Lists

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A List is an ordered sequence that is mutable and can contain elements of different data types. Key characteristics: - Elements enclosed in square brackets [ ] - Elements separated by commas - Mutable

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Elements are accessed using square brackets with index positions: - Positive indexing starts from 0 - Negative indexing starts from -1 (last element) Example: list1 = ['Red', 'Green', 'Blue', 'Yellow

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Lists are mutable because their contents can be changed after creation. You can modify, add, or remove elements. Example: list1 = ['Red', 'Green', 'Blue'] list1[1] = 'Yellow' # Modify second element

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Concatenation joins two lists using the + operator: Example: list1 = [1, 3, 5] list2 = [2, 4, 6] result = list1 + list2 print(result) # [1, 3, 5, 2, 4, 6] Important: Original lists remain unchanged

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The * operator replicates a list a specified number of times: Example: list1 = ['Hello', 'World'] result = list1 * 3 print(result) # ['Hello', 'World', 'Hello', 'World', 'Hello', 'World'] Syntax: l

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Membership operators check if an element exists in a list: 'in' operator: list1 = ['Red', 'Green', 'Blue'] print('Green' in list1) # True print('Yellow' in list1) # False 'not in' operator: print(

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Slicing extracts a portion of a list using [start:end:step] syntax: Basic slicing: list1 = ['A', 'B', 'C', 'D', 'E'] - list1[1:4] → ['B', 'C', 'D'] - list1[:3] → ['A', 'B', 'C'] - list1[2:] → ['C', '

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Method 1 - Direct iteration: list1 = ['Red', 'Green', 'Blue'] for item in list1: print(item) Method 2 - Using range() and len(): for i in range(len(list1)): print(list1[i]) Both methods prod