How are array elements accessed?

In Python, there are two ways to access array elements: index-based access, using square brackets [] to specify that the index starts from 0. For traversal access, use a for loop or iterator to traverse all elements.

How to access array elements

An array is a data structure used to store a set of data of the same data type. In Python, you can use square brackets [] to access array elements. The following are two ways to access array elements:

Index-based access

Index-based access is the most commonly used access method. Indexing starts at 0, which represents the first element in the array. The element at a specific index can be accessed through the following syntax:

array[index]

For example:

# 创建一个整数数组
numbers = [1, 2, 3, 4, 5]

# 访问索引为 2 的元素
element = numbers[2]

print(element)  # 输出：3

Traversal access

Traversal access uses for accessing all elements in an array. Array elements can be traversed using a for loop or iterator.

• for loop:

for element in array:
    # 处理元素

• Iterator:

array_iterator = iter(array)
while True:
    try:
        element = next(array_iterator)
        # 处理元素
    except StopIteration:
        break

Practical case

Calculate the sum of all elements in the array

# 创建一个整数数组
numbers = [1, 2, 3, 4, 5]

# 计算元素的总和
total = 0
for number in numbers:
    total += number

print(total)  # 输出：15

The above is the detailed content of How are array elements accessed?. For more information, please follow other related articles on the PHP Chinese website!