set, or another dictionary as its associated value, allowing you to store multiple values against a single key.


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