Learn Python
- Python basic
- Introduction to File Handling
- Basics of List Comprehension
- Introduction to Matplotlib
- Classes and Objects
- Introduction to Functions
- Python Numbers
- Creating Basic Plots
- Opening and closing files
- Function parameters and arguments
- Advanced Techniques
- Attributes and Methods
- Python Strings
- Scope and lifetime of variables
- Advanced Plotting
- Reading from files
- Performance and Limitations
- Encapsulation
- Python List
- Specialized Plots
- Writing to files
- Return statement and output
- Inheritance
- Python Tuple
- Advanced Customization
- Working with different file formats
- Lambda Functions
- Polymorphism
- Python Sets
- File management operations
Python List
Common built-in list methods
These are some of the most frequently used built-in methods that operate on lists in Python. Let's explore what each one does:
- len(list)
This method returns the length (number of elements) of a list. It's a quick way to determine how many items are in your list.
fruits = ["apple", "banana", "cherry"] list_length = len(fruits) print(list_length) # Output: 3
- min(list) and max(list)
These methods find the minimum and maximum elements within a list, respectively. They work with numbers and strings (based on alphabetical order for strings).
numbers = [3, 1, 4, 1, 5]
smallest = min(numbers)
largest = max(numbers)
print("Smallest:", smallest) # Output: Smallest: 1
print("Largest:", largest) # Output: Largest: 5- sort(list)
This method sorts the elements of a list in ascending order (from smallest to largest). It modifies the original list in place.
fruits = ["banana", "cherry", "apple"] fruits.sort() print(fruits) # Output: ["apple", "banana", "cherry"]
- reverse(list)
This method reverses the order of elements in place within the list. Imagine reversing the order of items in your shopping list.
fruits = ["apple", "banana", "cherry"] fruits.reverse() print(fruits) # Output: ["cherry", "banana", "apple"]
Important points to remember
- sort() and reverse() modify the original list. If you want to preserve the original order, consider creating a copy of the list before using these methods.
- min() and max() can work with different data types, but they might not behave as expected if you mix data types within a list.
It's time to take a quiz!
Test your knowledge and see what you've just learned.
What will be the output of the following code: fruits = ["apple", "banana", "cherry"]; list_length = len(fruits); print(list_length)?
A3
B2
C1
D0
Check Answer
What will be the output of the following code: numbers = [3, 1, 4, 1, 5]; print(min(numbers), max(numbers))?
A1 5
B1 4
C3 5
D4 5
Check Answer
What will fruits contain after executing: fruits = ["banana", "cherry", "apple"]; fruits.sort();?
A["banana", "cherry", "apple"]
B["apple", "banana", "cherry"]
C["cherry", "banana", "apple"]
D["apple", "banana", "cherry"]
Check Answer
What will fruits contain after executing: fruits = ["apple", "banana", "cherry"]; fruits.reverse();?
A["cherry", "banana", "apple"]
B["apple", "banana", "cherry"]
C["banana", "cherry", "apple"]
D["banana", "apple", "cherry"]
Check Answer
Which methods modify the original list?
Dmin() and max()
Alen() and max()
Bmin() and len()
Csort() and reverse()
Check Answer