Working with Lists

A list is an ordered collection of items. Instead of creating separate variables for each stock in a portfolio, you can store them all in a single list.

Creating Lists

Accessing List Elements

Lists are indexed starting from 0 (the first item is at position 0):

Modifying Lists

Lists are mutable - you can change their contents:

Useful List Operations

List Slicing

Extract portions of a list:

Sorting Lists

Practice: Portfolio Analysis

Practice: Calculate Portfolio Value

Key Takeaways

• Lists store ordered collections of items
• Access elements with [index], starting from 0
• Negative indices count from the end: [-1] is the last item
• Use append() to add items, remove() to delete
• len(), sum(), max(), min() work on lists
• Slice with [start:end] to extract portions
• sorted() creates a sorted copy, .sort() modifies in place

Next, we'll learn about dictionaries - storing data with meaningful labels like ticker symbols!