How to Convert Bytes to Integers Seamlessly?

Understanding the Conversion from Bytes to Integers

While working on an encryption/decryption program, you face the need to convert bytes to integers. It's crucial to recognize that the inverse of bytes([3]) = b'x03' isn't immediately clear. Let's delve deeper into the solution to this conversion issue.

Python 3.2 introduced an intuitive function for this conversion: int.from_bytes. This function requires three parameters:

• bytes: A bytes-like object or an iterable that generates bytes.
• byteorder: Specifies the byte order as either "big" (most significant byte first) or "little" (most significant byte last).
• signed: Indicates whether the integer uses two's complement representation.

Here are some examples to illustrate the usage:

<code class="python">int.from_bytes(b'\x00\x01', "big")       # 1
int.from_bytes(b'\x00\x01', "little")    # 256

int.from_bytes(b'\x00\x10', byteorder='little')  # 4096
int.from_bytes(b'\xfc\x00', byteorder='big', signed=True)  # -1024</code>

By leveraging the int.from_bytes function, you can efficiently convert bytes to integers with the desired byte order and signedness. This functionality greatly simplifies your encryption/decryption program's handling of bytes and integers.

The above is the detailed content of How to Convert Bytes to Integers Seamlessly?. For more information, please follow other related articles on the PHP Chinese website!