Dictionaries and Sets

Dictionaries and Sets

Dictionaries:

1. Introduction to Dictionaries:

• Understanding dictionaries as key-value pairs.
• Use cases for dictionaries: storing related information.

2. Creating Dictionaries:

• Defining dictionaries using curly braces {}.
• Adding key-value pairs using colons :.

3. Accessing Dictionary Values:

• Retrieving values using keys.
• Handling missing keys using dict.get().

4. Modifying Dictionaries:

• Changing values associated with keys.
• Adding new key-value pairs.
• Removing key-value pairs using del or dict.pop().

5. Dictionary Methods:

• Using .keys(), .values(), and .items() methods.
• Converting keys, values, or items to lists.

6. Iterating Over Dictionaries:

• Using loops to iterate through keys, values, or items.
• Applying operations to dictionary elements.

7. Checking Key Existence:

• Using in and not in to check key existence.
• Avoiding KeyError using .get() method.

8. Dictionary Comprehensions:

• Creating dictionaries using dictionary comprehensions.
• Applying expressions to generate key-value pairs.

9. Nested Dictionaries:

• Creating dictionaries with values as dictionaries.
• Accessing nested dictionary values.

10. Copying Dictionaries:

• Creating shallow and deep copies of dictionaries.
• Understanding the implications of copying.

Sets:

1. Introduction to Sets:

• Understanding sets as unordered collections of unique elements.
• Use cases for sets: removing duplicates, membership tests.

2. Creating Sets:

• Defining sets using curly braces {}.
• Adding elements to sets using .add().

3. Adding and Removing Elements:

• Using .add() to add a single element.
• Using .update() to add multiple elements.
• Using .remove() and .discard() to remove elements.

4. Set Methods:

• Using .union(), .intersection(), and .difference() methods.
• Performing set operations.

5. Checking Membership:

• Using in and not in to check element existence.
• Testing for intersection with .isdisjoint().

6. Set Comprehensions:

• Creating sets using set comprehensions.
• Generating sets from iterables.

7. Iterating Over Sets:

• Using loops to iterate through set elements.
• Performing operations on set elements.

8. Frozen Sets:

• Creating immutable sets using frozenset().
• Using frozen sets as dictionary keys.

9. Set Operations:

• Understanding mathematical set operations.
• Union, intersection, difference, symmetric difference.

10. Converting Lists to Sets and Vice Versa:

• Using set() to convert lists to sets.
• Using list() to convert sets to lists.