I will assume that Python3 Version 3.11.3 is used.

base64 is a default module that can be imported right away.
Here is an example code to encode and decode any bytes-like object.

```python
import base64 # How to import the default base64 module

encodedString = base64.b64encode(b"Please encode this string.") # to encode the object, important it needs to be a bytes-like object
print(encodedString)

decodedString = base64.b64decode(encodedString) # to decode the encoded bytes-like object
print(decodedString)
```

The output should be:
```python
b'UGxlYXNlIGVuY29kZSB0aGlzIHN0cmluZy4='
b'Please encode this string.'
```

Now, it is important that the input for the base64 module needs to be a bytes-like object.
The base64 expects the data to be bytes-like object, which is designed to encode bytes-like object, because it is easier to encode files and streams of data this way, as you can see with the previous example.

This is why the string is converted to bytes with ```b"any text"```.`
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