Python Lists: A Comprehensive Guide with Examples of List Manipulation
Python lists along with code examples for each method:
**Python Lists:**
- Lists are a collection of items that are ordered and mutable, meaning you can change, add, or remove elements.
**Creating a List:**
```python
# Empty list
empty_list = []
# List with elements
numbers = [1, 2, 3, 4, 5]
fruits = ['apple', 'banana', 'orange']
```
**Accessing Elements:**
```python
numbers = [1, 2, 3, 4, 5]
print(numbers[0]) # Output: 1
print(numbers[2]) # Output: 3
print(numbers[-1]) # Output: 5 (last element)
```
**Slicing Lists:**
```python
numbers = [1, 2, 3, 4, 5]
print(numbers[1:4]) # Output: [2, 3, 4]
print(numbers[:3]) # Output: [1, 2, 3]
print(numbers[2:]) # Output: [3, 4, 5]
print(numbers[::2]) # Output: [1, 3, 5] (every second element)
```
**List Length:**
```python
numbers = [1, 2, 3, 4, 5]
length = len(numbers)
print(length) # Output: 5
```
**Adding Elements:**
```python
fruits = ['apple', 'banana', 'orange']
fruits.append('grape') # Add 'grape' at the end
fruits.insert(1, 'kiwi') # Insert 'kiwi' at index 1
print(fruits) # Output: ['apple', 'kiwi', 'banana', 'orange', 'grape']
```
**Removing Elements:**
```python
fruits = ['apple', 'banana', 'orange', 'grape']
fruits.remove('banana') # Remove 'banana'
popped_fruit = fruits.pop() # Remove the last element and get its value
print(fruits) # Output: ['apple', 'orange']
print(popped_fruit) # Output: 'grape'
```
**List Comprehension:**
```python
# Create a new list based on existing list with some modification
numbers = [1, 2, 3, 4, 5]
squared_numbers = [n**2 for n in numbers]
print(squared_numbers) # Output: [1, 4, 9, 16, 25]
```
**Sorting a List:**
```python
numbers = [3, 1, 4, 2, 5]
numbers.sort() # Sort the list in ascending order
print(numbers) # Output: [1, 2, 3, 4, 5]
fruits = ['banana', 'orange', 'apple']
sorted_fruits = sorted(fruits) # Create a new sorted list
print(sorted_fruits) # Output: ['apple', 'banana', 'orange']
```
**Checking Element Existence:**
```python
numbers = [1, 2, 3, 4, 5]
print(3 in numbers) # Output: True
print(6 not in numbers) # Output: True
```
**Clearing a List:**
```python
numbers = [1, 2, 3, 4, 5]
numbers.clear() # Remove all elements from the list
print(numbers) # Output: []
```
Lists are versatile and widely used in Python for storing collections of data. I hope these examples help you understand Python lists better for your tutorial blog! Happy coding!
