python b64decode.decode

`b64decode` is a method in the `base64` module in Python. It is used to decode a Base64 encoded string back into its original form.

Here's an example of how you can use it:

import base64

encoded_string = "SGVsbG8gV29ybGQh"  # Base64 encoded string
decoded_bytes = base64.b64decode(encoded_string)  # Decode the string
decoded_string = decoded_bytes.decode('utf-8')  # Convert bytes to string

print(decoded_string)  # Output: "Hello World!"

In the above example, the `b64decode` function decodes the `encoded_string` variable, which contains a Base64 encoded string, into bytes. The `decode` method is then used to convert those bytes back into a string using the 'utf-8' encoding. The resulting decoded string is then printed.