Modifying Elements

Since lists in Python are zero-indexed, meaning the first element is at index 0, the second at index 1, etc, here, aList[1] refers to the second element, which is 'banana'. This line updates that element to 'kiwi'.

# Python

aList = ['apple', 'banana', 'cherry']
aList[1] = 'kiwi'  # Change 'banana' to 'kiwi'
print(aList)  # Output: ['apple', 'kiwi', 'cherry']

Here, the index is set to 2, which corresponds to the third element of the array, 'cherry'. Then, the value is updated at the specified index (2) from 'cherry' to 'kiwi'.

%%js
// Javascript

let alist = ['apple', 'banana', 'cherry', 'grape'];

// Specify the index you want to update
let index = 2; // For example, to update 'cherry'

// Update the value at the specified index
alist[index] = 'kiwi'; // Now 'cherry' is replaced with 'kiwi'

console.log(alist); // Output: ['apple', 'banana', 'kiwi', 'grape']

Checking Length

The len() function is a built-in Python function that returns the number of items in an object, in this case, the list aList. Since aList contains four elements, len(aList) will return 4. This value is then stored in the variable number_of_elements.

# Python

aList = ['apple', 'banana', 'kiwi', 'grape']
number_of_elements = len(aList)  # Gets the number of elements
print(number_of_elements)  # Output: 4

The .length property of the list is used to determine the number of items in aList.

%%js
// Javascript

let aList = ['apple', 'banana', 'kiwi', 'grape'];
let numberOfElements = aList.length; // Gets the number of elements
console.log(numberOfElements); // Output: 4

Iterating through a List

Iterating a list means going through each element of the list one by one, allowing you to perform operations or access the elements sequentially. This line starts a for loop that iterates over each element in the fruit list. The variable fruit will take on the value of each element in the list, one at a time.

# Python

aList = ['apple', 'banana', 'cherry']
for fruit in aList:
    print(fruit) # Output: apple, banana, cherry

%%js
// Javascript

let aList = ['apple', 'banana', 'cherry'];


for (let fruit of aList) {
   // Replace this comment with your block of statements
   console.log(fruit); // Example statement
}

Popcorn Hack

  • Try changing one of your elements into something new