Python memoryview with Example

Python memoryview with Example

In Python, memoryview is a simple tool that reveals an object's hidden bytes. It allows you to view an object's raw memory without copying it. This is useful when working with large amounts of data or modifying binary data at a low level. Here's an example of how to use memoryview:

# Create a bytes object
original_bytes = b'Hello, World!'

# Create a memoryview object
memory_view = memoryview(original_bytes)

# Access and modify the underlying bytes using the memoryview
for i in range(len(memory_view)):
    # Convert each character to its ASCII value and increment by 1
    memory_view[i] = memory_view[i] + 1

# Convert the modified memoryview back to bytes
modified_bytes = bytes(memory_view)

# Print the original and modified bytes
print("Original Bytes:", original_bytes)
print("Modified Bytes:", modified_bytes)

In this example, we create a bytes object containing the text 'Hello, World!'. Then, we make a memoryview of the bytes object. We use a loop to add 1 to each byte. Finally, we convert the updated memoryview back to bytes and display the original and modified bytes.

Keep in mind that changing the memoryview affects the original object's bytes. memoryview is useful for working with large datasets because it allows you to handle the data efficiently without creating additional copies.