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Introduction to Python

  • Profound Academy

    • Status
      • 1
        Input and Output
      • 2
        Variables and Integer Arithmetic
      • 3
        Conditional Operators
      • 4
        Advanced Conditions - Nesting
      • 5
        Types and Variables
      • 6
        Strings
      • 7
        Lists
      • 8
        For Loops
      • 9
        While Loops
      • 10
        continue, break, while...else
      • 11
        String and List methods
      • 12
        Nested Loops
      • 13
        List Comprehension
      • 14
        Tuples and Sets
      • 15
        dict
      • 16
        Functions
      • 17
        Functions 2
      • 18
        Lambda and higher-order functions
      • 19
        Files

  • list indexing and slicing

    Elements in the list can be accessed with [] brackets. We can slice lists like strings with [] as well:
    l = [77, 0, -1, 4, 2, 1, 5, -2]
    print(l)        # [77, 0, -1, 4, 2, 1, 5, -2]
    print(l[2])     # -1
    print(l[1: 3])  # [0, -1]
    print(l[1: 4])  # [0, -1, 4]
    print(l[1: 5])  # [0, -1, 4, 2]
    print(l[2: 3])  # [-1]
    print(l[:2])    # [77, 0]
    print(l[2:])    # [-1, 4, 2, 1, 5, -2]

    Challenge

    Declare a variable called alphabet that keeps all the uppercase letters of the English language: alphabet = ['A', 'B', ..., 'Z']. The input contains a single integer n. The program should print the first n letters in the alphabet. It’s guaranteed that 1 ≤ n ≤ 26.
    Input
    Output
    1
    ['A']
    2
    ['A', 'B']
     
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