{"id":510,"date":"2024-11-18T04:01:55","date_gmt":"2024-11-18T04:01:55","guid":{"rendered":"https:\/\/techkubo.com\/python\/?p=510"},"modified":"2025-06-21T16:44:14","modified_gmt":"2025-06-21T16:44:14","slug":"python-lists","status":"publish","type":"post","link":"https:\/\/techkubo.com\/python\/python-lists\/","title":{"rendered":"Python Lists"},"content":{"rendered":"\n

Lists are ordered, mutable collections of items. They are one of the most commonly used data types in Python for storing sequences of elements. Lists can contain items of different data types.<\/p>\n\n\n\n

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Creating Lists<\/h2>\n\n\n\n

You can create a list by placing comma-separated values inside square brackets.<\/p>\n\n\n\n

Lists can store multiple items in a single variable. They can include different data types such as strings, integers, floats, and even other lists.<\/p>\n\n\n\n

# Creating a list of strings\nfruits = ["apple", "banana", "cherry"]\n\n# Creating a list of integers\nnumbers = [1, 2, 3, 4, 5]\n\n# Creating a list with mixed data types\nmixed_list = [1, "Hello", 3.14, True]<\/pre><\/div>\n\n\n\n
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Accessing List Items<\/h2>\n\n\n\n
You can access individual items in a list using indexing. Python uses zero-based indexing.<\/p>\n\n\n\n
The index 0<\/code> accesses the first item in the list, while the index -1<\/code> accesses the last item.<\/p>\n\n\n\n
# Accessing list items\nprint(fruits[0])  # Output: apple\nprint(fruits[-1]) # Output: cherry<\/pre><\/div>\n\n\n\n
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Modifying List Items<\/h2>\n\n\n\n
Lists are mutable, meaning you can change their items after creation.<\/p>\n\n\n\n
You can modify items by accessing them using their index.<\/p>\n\n\n\n
# Modifying list items\nfruits[1] = "blueberry"\nprint(fruits)  # Output: ['apple', 'blueberry', 'cherry']<\/pre><\/div>\n\n\n\n
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Adding Items to a List<\/h2>\n\n\n\n
You can add items to a list using the append()<\/code> method, insert()<\/code> method, or the extend()<\/code> method.<\/p>\n\n\n\n
    \n
  • append()<\/code> adds an item to the end of the list.<\/li>\n\n\n\n
  • insert()<\/code> adds an item at a specified position.<\/li>\n\n\n\n
  • extend()<\/code> adds multiple items to the end of the list.<\/li>\n<\/ul>\n\n\n\n
    # Adding items to a list\nfruits.append("orange")\nfruits.insert(1, "kiwi")\nmore_fruits = ["mango", "pineapple"]\nfruits.extend(more_fruits)\nprint(fruits)  # Output: ['apple', 'kiwi', 'blueberry', 'cherry', 'orange', 'mango', 'pineapple']<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Removing Items from a List<\/h2>\n\n\n\n
    You can remove items from a list using the remove()<\/code> method, pop()<\/code> method, or the del<\/code> statement.<\/p>\n\n\n\n
      \n
    • remove()<\/code> removes the first occurrence of a specified value.<\/li>\n\n\n\n
    • pop()<\/code> removes an item at a specified index and returns it.<\/li>\n\n\n\n
    • del<\/code> statement removes an item at a specified index.<\/li>\n<\/ul>\n\n\n\n
      # Removing items from a list\nfruits.remove("kiwi")\nprint(fruits)  # Output: ['apple', 'blueberry', 'cherry', 'orange', 'mango', 'pineapple']\n\nremoved_fruit = fruits.pop(1)\nprint(removed_fruit)  # Output: blueberry\nprint(fruits)  # Output: ['apple', 'cherry', 'orange', 'mango', 'pineapple']\n\ndel fruits[0]\nprint(fruits)  # Output: ['cherry', 'orange', 'mango', 'pineapple']<\/pre><\/div>\n\n\n\n
      <\/p>\n\n\n\n
      List Methods<\/h2>\n\n\n\n
      Python provides several built-in methods for list manipulation.<\/p>\n\n\n\n
        \n
      • len()<\/strong>: Returns the number of items in a list.<\/li>\n\n\n\n
      • sort()<\/strong>: Sorts the items in a list in ascending order.<\/li>\n\n\n\n
      • reverse()<\/strong>: Reverses the order of items in a list.<\/li>\n<\/ul>\n\n\n\n
        # List methods\nprint(len(fruits))  # Output: 4\n\nfruits.sort()\nprint(fruits)  # Output: ['cherry', 'mango', 'orange', 'pineapple']\n\nfruits.reverse()\nprint(fruits)  # Output: ['pineapple', 'orange', 'mango', 'cherry']<\/pre><\/div>\n\n\n\n
        <\/p>\n\n\n\n
        Python Lists Example Code<\/h2>\n\n\n\n
        This program creates a list of fruits and demonstrates adding, modifying, removing items, and using list methods.<\/p>\n\n\n\n
        # Creating a list\nfruits = ["apple", "banana", "cherry"]\n\n# Accessing list items\nprint(fruits[0])  # Output: apple\nprint(fruits[-1]) # Output: cherry\n\n# Modifying list items\nfruits[1] = "blueberry"\nprint(fruits)  # Output: ['apple', 'blueberry', 'cherry']\n\n# Adding items to a list\nfruits.append("orange")\nfruits.insert(1, "kiwi")\nmore_fruits = ["mango", "pineapple"]\nfruits.extend(more_fruits)\nprint(fruits)  # Output: ['apple', 'kiwi', 'blueberry', 'cherry', 'orange', 'mango', 'pineapple']\n\n# Removing items from a list\nfruits.remove("kiwi")\nprint(fruits)  # Output: ['apple', 'blueberry', 'cherry', 'orange', 'mango', 'pineapple']\n\nremoved_fruit = fruits.pop(1)\nprint(removed_fruit)  # Output: blueberry\nprint(fruits)  # Output: ['apple', 'cherry', 'orange', 'mango', 'pineapple']\n\ndel fruits[0]\nprint(fruits)  # Output: ['cherry', 'orange', 'mango', 'pineapple']\n\n# List methods\nprint(len(fruits))  # Output: 4\n\nfruits.sort()\nprint(fruits)  # Output: ['cherry', 'mango', 'orange', 'pineapple']\n\nfruits.reverse()\nprint(fruits)  # Output: ['pineapple', 'orange', 'mango', 'cherry']<\/pre><\/div>\n\n\n\n
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